Danfoss VLT HVAC Drive FC 102 Operating Manual page 136

VLT® HVAC Drive FC 102
Operating Guide
Status
0.0Hz
0.0Hz
Earth Fault [A14]
Auto Remote Trip
Illustration 74: Alarm Example
9.4.2 WARNING 1, 10 Volts Low
Cause
The control card voltage is less than 10 V from terminal 50. Remove some of the load from terminal 50, as the 10 V supply is overloa-
ded. Maximum 15 mA or minimum 590 Ω.
A short circuit in a connected potentiometer or incorrect wiring of the potentiometer can cause this condition.
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.
9.4.3 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.
9.4.4 WARNING/ALARM 3, No Motor
Cause
No motor is connected to the output of the drive.
9.4.5 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.
9.4.6 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.
136 | Danfoss A/S © 2021.11
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Maintenance, Diagnostics, and
Troubleshooting
AQ262141314214en-000301 / 130R0880