Danfoss VLT FC 102 Operating Manual page 76

VLT HVAC Drive FC 102
Operating Guide
• 24 V.
• 5 V.
• ±18 V.
When powered with VLT 24 V DC Supply MCB 107, only 24 V and 5 V supplies are monitored. When powered with 3-phase mains
®
voltage, all 3 supplies are monitored.
Troubleshooting
• Check for a defective power card.
• Check for a defective control card.
• Check for a defective option card.
• If a 24 V DC supply is used, verify proper supply power.
• Check for a defective heat sink fan.
7.6.42 WARNING 47, 24 V Supply Low
Cause
The supply on the power card is out of range.
There are 3 supplies generated by the switch mode supply (SMPS) on the power card:
• 24 V.
• 5 V.
• ±18 V.
Troubleshooting
• Check for a defective power card.
7.6.43 WARNING 48, 1.8 V Supply Low
Cause
The 1.8 V DC supply used on the control card is outside of the allowed limits. The supply is measured on the control card.
Troubleshooting
• Check for a defective control card.
• If an option card is present, check for overvoltage.
7.6.44 WARNING 49, Speed Limit
Cause
The warning is shown when the speed is outside of the specified range in parameter 4-11 Motor Speed Low Limit [RPM] and parame-
ter 4-13 Motor Speed High Limit [RPM]. When the speed is below the specified limit in parameter 1-86 Trip Speed Low [RPM] (except
when starting or stopping), the drive trips.
7.6.45 ALARM 50, AMA Calibration Failed
Cause
A calibration error has occurred.
Troubleshooting
• Contact the Danfoss supplier or Danfoss service department.
7.6.46 ALARM 51, AMA Check Unom and Inom
Cause
The settings for motor voltage, motor current, and motor power are wrong.
Troubleshooting
• Check settings in parameters 1-20 to 1-25.
7.6.47 ALARM 52, AMA Low Inom
Cause
The motor current is too low.
76 | Danfoss A/S © 2023.09
Diagnostics and Troubleshooting
AQ267037536117en-000101 / 130R0083