Danfoss VLT AutomationDrive FC 301 Operating Manual page 45

VLT® AutomationDrive FC 301/FC 302
Operating Guide
Troubleshooting
• Remove the wiring from terminal 50. If the warning clears, the problem is with the wiring. If the warning does not clear, replace
the control card.
7.4.2 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.
7.4.3 WARNING/ALARM 3, No Motor
Cause
No motor is connected to the output of the drive.
7.4.4 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.
7.4.5 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.
7.4.6 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.
7.4.7 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.
7.4.8 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.
Danfoss A/S © 2021.01
Maintenance, Diagnostics, and
Troubleshooting
AQ267037727118en-000101 / 130R0300 | 45