Honeywell NX VFD drive Fault code

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.


Honeywell NX VFD drive Fault code


Fault Code : 1 Overcurrent

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

Possible Cause : Motor stall protection has tripped.

Remedy:

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

 

Fault Code : 16 Motor over Temperature

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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

Honeywell NX VFD drive Fault code

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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