Danfoss VLT HVAC Drive FC 102 Operating Manual page 140

Operating Guide | VLT® HVAC Drive FC 102
9.3.33 WARNING/ALARM 34, Fieldbus Communication Fault
Cause
The fieldbus on the communication option card is not working.
9.3.34 WARNING/ALARM 35, Option Fault
Cause
An option alarm is received. The alarm is option-specific. The most likely cause is a power-up or a communication fault.
9.3.35 WARNING/ALARM 36, Mains Failure
Cause
This warning/alarm is only active if the supply voltage to the drive is lost and parameter 14-10 Mains Failure is not set to [0] No Function.
Troubleshooting
• Check the fuses to the drive and mains supply to the unit.
9.3.36 ALARM 37, Phase Imbalance
Cause
There is a current imbalance between the power units.
9.3.37 ALARM 38, Internal Fault
Cause
When an internal fault occurs, a code number defined in
Troubleshooting
• Cycle power.
• Check that the option is properly installed.
• Check for loose or missing wiring.
It may be necessary to contact the Danfoss supplier or service department. Note the code number for further troubleshooting
directions.
Table 73: Internal Fault Codes
Number Text
0 The serial port cannot be initialized. Contact the Danfoss supplier or Danfoss service department.
256-258 The power EEPROM data is defective or too old. Replace the power card.
512-519 Internal fault. Contact the Danfoss supplier or Danfoss service department.
783 Parameter value outside of minimum/maximum limits.
140 | Danfoss A/S © 2018.10
table 73 is shown.
Maintenance, Diagnostics, and
Troubleshooting
AQ262141314214en-000101 / 130R0880