Honeywell NX VFD drive Fault code

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In this Article we are going to discuss about Honeywell NX VFD drive Fault code , Cause , and Remedy. The fault coding and trip logic are similar in all Honeywell NX inverters. This fault code , causes , and remedy are applies for both NXS and NXL HVAC.

Fault Code : 1 Overcurrent

Possible Cause :

• Frequency converter has detected too high a current (greater than 4 * In) in the motor cable:
• Sudden heavy load increase.
• Short circuit in motor cables.
• Unsuitable motor.

Remedy:

• Check loading.
• Check cables.
• Check motor size.

Fault Code : 2 Overvoltage

Possible Cause : The DC-link voltage has exceeded the limits defined in

• Too short a deceleration time.
• High over voltage spikes in utility.

Remedy: Increase deceleration time.

Fault Code : 3 Earth fault

Possible Cause :

• Current measurement has detected that the sum of motor phase current is not zero.
• Insulation failure in cables or motor.

Remedy: Check motor cables and motor.

 

Fault Code : 5 Charging switch

Possible Cause :

The charging switch is open when the Start command has been given.

• Faulty operation.
• Component failure.

Remedy:

• Reset the fault and restart.
• Should the fault recur, contact the technical support.

 

Fault Code : 7 Saturation Trip

Possible Cause : Various causes, e.g. faulty component.

Remedy:

• Cannot be reset from the keypad.
• Switch off power.
• Do not connect power.
• Contact Honeywell.
• If this fault appears simultaneously with Fault 1, check motor cables and motor.

 

Fault Code : 8 System fault

Possible Cause :

• Component failure.
• Faulty operation.

Remedy: Reset the fault and restart. Should the fault recur, contact the technical support.

 

Fault Code : 9 Under voltage

Possible Cause : DC-link voltage is under the voltage limits defined in:

• Most probable cause.
• Too low a supply voltage.
• Frequency converter internal fault.

Remedy:

• In case of temporary supply voltage break, reset the fault and restart the frequency converter.
• Check the supply voltage.
• If it is adequate, an internal failure has occurred.
• Contact the technical support.

Fault Code : 10 Input line Supervision

Possible Cause : Input line phase is missing.

Remedy: Check supply voltage and cable.

Fault Code : 11 Output Phase Supervision

Possible Cause : Current measurement has detected that there is no current in one motor phase.

Remedy: Check motor cables and motor.

 

Fault Code: 13 Inverter under Temperature

Possible Cause: Heat sink temperature is under – 10 °C.

Remedy: Check that the inverter is operated under specified conditions.

 

Fault Code : 14 Inverter over Temperature

Possible Cause :

• Heat sink temperature is over 90 °C.
• Over temperature warning is issued when the heat sink temperature exceeds 85 °C.

Remedy:

• Check the correct amount and flow of cooling air.
• Check the heatsink for dust.
• Check the ambient temperature.
• Make sure that the switching frequency is not too high in relation to ambient temperature and motor load.

 

Fault Code : 15 Motor Stalled

Possible Cause : Motor stall protection has tripped.

Remedy:

• Check motor.
• Check that pump or fan is not blocked.

 

Fault Code : 16 Motor over Temperature

Possible Cause :

• Motor overheating has been detected by frequency converter motor temperature model.
• Motor is overloaded.

Remedy:

• Decrease the motor load.
• If no motor overload exists, check the temperature model parameters.

 

Fault Code : 17 Motor Under Load

Possible Cause : Motor under load protection has tripped.

Remedy:

• FAN: check that belt is not broken.
• PUMP: check that pump is not dry.

 

Fault Code : 22 EEPROM Checksum Fault

Possible Cause : Parameter save fault:

• Faulty operation.
• Component failure.

Remedy: Contact the technical support.

 

Fault Code : 24 Counter fault

Possible Cause : Values displayed on counters are incorrect.

Remedy: Contact the technical support.

 

Fault Code : 25 Microprocessor Watchdog Fault

Possible Cause :

• Faulty operation.
• Component failure.

Remedy:

• Reset the fault and restart.
• Should the fault recur, contact the technical support.

 

Fault Code : 29 Thermistor fault

Possible Cause : The Thermistor input has detected increase of the motor temperature.

Remedy:

• Check motor cooling and loading.
• Check thermistor connection. (If thermistor input is not in use, it has to be short circuited.)

 

Fault Code : 32 Fan Cooling

Possible Cause : Cooling fan of the inverter does not start, when ON command is given.

Remedy: Contact the technical support.

 

Fault Code : 34 Internal Bus Communication

Possible Cause : Ambient interference of defective hardware.

Remedy: Should the fault recur, contact the technical support.

 

Fault Code : 35 Application fault

Possible Cause : Selected application does not function.

Remedy: Contact the technical support.

 

Fault Code : 39 Device Removed

Possible Cause :

• Option board removed.
• Drive removed.

Remedy: Reset the VFD drive

 

Fault Code : 40 Device unknown

Possible Cause : Unknown option board or drive.

Remedy: Contact the technical support.

 

Fault Code : 41 IGBT Temperature

Possible Cause : IGBT Inverter Bridge over temperature protection has detected to high a motor current.

Remedy:

• Check loading.
• Check motor size.

 

Fault Code : 44 Device change

Possible Cause :

• Option board changed.
• Option board has default settings.

Remedy: Reset the VFD drive

 

Fault Code : 45 Device added

Possible Cause : Option board added.

Remedy: Reset the VFD drive.

 

Fault Code : 50 Analogue input line current less than 4 milliamps (selected signal range 4 to 20 milliamps)

Possible Cause : 

• Current at the analogue input is less than 4 milliamps.
• Control cable is broken or loose.
• Signal source has failed.

Remedy: Check the current loop circuitry.

 

Fault Code : 51 External fault

Possible Cause :

• Digital input fault.
• Digital input has been programmed as external fault input and this input is active.

Remedy:

• Check the programming and the device indicated by the external fault information.
• Check also the cabling of this device.

 

Fault Code : 52 Keypad Communication Fault

Possible Cause : The connection between the control keypad and the frequency converter is broken.

Remedy: Check keypad connection and possible keypad cable.

 

Fault Code : 53 Field bus Fault

Possible Cause : The data connection between the field bus Master and the field-bus board is broken.

Remedy:

• Check installation.
• If installation is correct, contact the technical support.

 

Fault Code : 54 Slot Fault

Possible Cause : Defective option board or slot.

Remedy:

• Check board and slot.
• Contact the technical support.

 

Fault Code : 55 Actual value supervision

Possible Cause : Actual value has exceeded or fallen below the actual value supervision limit.

Remedy: Check the process.

 

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