Danfoss vlt FC 102 Operating Guide

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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.
AQ267037536117en-000101 / 130R008376 | Danfoss A/S © 2023.09
Diagnostics and Troubleshooting
VLT HVAC Drive FC 102
Operating Guide

Danfoss vlt FC 102 Specifications

General

Brand	Danfoss
Model	vlt FC 102
Category	DC Drives
Language	English