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VLT Ea4 Parallel Drive Modules
Operating Guide
-
Control card terminals 53 and 54 for signals, terminal 55 common.
-
VLT® General Purpose I/O MCB 101 terminals 11 and 12 for signals, terminal 10 common.
-
VLT® Analog I/O Option MCB 109 terminals 1, 3, and 5 for signals, terminals 2, 4, and 6 common.
•
Check that the drive programming and switch settings match the analog signal type.
•
Perform an input terminal signal test.
6.9.5 WARNING/ALARM 3, No Motor
Cause
No motor is connected to the output of the drive.
6.9.6 WARNING/ALARM 4, Mains Phase Loss
Cause
A phase is missing on the supply side, or the mains voltage imbalance is too high. This message also appears for a fault in the input
rectifier. Options are programmed in parameter 14-12 Function at Mains Imbalance.
Troubleshooting
•
Check the supply voltage and supply currents to the drive.
6.9.7 WARNING 5, DC Link Voltage High
Cause
The DC-link voltage (DC) is higher than the high-voltage warning limit. The limit depends on the drive voltage rating. The unit is still
active.
6.9.8 WARNING 6, DC Link Voltage Low
Cause
The DC-link voltage (DC) is lower than the low-voltage warning limit. The limit depends on the drive voltage rating. The unit is still
active.
6.9.9 WARNING/ALARM 7, DC Overvoltage
Cause
If the DC-link voltage exceeds the limit, the drive trips after a certain time.
Troubleshooting
•
Extend the ramp time.
•
Change the ramp type.
•
Activate the functions in parameter 2-10 Brake Function.
•
Increase parameter 14-26 Trip Delay at Inverter Fault.
•
If the alarm/warning occurs during a power sag, use kinetic back-up (parameter 14-10 Mains Failure).
•
Connect a brake resistor.
6.9.10 WARNING/ALARM 8, DC Undervoltage
Cause
If the DC-link voltage drops below the undervoltage limit, the drive checks for 24 V DC back-up supply. If no 24 V DC back-up supply
is connected, the drive trips after a fixed time delay. The time delay varies with unit size.
Troubleshooting
•
Check that the supply voltage matches the drive voltage.
•
Perform an input voltage test.
•
Perform a soft-charge circuit test.
6.9.11 WARNING/ALARM 9, Inverter Overload
Cause
The drive has run with more than 100% overload for too long and is about to cut out. The counter for electronic thermal inverter
protection issues a warning at 98% and trips at 100% with an alarm. The drive cannot be reset until the counter is below 90%.
Danfoss A/S © 2023.01
Operating the Drive
AQ434333248451en-000101 / 130R1286 | 49
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