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VLT Ea4 Parallel Drive Modules
Operating Guide
Troubleshooting
Choose 1 of the following:
•
Connect a 24 V DC external supply.
•
Specify that no external supply is used via parameter 14-80 Option Supplied by External 24VDC, [0] No. A change in parameter
14-80 Option Supplied by External 24VDC requires a power cycle.
6.9.44 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.
6.9.45 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.
6.9.46 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.
6.9.47 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.
Danfoss A/S © 2023.01
Operating the Drive
AQ434333248451en-000101 / 130R1286 | 57
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