Test equipment robotic centrifuges

Hettich Rotanta 46 RSC: troubleshooting and error codes

The ServiceForge knowledge base holds 76 documented symptoms for the Hettich Rotanta 46 RSC, with 209 ranked causes, 106 diagnostic checks with test points and expected values, and 105 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Imbalance on motor axle caution

Centrifuge slows down until lid release occurs; further cooling continues to SET temperature

Ranked causes

1. Weight difference in rotor components (common)
2. Supporting lugs not lubricated (occasional)
3. Wrong IMBALANCE MODE set (occasional)
4. Imbalance switch S1 not connected (occasional)
5. Imbalance switch S1 defective (occasional)
6. Loose contact in cable or plug (occasional)
7. Flat ribbon cable to control panel defective (occasional)
8. Control panel or supply board defective (occasional)

Hatch drive motor timeout closing hatch caution

Hatch drive motor activated but did not fully close hatch within 30 seconds. Hatch end switch must report 'closed' within timeout. Further operation is not possible.

Ranked causes

1. Hatch end switch (S7) defective (common)
2. Hatch drive motor (M6) defective (occasional)
3. Loose connection at hatch drive motor plug (M6) (occasional)
4. Fuse F1 on positioning board (A14) blown (occasional)
5. Defective positioning board (A14) (occasional)
6. Flat ribbon cable to control panel (A5) defective (occasional)
7. Defective control panel (A5) (occasional)

First check

Measure voltage at hatch end switch (S7)

Test point: Positioning board (A14) measuring point MP1
Expected: Voltage change when hatch closes

1 more check with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Hatch drive motor timeout opening hatch caution

Hatch drive motor activated but did not fully open hatch within 30 seconds. Hatch end switch must report 'opened' within timeout. Further operation is not possible.

Ranked causes

1. Hatch end switch (S6) defective (common)
2. Hatch drive motor (M6) defective (occasional)
3. Loose connection at hatch drive motor plug (M6) (occasional)
4. Fuse F1 on positioning board (A14) blown (occasional)
5. Defective positioning board (A14) (occasional)
6. Flat ribbon cable to control panel (A5) defective (occasional)
7. Defective control panel (A5) (occasional)

First check

Measure voltage at hatch end switch (S6)

Test point: Positioning board (A14) measuring point MP2
Expected: Voltage change when hatch opens

1 more check with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No speedometer pulses after start command caution

Rotor slows down and stops after start; DC braking for 30 sec then release lid; further cooling continues

Ranked causes

1. Start implemented without rotor (common)
2. Motor not connected (occasional)
3. Motor defective (occasional)
4. Speed sensor defective or loose contact in plug (common)
5. Flat ribbon cable to control panel or frequency converter defective (occasional)
6. No enable signal at frequency converter (occasional)
7. Supply board, control panel, or frequency converter defective (occasional)

First check

Verify rotor installed before start

Test point: Rotor presence
Expected: Rotor present

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Position 1-4 not reached within 80 seconds

Rotor turns and speedometer pulses occur, but control panel does not recognize desired position within 80 seconds. Positioning information not plausible on tracks A or B, or brake defective. Further operation is not possible.

Ranked causes

1. Defective incremental encoder (B7) (common)
2. Loose connection at incremental encoder plug (B7) (common)
3. Fuse F1 on positioning board (A14) blown (occasional)
4. Magnetic brake (Y2) defective (occasional)
5. Defective positioning board (A14) (occasional)
6. Defective electronic interface/positioning (A5.1) (occasional)
7. Defective control panel (A5) (occasional)

First check

Measure encoder signals with oscilloscope

Test point: Electronic interface/positioning (A5.1) at encoder plug X3: CH A (pin 4, green wire), CH B (pin 5, yellow wire), GND (pi
Expected: 5 V signals shifted 90 degrees on Channels A and B
Tools: Oscilloscope with 2V/DIV sensitivity

1 more check with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Insufficient speed - motor slippage too large

Motor slippage exceeds control adjustment limit of 5%. Rotor speed (ACTUAL) is lower than SET speed minus 5%. Centrifuge slows down and cooling continues.

Ranked causes

1. Motor not running smoothly due to bearing damage (common)
2. Motor defective (occasional)
3. Motor has short-circuited coil (occasional)
4. Loose contact in electrical connections (occasional)
5. Frequency converter (A2) defective (occasional)
6. Enable signal to frequency converter interrupted during centrifugation (rare)

First check

Open lid and perform mains reset

Test point: Motor power and control panel
Expected: System reinitializes; error clears if motor operates normally

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Serial I/O - no connection between control panel and frequency converter

Control panel has no connection to frequency converter via serial interface. Centrifuge slows down and continues cooling.

Ranked causes

1. Flat ribbon cable to frequency converter (A2) defective (common)
2. No voltage at frequency converter (A2) (occasional)
3. Overtemperature switch (F2) on brake resistor opened or not connected (occasional)
4. Overtemperature fuse (F5) blown or not connected (external braking chopper only) (occasional)
5. Supply board, control panel, or frequency converter defective (occasional)
6. Plug X5 on frequency converter not plugged or mispositioned (occasional)

First check

Perform mains reset

Test point: Frequency converter serial connection
Expected: Communication restored; error clears

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Overspeed detected caution

Speed sensor detects speed 250 RPM higher than maximum rotor speed; centrifuge slows and stops; further cooling continues

Ranked causes

1. Speed sensor cable insulation defective (occasional)
2. Loose contact in speed sensor cable (occasional)
3. Speed sensor defective (common)
4. Flat ribbon cable to control panel defective (occasional)
5. Control panel, frequency converter, or supply board defective (occasional)

Overtemperature in condenser caution

Temperature in condenser exceeds 58 °C. Centrifuge slows down and cooling switches off.

Ranked causes

1. Condenser dirty (common)
2. Ventilator defective (occasional)
3. Cable of temperature sensor on condenser (T3) defective (occasional)
4. Loose contact in condenser sensor plug (occasional)
5. Supply board (A1) defective (occasional)

First check

Measure voltage at temperature sensor (T3) on supply board (A1) at plug X1 pins 1-2

Test point: Supply board (A1) plug X1 (with plug X1 inserted), pins 1 and 2
Expected: 2.98 V at 25 °C or 3.31 V at 58 °C, +/- 20 mV

1 more check with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Frequency converter overtemperature caution

Frequency converter switches off automatically, rotor slows down unbraked, further operation not possible, cooling continues until set value achieved.

Ranked causes

1. Insufficient heat transfer from frequency converter to housing (common)
2. Full load operation at high ambient temperature (occasional)
3. Flat ribbon cable defective (occasional)
4. Supply board (A1) or frequency converter (A2) defective (rare)

First check

Carry out MAINS RESET

Test point: Mains switch
Expected: Error code cleared

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Incremental encoder - positioning information missing on tracks A or B

Rotor turns and speedometer pulses occur, but control panel does not recognize encoder pulses within two rounds. Tracks -A- and/or -B- defective or Track N disadjusted. Further operation is not possible.

Ranked causes

1. Defective incremental encoder (B7) (common)
2. Loose connection at incremental encoder plug (B7) (common)
3. Defective electronic interface/positioning (A5.1) (occasional)
4. Defective control panel (A5) (occasional)

First check

Measure encoder signals with oscilloscope

Test point: Electronic interface/positioning (A5.1) at encoder plug X3: CH A (pin 4, green wire), CH B (pin 5, yellow wire), GND (pi
Expected: 5 V signals shifted 90 degrees on Channels A and B
Tools: Oscilloscope with 2V/DIV sensitivity; time-base deflection depends on speed

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Incremental encoder - Track N (zero pulse) missing or defective

Rotor turns and speedometer pulses occur, but control panel does not recognize zero-pulses within two rounds. Track N defective or not connected. Further operation is not possible.

Ranked causes

1. Defective incremental encoder (B7) (common)
2. Loose connection at incremental encoder plug (B7) (common)
3. Defective electronic interface/positioning (A5.1) (occasional)
4. Defective control panel (A5) (occasional)

First check

Measure Track N signal with oscilloscope

Test point: Electronic interface/positioning (A5.1) at encoder plug X3: Track N (pin 6, pink wire), GND (pin 2, white wire)
Expected: Zero pulse appears 1 time per revolution at 5 V
Tools: Oscilloscope with 2V/DIV sensitivity

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Invalid rotor code read during startup

An invalid rotor code was detected during start-up. Centrifuge slows down and cooling continues until SET temperature is reached.

Ranked causes

1. Magnetic code on rotor defective (common)
2. Speedometer system defective (occasional)
3. Loose contact in speed sensor plug (occasional)
4. Motor rotating in wrong direction (rare)

First check

Open lid or perform mains reset

Test point: Control panel
Expected: Error clears and system is ready for restart

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Key-operated switch voltage out of range

Error 57 displayed. Further operation not possible.

Ranked causes

1. Key-operated switch board is defective (occasional)
2. Cable to key-operated switch board is defective (occasional)
3. Loose contact in wire layout (occasional)
4. Supply board A1 is defective (rare)

First check

Measure voltage at supply board A1 plug X27 pins 1-2 for each switch position

Test point: Supply board A1, plug X27, pin 1 - pin 2
Expected: Position 1 (LOCK1) ≈ 1.4 V, Position 2 (LOCK2) ≈ 2.1 V, Position 3 ≈ 3.3 V, Within 0.9 V - 3.8 V range

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Lid lock opened during centrifugation patient safety

Lid lock opens during centrifugation; centrifuge slows and stops; further cooling continues

Ranked causes

1. Lid lock Y1 defective; opens during centrifugation (common)
2. Loose contact in cable or plug (occasional)
3. Flat ribbon cable to control panel defective (occasional)
4. Control panel or supply board defective (occasional)

Motor overtemperature high voltage

Error 67 displayed. Overtemperature switch in motor opens due to high motor temperature. Takes up to 10 minutes to reset. Converter switches off, rotor slows unbraked, cooling continues.

Ranked causes

1. Motor operating temperature too high (common)
2. Plug X4 on frequency converter A2 not plugged or loose contact (occasional)
3. Flat ribbon cable is defective (occasional)
4. Supply board A1 or frequency converter A2 is defective (rare)

First check

Measure voltage at plug X4 on frequency converter A2

Test point: Frequency converter A2, plug X4
Expected: 16 V DC

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Overcurrent in motor circuit high voltage

Error 63 displayed. Frequency converter switches off, rotor slows unbraked, cooling continues.

Ranked causes

1. Short circuit in the motor (occasional)
2. Motor impedance is too low (occasional)
3. Flat ribbon cable is defective (occasional)
4. Supply board A1 or frequency converter A2 is defective (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Serial I/O - frequency converter NAK signal

Frequency converter cannot acknowledge command and sends NAK (no acknowledge) signal to control panel. Centrifuge slows down and continues cooling.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Flat ribbon cable to frequency converter (A2) defective (common)
3. Frequency converter (A2) defective (occasional)
4. Supply board (A1) or control panel (A5) defective (occasional)

First check

Perform mains reset

Test point: Frequency converter response
Expected: Converter acknowledges commands; error clears

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Temperature sensor at bottom of chamber short or open circuit

Error 53 displayed. Centrifuge slows down, cooling system switched off.

Ranked causes

1. Temperature sensor T2 at bottom of chamber is defective (common)
2. Sensor cable is defective (occasional)
3. Loose contact in the plug (occasional)
4. Supply board A1 is defective (rare)

First check

Measure voltage at supply board A1 plug X2 pins 4-5

Test point: Supply board A1, plug X2, pin 4 - pin 5
Expected: 2.98 V (± 20 mV) at 25 °C, ±20 mV

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Temperature sensor at top of chamber short or open circuit

Error 54 displayed. Centrifuge slows down, cooling system switched off.

Ranked causes

1. Temperature sensor T1 at top of chamber is defective (common)
2. Sensor cable is defective (occasional)
3. Loose contact in the plug (occasional)
4. Control panel A5 is defective (rare)

First check

Measure voltage at control panel A5 plug X2 pins 1-2

Test point: Control panel A5, plug X2, pin 1 - pin 2
Expected: 2.50 V = -23 °C to 3.77 V = +104 °C (2.98 V ± 20 mV at 25 °C), ±20 mV

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Temperature sensor on condenser short or open circuit

Error 55 displayed. Centrifuge slows down, cooling system switched off.

Ranked causes

1. Temperature sensor T3 on condenser is defective (common)
2. Sensor cable is defective (occasional)
3. Loose contact in the plug (occasional)
4. Supply board A1 is defective (rare)

First check

Measure voltage at supply board A1 plug X1 pins 1-2

Test point: Supply board A1, plug X1, pin 1 - pin 2
Expected: 2.98 V (± 20 mV) at 25 °C, ±20 mV

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

EEPROM in frequency converter defective caution

Frequency converter switches off automatically, rotor slows down unbraked, further operation not possible, cooling continues until set value achieved.

Ranked causes

1. Flat ribbon cable defective (occasional)
2. Frequency converter (A2) defective (occasional)
3. Supply board (A1) defective (occasional)

First check

Carry out MAINS RESET

Test point: Mains switch
Expected: Error code cleared

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Enable signal not transmitted to frequency converter high voltage

Error 60 displayed. Further operation not possible.

Ranked causes

1. Flat ribbon cable to frequency converter A2 is defective (occasional)
2. Flat ribbon cable to control panel A5 is defective (occasional)
3. Supply board A1 is defective (rare)

First check

Measure voltage at supply board A1 plug X7 pins 1-5

Test point: Supply board A1, plug X7, pin 1 - pin 5
Expected: Lid not locked: 0 V; Lid locked after start: 15 V - 20 V, typical 18 V

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Hatch does not open or close

Drive motor for hatch does not respond to key presses; hatch position not displayed or stuck

Ranked causes

1. End switch not actuated or not detected (common)
2. Incorrect last end position stored in control panel (occasional)
3. Centrifuge not at standstill (occasional)

First check

Verify end switch activation

Test point: Hatch end switches
Expected: Switch actuates when hatch fully open or fully closed

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Incorrect feedback - control panel input signal mismatch

Control panel does not recognize expected signal from components. Centrifuge stops with error message.

Ranked causes

1. Control panel (A5) defective (occasional)
2. Supply board (A1) defective (occasional)
3. Flat ribbon cable between supply board and control panel defective (common)

First check

Perform mains reset

Test point: Control and supply boards
Expected: System reinitializes and error clears

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Initialization displays VERSION - ERROR 12

VERSION - ERROR 12 appears on display after mains supply is switched on

Ranked causes

1. Coding strip jumpers do not match machine and cooling version (common)
2. S-control panel not adjusted to centrifuge (occasional)
3. Frequency converter not adjusted to centrifuge (occasional)

First check

Verify jumper positions on coding strip match machine and cooling version

Test point: Supply board A1 coding strip positions A.0, A.4, A.5
Expected: Jumper A.4 and A.5 plugged for machine version 3; jumper A.0 plugged for cooling version 1

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Mains interruption during centrifugation high voltage

Power failure occurred during centrifugation or mains restored during operation. Centrifuge slows down to allow lid opening, or if rotor has stopped, lid release activates.

Ranked causes

1. Power failure (common)
2. Loose contact in electrical connections (occasional)
3. Flat ribbon cable to control panel (A5) defective (occasional)

First check

Open lid and press START key

Test point: Control panel
Expected: System ready for new cycle or manual operation

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Motor thermal overload protection trip high voltage

Error 65 displayed. I*t switch-off for motor; motor current too high for extended period. Converter switches off, rotor slows unbraked, cooling continues.

Ranked causes

1. Motor impedance too low; winding resistances too low (occasional)
2. Flat ribbon cable is defective (occasional)
3. Supply board A1 or frequency converter A2 is defective (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Overtemperature in centrifuge chamber caution

Temperature in centrifuge chamber exceeds threshold. Centrifuge slows down and cooling switches off.

Ranked causes

1. Overtemperature switch cable defective (common)
2. Loose contact in overtemperature switch plug (occasional)
3. Supply board (A1) defective (occasional)

First check

Measure voltage at overtemperature switch on supply board (A1) at plug X2 pins 1-2

Test point: Supply board (A1) plug X2 (with plug X2 inserted), pins 1 and 2
Expected: 0 V if switch closed (overtemperature condition) or 18 V if switch open (normal)

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Overvoltage in frequency converter intermediate circuit high voltage

Error 64 displayed. Intermediate circuit voltage > 410 V DC, typically during braking. Converter switches off, rotor slows unbraked, cooling continues.

Ranked causes

1. Braking chopper A3 is defective (occasional)
2. Flat ribbon cable is defective (occasional)
3. Supply board A1 or frequency converter A2 is defective (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Serial I/O - control panel receives incorrect data from frequency converter

Control panel does not receive correct data from frequency converter. Centrifuge slows down and continues cooling.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Flat ribbon cable to frequency converter (A2) defective (common)
3. Supply board (A1), control panel (A5), or frequency converter (A2) defective (occasional)

First check

Perform mains reset

Test point: Frequency converter data lines
Expected: Correct data received; error clears

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Serial I/O - supply board NAK signal

Supply board cannot acknowledge command and sends NAK (no acknowledge) signal to control panel. Centrifuge slows down.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Supply board (A1) defective (occasional)
3. Control panel (A5) or frequency converter (A2) defective (occasional)

First check

Perform mains reset

Test point: Supply board response
Expected: Board acknowledges commands; error clears

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Speedometer pulses break down during rotation caution

Rotor slows down and stops during centrifugation; DC braking for 30 sec after stop; further cooling continues until SET temperature

Ranked causes

1. Speed sensor defective or loose contact in plug (common)
2. Flat ribbon cable to control panel or frequency converter defective (occasional)
3. Supply board, control panel, or frequency converter defective (occasional)

First check

Measure speedometer pulses at supply board

Test point: Plug X5, pin 4 to pin 2
Expected: Present
Tools: Multimeter

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Supply voltage lower than 205 V AC high voltage

Error 62 displayed. Frequency converter switches off, rotor slows unbraked, cooling continues.

Ranked causes

1. Supply voltage is too low (common)
2. Flat ribbon cable is defective (occasional)
3. Supply board A1 or frequency converter A2 is defective (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Temperature deviation too high

Error 58 displayed. Centrifuge slows down, cooling system switched off.

Ranked causes

1. Temperature range is set too low (common)
2. Failure in the cooling system (occasional)
3. Supply board A1 is defective (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Temperature sensor offset compensation needed

Temperature readings from sensors (T1, T2, T3) are inaccurate and require calibration

Ranked causes

1. Temperature sensor replaced (occasional)
2. S-control panel EPROM replaced (occasional)
3. Supply board replaced (occasional)

First check

Measure actual temperature at T1 (top chamber sensor)

Test point: Temperature sensor T1 at top of centrifuge chamber
Expected: Actual temperature matches sensor display within tolerance
Tools: Thermometer or temperature measuring device

3 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Version mismatch in initialization

Differences detected in initialization between supply board jumper settings, control panel EPROM, or frequency converter. Further operation is not possible.

Ranked causes

1. Incorrect jumper assignment (A.0-A.7) on supply board coding strip (common)
2. Wrong EPROM plugged in control panel (occasional)
3. Supply board (A1) defective (occasional)

First check

Perform mains reset

Test point: Power supply and control panel
Expected: System initializes with correct version parameters

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Rotor position 1 programming and storage

Software teaching procedure to establish rotor position 1 (bucket 1 under hatch) after incremental encoder or motor replacement

Ranked causes

1. Incorrect rotor position 1 stored in control panel (common)
2. Position 1 outside valid programming range (occasional)

First check

Verify zero position reached (position N)

Test point: Control panel and rotor position
Expected: Control panel beeps when rotor arm approaches center position

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error in frequency converter computing section high voltage

Error 61 displayed. Frequency converter switches off, rotor slows unbraked, cooling continues.

Ranked causes

1. Flat ribbon cable is defective (occasional)
2. Supply board A1 or frequency converter A2 is defective (occasional)

First check

Check for red LED flashing on frequency converter A2

Test point: Frequency converter A2 red LED
Expected: LED flashing indicates error in frequency converter

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error in program flow: impermissible operating state caution

Further operation is not possible.

Ranked causes

1. Impermissible operating state determined (occasional)
2. S-control panel (A5) defective (common)

First check

Carry out MAINS RESET

Test point: Mains switch
Expected: Error code cleared

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error in program flow: Watchdog hardware error caution

Further operation is not possible.

Ranked causes

1. Incorrect program flow with program interruption (occasional)
2. S-control panel (A5) defective (common)

First check

Carry out MAINS RESET

Test point: Mains switch
Expected: Error code cleared

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Frequency converter thermal overload protection trip high voltage

Error 66 displayed. I*t switch-off of frequency converter. Converter switches off, rotor slows unbraked, cooling continues.

Ranked causes

1. Flat ribbon cable is defective (occasional)
2. Supply board A1 or frequency converter A2 is defective (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Lid lock message mismatch - control closed, supply open

Control panel indicates lid lock closed while supply board indicates lid lock open. Centrifuge slows down and cooling system switches off.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Supply board (A1) or control panel (A5) defective (occasional)

First check

Perform mains reset

Test point: Power supply
Expected: System reinitializes and error clears

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Lid lock message mismatch - control open, supply closed

Control panel indicates lid lock open while supply board indicates lid lock closed. Centrifuge slows down and continues cooling.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Control panel (A5) or supply board (A1) defective (occasional)

First check

Perform mains reset

Test point: Power supply
Expected: System reinitializes and error clears

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low battery voltage (BATT warning) caution

BATT displayed and flashes during standstill. Centrifuge can operate for at least two weeks after warning. If voltage continues to fall, RAM data may become invalid and CONTROL - ERROR 92 appears on next power-on.

Ranked causes

1. Battery not connected (common)
2. Battery voltage too low (< 2.2 V) (common)

First check

Measure battery voltage at processor connection

Test point: Battery terminals
Expected: ≥ 2.2 V, >= 2.2 V
Tools: Voltmeter or DMM

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Memory difference between RAM and EEPROM caution

BATT flashes on display. Battery not connected or empty, or S-control panel defective.

Ranked causes

1. Battery not connected or empty (common)
2. S-control panel (A5) defective (occasional)

First check

Check if BATT flashes on display

Test point: Display
Expected: BATT flashing or not flashing

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Serial I/O - control panel receives incorrect data from components

Control panel does not receive correct data from supply board and frequency converter. Centrifuge slows down.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Supply board (A1), control panel (A5), or frequency converter (A2) defective (occasional)

First check

Perform mains reset

Test point: Data communication channels
Expected: Correct data received; error clears

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Serial I/O - control panel receives incorrect data from supply board

Control panel does not receive correct data from supply board. Centrifuge slows down.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Supply board (A1) or control panel (A5) defective (occasional)

First check

Perform mains reset

Test point: Supply board data lines
Expected: Correct data received; error clears

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Serial I/O - no connection between control panel and supply board

Control panel has no connection to supply board via serial interface. Centrifuge slows down.

Ranked causes

1. Wrong machine or cooling version set on supply board (A1) (occasional)
2. Supply board (A1) or control panel (A5) defective (occasional)

First check

Perform mains reset

Test point: Serial interface and jumper settings
Expected: Correct version recognized; communication established

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Serial I/O - no connection between control panel and supply board/frequency converter

Control panel has no connection to supply board and frequency converter via serial interface. Centrifuge slows down.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Supply board (A1) or control panel (A5) defective (occasional)

First check

Perform mains reset

Test point: Serial interface
Expected: Communication established; error clears

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Standstill message mismatch - control not standstill, supply standstill

Control panel indicates no standstill while supply board indicates standstill. Centrifuge performs braked slow-down and continues cooling.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Control panel (A5) or supply board (A1) defective (occasional)

First check

Perform mains reset

Test point: Power supply
Expected: System reinitializes and error clears

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Standstill message mismatch - control standstill, supply not

Control panel indicates standstill while supply board indicates no standstill. Centrifuge performs braked slow-down and continues cooling.

Ranked causes

1. Flat ribbon cable to control panel (A5) defective (common)
2. Control panel (A5) or supply board (A1) defective (occasional)

First check

Perform mains reset

Test point: Power supply
Expected: System reinitializes and error clears

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unspecified error (INDEFINITE) caution

Further operation is not possible.

Ranked causes

1. EPROM defective (occasional)
2. S-control panel (A5) defective (occasional)

First check

Carry out MAINS RESET

Test point: Mains switch
Expected: Error code cleared

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery not connected to S-control panel

BATT message displayed on screen

Ranked causes

1. S-control panel battery disconnected (common)

First check

Verify S-control panel battery connected

Test point: S-control panel battery connector
Expected: Battery connected and DIP switch contact 1 closed

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Imbalance mode setup

Configuring imbalance detection mode on supply board and in program

Ranked causes

1. Imbalance mode not configured (rare)

First check

Verify jumper position on plug X8

Test point: Plug X8 pins 3-4
Expected: Jumper installed at factory setting position 3-4

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Incremental encoder zero position (Track N)

Adjustment of zero pulse position after encoder or motor replacement to ensure correct rotor positioning reference

Ranked causes

1. Incremental encoder not properly positioned after installation (common)

First check

Rotate rotor by hand to detect zero position

Test point: Rotor and encoder output
Expected: Control panel buzzer activates at zero position (Track N)

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Leading time

Setting pre-cooling activation time before end of centrifugation to prevent sample undercooling

Ranked causes

1. Leading time not configured for low-speed or extended run conditions (occasional)

First check

Display current leading time setting

Test point: Display screen after PROG key
Expected: LEADING TIME / S <value> (0 = off)

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Temperature average time

Setting delay before actual temperature display during centrifugation startup

Ranked causes

1. Temperature average time not set to desired value (rare)

First check

Check current temperature average time setting

Test point: Display screen after PROG key
Expected: TEMP.AVERAGE <value> shown (preset 30 seconds)

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Temperature offset correction

Correcting temperature sensor readings when sample temperature deviates from set value during centrifugation runs

Ranked causes

1. Temperature sensor reading incorrect (common)

First check

Measure actual temperature at each temperature sensor (T1, T2, T3) with external temperature measuring device

Test point: Temperature sensor location in centrifuge chamber
Expected: Temperature matches displayed set value

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

CONTROL - ERROR 92 displayed during initialization

Short acoustic signal sounds and CONTROL - ERROR 92 appears on display after switching on mains during initialization

Ranked causes

1. Normal functional check during initialization (common)

First check

Wait for functional check completion

Test point: Display during initialization step 2
Expected: CONTROL - ERROR 92 appears, then after 30 seconds VERSION - ERROR 12 or normal initialization sequence follows

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

More symptoms

Entered program speed exceeds rotor maximum
Error code °C / *ERROR 58 temperature deviation after set point reached
Error code °C / *ERROR 58 temperature deviation before set point reached
Error in EEPROM of S-control panel
Error in EPROM of S-control panel
Error in RAM of S-control panel
Functional check after repair
Hardware error in error management of S-control panel
Initialization mode not activated
Lid lock mode not set correctly
Motor slippage check
Optical interface not enabled
Overpressure in cooling system
Positioning mode setup and verification
Program interlock cannot be set via key-operated switch
Test positioning (POS-MENU 4)

16 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`01`	TACHO-ERROR: Speedometer pulses break down during rotation	Speed sensor pulses interrupted during centrifugation	error
`02`	TACHO-ERROR: No speedometer pulses after start command	Control panel receives no speedometer pulses after centrifugation start	error
`03`	IMBALANCE: Imbalance on motor axle detected	Imbalance detected on rotor motor axle	warning
`04`	CONTROL-ERROR: Lid lock opened during centrifugation	Lid lock opens during active centrifugation	error
`05`	N > MAX: Excessive speed detected (250 RPM above rotor max)	Speed sensor detects speed 250 RPM above maximum rotor speed (n-max)	error
`06`	CONTROL-ERROR: Lid lock error; conflicting signals (control panel locked vs supply board unlocked)	Lid lock signal mismatch between control panel and supply board	error
`07`	CONTROL-ERROR: Lid lock error; conflicting signals (control panel unlocked vs supply board locked)	Lid lock signal mismatch between control panel and supply board	error
`08`	CONTROL-ERROR: Standstill error; conflicting signals (control panel standstill vs supply board running)	Standstill signal mismatch between control panel and supply board	error
`09`	CONTROL-ERROR: Standstill error; conflicting signals (control panel running vs supply board standstill)	Standstill signal mismatch between control panel and supply board	error
`10`	ROTORCODE: Invalid rotor code detected	Invalid or unrecognized rotor code	error
`11`	MAINS INTERRUPT: Mains interruption detected	Power supply interrupted during operation	error
`12`	VERSION-ERROR: Error in initialization	Initialization process failure	error
`13`	N < MIN: Speed error; slippage too great	Detected speed below minimum; excessive slippage	error
`26`	CONTROL-ERROR: Incorrect feedback; control panel input does not recognize expected signal	Control panel input signal mismatch	error
`30`	SER I/O-ERROR: No connection between control panel and serial interface	Serial communication failure between control panel and interface	error
`31`	SER I/O-ERROR: No connection between frequency converter and serial interface	Serial communication failure between frequency converter and interface	error
`32`	SER I/O-ERROR: No connection between supply board and serial interface	Serial communication failure between supply board and interface	error
`33`	SER I/O-ERROR: Data incorrectly transmitted from componentry	Data transmission error from internal components	error
`34`	SER I/O-ERROR: Data incorrectly transmitted between control panel and frequency converter	Data transmission error in control-converter link	error
`35`	SER I/O-ERROR: Data incorrectly transmitted between control panel and supply board	Data transmission error in control-board link	error
`36`	SER I/O-ERROR: No acknowledgement (NAK) from frequency converter to control panel	Frequency converter fails to acknowledge control panel command	error
`37`	SER I/O-ERROR: No acknowledgement (NAK) from supply board to control panel	Supply board fails to acknowledge control panel command	error
`40`	POS-ERROR: No positioning information (track A and B defective)	Position tracking system failure; tracks A and B non-functional	error
`41`	POS-ERROR: No positioning information (track N zero-pulse defective)	Zero-pulse positioning signal failure	error
`42`	POS-ERROR: Hatch drive motor needs too much time to close	Hatch closing motor speed or response abnormal	warning
`43`	POS-ERROR: Hatch drive motor needs too much time to open	Hatch opening motor speed or response abnormal	warning
`46`	POS-ERROR: Position 1 to 4 not reached within 80 sec	Drive motor unable to reach target position within timeout	error
`50`	°C / *-ERROR: Overpressure in cooling system detected	Cooling system pressure exceeds safe limit	error
`51`	°C / *-ERROR: Overtemperature on condenser	Condenser temperature exceeds safe limit	error
`52`	°C / *-ERROR: Overtemperature in centrifuge chamber	Chamber temperature exceeds safe limit	error
`53`	°C / *-ERROR: Temperature sensor at bottom of centrifuge chamber defective	Bottom temperature sensor failure or malfunction	error
`54`	°C / *-ERROR: Temperature sensor at top of centrifuge chamber defective	Top temperature sensor failure or malfunction	error
`55`	°C / *-ERROR: Temperature sensor on condenser defective	Condenser temperature sensor failure or malfunction	error
`57`	LOCK-ERROR: Program locking defective	Program lock mechanism failure or malfunction	error
`58`	°C / *-ERROR: Temperature deviation too high	Temperature differs excessively from setpoint	warning
`60`	FU/CCI-ERROR: Faulty release signal to frequency converter	Control signal to frequency converter not transmitted properly	error
`61`	FU/CCI-ERROR: Frequency converter error in computing section	Internal computing/processing error in frequency converter	error
`62`	FU/CCI-ERROR: Frequency converter error; undervoltage	Frequency converter supply voltage below safe operating level	error
`63`	FU/CCI-ERROR: Frequency converter error; overcurrent	Frequency converter output current exceeds safe limit	error
`64`	FU/CCI-ERROR: Frequency converter error; overvoltage	Frequency converter supply voltage exceeds safe limit	error
`65`	FU/CCI-ERROR: Frequency converter error; I²t switch-off for motor	Motor current-time protection activated in frequency converter	error
`66`	FU/CCI-ERROR: Frequency converter error; I²t switch-off of frequency converter	Frequency converter current-time protection activated	error
`67`	FU/CCI-ERROR: Overtemperature in motor (external)	Motor temperature exceeds safe operating limit	error
`68`	FU/CCI-ERROR: Overtemperature in frequency converter	Frequency converter internal temperature exceeds safe limit	error
`69`	FU/CCI-ERROR: Frequency converter EEPROM error	Frequency converter EEPROM memory failure or corruption	error
`90`	CONTROL-ERROR: S-control panel error; EPROM	Control panel EPROM memory failure or corruption	error
`91`	CONTROL-ERROR: S-control panel error; RAM	Control panel RAM memory failure or corruption	error
`92`	CONTROL-ERROR: S-control panel error; EEPROM/RAM difference	Discrepancy between control panel EEPROM and RAM contents	error
`94`	CONTROL-ERROR: S-control panel error; Watchdog	Control panel watchdog timer failure or reset	error
`95`	CONTROL-ERROR: S-control panel error; inadmissible operative state	Control panel in invalid or undefined operating state	error
`96`	N > ROTOR-MAX: Nominal speed higher than permitted rotor speed or RCF	Programmed speed or RCF exceeds rotor specifications	error
`97`	CONTROL-ERROR: S-control panel error; EEPROM	Control panel EEPROM memory failure or corruption	error
`99`	CONTROL-ERROR: S-control panel error; hardware failure in error management	Error management hardware failure in control panel	error
`BATT`	Battery voltage is too low	Battery voltage measured by processor falls below 2.2 V, checked after each MAINS RESET and at 30-minute intervals	warning
`°C / * - ERROR 50`	Overpressure in cooling system	Overpressure switch activated (applies only to units with switch; ROTANTA 46 RSC has pins 2 and 3 jumpered at X11)	error
`°C / * - ERROR 51`	Overtemperature in condenser (> 58 °C)	Condenser temperature exceeds 58 °C threshold	warning
`°C / * - ERROR 52`	Overtemperature in centrifuge chamber	Chamber temperature exceeds threshold as detected by overtemperature switch	warning
`°C / *ERROR 58`	Temperature deviation from set point; either not approaching during warm-up or exceeding tolerance during steady-state centrifugation	1) Temperature moving away from set value during warm-up beyond E58 DIFF threshold; 2) Temperature deviates >120 sec from set value once reached, beyond ERROR TEMPERATUR tolerance	error
`CONTROL - ERROR 06`	Lid lock message faulty - control panel indicates open, supply board indicates closed	Contradictory lid lock signal between control panel and supply board	error
`CONTROL - ERROR 07`	Lid lock message faulty - control panel indicates closed, supply board indicates open	Contradictory lid lock signal between control panel and supply board	error
`CONTROL - ERROR 08`	Standstill message faulty - control panel indicates standstill, supply board does not	Contradictory standstill signal between control panel and supply board	error
`CONTROL - ERROR 09`	Standstill message faulty - control panel indicates no standstill, supply board indicates standstill	Contradictory standstill signal between control panel and supply board	error
`CONTROL - ERROR 26`	Incorrect feedback signal to control panel	Control panel input does not recognize expected signal	error
`CONTROL - ERROR 90`	Error in the EPROM of the S-control panel	EPROM integrity check failure on S-control panel (A5)	critical
`CONTROL - ERROR 91`	Error in the RAM of the S-control panel	RAM read/write failure or RAM integrity check failure on S-control panel (A5)	critical
`CONTROL - ERROR 92`	Difference in the memory areas of RAM and EEPROM	Data mismatch detected between RAM and EEPROM during initialization or operation	error
`CONTROL - ERROR 94`	Error in program flow: Watchdog hardware error in the S-control panel	Program execution interrupted or infinite loop detected by watchdog timer on S-control panel	critical
`CONTROL - ERROR 95`	Error in program flow: impermissible operating state	Operating state determined to be invalid or unsafe on S-control panel	critical
`CONTROL - ERROR 97`	Error in the EEPROM of the S-control panel	EEPROM integrity check failure on S-control panel (A5)	critical
`CONTROL - ERROR 99`	Hardware error in the error management of the S-control panel	Failure in error detection or reporting system on S-control panel (A5)	critical
`ERROR 53`	Temperature sensor at bottom of chamber has short circuit or open circuit.	Voltage < 0.50 V (short circuit) or > 4.50 V (open circuit) at sensor.	error
`ERROR 54`	Temperature sensor at top of chamber has short circuit or open circuit.	Voltage outside permissible range 2.50 V to 3.77 V.	error
`ERROR 55`	Temperature sensor on condenser has short circuit or open circuit.	Voltage < 0.50 V (short circuit) or > 4.50 V (open circuit) at sensor.	error
`ERROR 57`	Voltage from key-operated switch outside permissible range.	Analog voltage at plug X27 outside 0.9 V - 3.8 V range.	critical
`ERROR 58`	Temperature deviation too high.	Measured temperature deviates excessively from set value.	warning
`ERROR 60`	Enable signal not transmitted correctly to frequency converter.	Enable signal not reaching frequency converter after MAINS RESET.	critical
`ERROR 61`	Error in frequency converter computing section.	Internal microprocessor error in frequency converter A2.	critical
`ERROR 62`	Supply voltage lower than 205 V AC.	Mains supply voltage drops below 205 V AC.	warning
`ERROR 63`	Overcurrent in motor circuit.	Motor current exceeds frequency converter limit.	critical
`ERROR 64`	Overvoltage in frequency converter intermediate circuit.	DC voltage in intermediate circuit exceeds 410 V, typically during braking.	critical
`ERROR 65`	Motor thermal overload protection activated (I*t switch-off).	Motor current too high for extended duration.	warning
`ERROR 66`	Frequency converter thermal overload protection activated (I*t switch-off).	Frequency converter internal temperature or current too high for extended duration.	warning
`ERROR 67`	Motor overtemperature.	Motor overtemperature switch opens due to high motor temperature.	warning
`FU / CCI - ERROR 68`	Overtemperature in the frequency converter	Frequency converter temperature exceeds safe operating limit	error
`FU / CCI - ERROR 69`	EEPROM in the frequency converter is defective	EEPROM read/write failure detected during converter operation	error
`INDEFINITE`	Unspecified error (not specified error)	Unknown or unclassified error condition detected	critical
`MAINS INTERRUPT (11)`	Power loss during centrifugation	Electrical power failure or restoration during operation	error
`N < MIN 13`	Insufficient motor speed due to excessive slippage (>5%)	Rotor speed lower than SET speed minus 5%	error
`N < MIN 13`	Rotor speed (ACTUAL speed) is lower than the permitted range of control	During centrifugation run when actual speed drops below minimum threshold	warning
`N > ROTOR - MAX 96`	Error in the entered program; speed or RCF exceeds rotor maximum	User attempts to set speed or RCF higher than rotor specification allows	warning
`POS-ERROR 40`	Incremental encoder missing positioning info on tracks A or B	Defective encoder tracks or missing encoder pulses within two rotor revolutions	critical
`POS-ERROR 41`	Incremental encoder Track N (zero pulse) defective or missing	Zero pulse not recognized within two rotor revolutions	critical
`POS-ERROR 42`	Hatch close motor timeout (exceeds 30 seconds)	Hatch drive motor activated but end switch does not report closed within 30 seconds	critical
`POS-ERROR 43`	Hatch open motor timeout (exceeds 30 seconds)	Hatch drive motor activated but end switch does not report opened within 30 seconds	critical
`POS-ERROR 46`	Rotor does not reach desired position within 80 seconds	Positioning command not completed within timeout; encoder tracks defective or brake not functioning	critical
`ROTOR CODE 10`	Invalid rotor code read during startup	Defective rotor code, defective speedometer, loose sensor plug, or motor rotating backwards	error
`SER I/O - ERROR 30`	No serial communication between control panel and supply board/frequency converter	Serial interface communication failure	error
`SER I/O - ERROR 31`	No serial communication between control panel and frequency converter	Serial interface communication failure with frequency converter	error
`SER I/O - ERROR 32`	No serial communication between control panel and supply board due to version mismatch	Wrong machine or cooling version configured on supply board	error
`SER I/O - ERROR 33`	Control panel receives corrupt data from components	Data corruption from supply board or frequency converter	error
`SER I/O - ERROR 34`	Control panel receives corrupt data from frequency converter	Data corruption from frequency converter	error
`SER I/O - ERROR 35`	Control panel receives corrupt data from supply board	Data corruption from supply board	error
`SER I/O - ERROR 36`	Frequency converter cannot acknowledge command (NAK signal)	Frequency converter communication failure	error
`SER I/O - ERROR 37`	Supply board cannot acknowledge command (NAK signal)	Supply board communication failure	error
`VERSION - ERROR 12`	Version mismatch in supply board jumpers, control panel EPROM, or frequency converter	Incorrect jumper settings or wrong EPROM component	critical

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

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ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.