Danfoss vlt FC 102 Operating Guide

•
-
-
-
•
•
•
•
•
•
•
•
•
•
•
•
7.6.2 WARNING/ALARM 2, Live Zero Error
Cause
This warning or alarm only appears if programmed in parameter 6-01 Live Zero Timeout Function. The signal on 1 of the analog inputs
is less than 50% of the minimum value programmed for that input. Broken wiring or a faulty device sending the signal can cause
this condition.
Troubleshooting
Check connections on all analog mains terminals.
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.
7.6.3 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.
7.6.4 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.
7.6.5 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.
7.6.6 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 backup (parameter 14-10 Mains Failure).
Connect a brake resistor.
7.6.7 WARNING/ALARM 8, DC Undervoltage
Cause
If the DC-link voltage drops below the undervoltage limit, the drive checks for 24 V DC backup supply. If no 24 V DC backup 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.
AQ267037536117en-000101 / 130R008368 | 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