Danfoss VLT HVAC Drive FC 102 Operating Manual page 114

Operating Guide | VLT® HVAC Drive FC 102
8.4.42 ALARM 45, Earth Fault 2
Cause
Ground fault.
Troubleshooting
• Check for proper grounding and loose connections.
• Check for proper wire size.
• Check the motor cables for short circuits or leakage currents.
8.4.43 ALARM 46, Power Card Supply
Cause
The supply on the power card is out of range. Another reason can be a defective heat sink fan.
There are 3 supplies generated by the switch mode supply (SMPS) on the power card:
• 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.
8.4.44 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.
112 | Danfoss A/S © 2020.01
Maintenance, Diagnostics, and
Troubleshooting
AQ275556502253en-000101 / 130R0706