Danfoss VLT FC 103 Operating Manual page 69

Maintenance, Diagnostics, a...
WARNING/ALARM 2, Live zero error
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
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Check connections on all analog mains terminals.
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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.
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Check that the drive programming and switch
settings match the analog signal type.
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Perform an input terminal signal test.
WARNING/ALARM 3, No motor
No motor has been connected to the output of the drive.
WARNING/ALARM 4, Mains phase loss
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.
WARNING 5, DC link voltage high
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.
WARNING 6, DC link voltage low
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.
WARNING/ALARM 7, DC overvoltage
If the DC-link voltage exceeds the limit, the drive trips after
a time.
Troubleshooting
•
Extend the ramp time.
•
Change the ramp type.
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Increase parameter 14-26 Trip Delay at Inverter
Fault.
•
Check that the supply voltage matches the active
front-end drive voltage.
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Perform input voltage test.
MG16P222
Operating Guide
WARNING/ALARM 8, DC under voltage
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
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WARNING/ALARM 9, Inverter overload
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%.
Troubleshooting
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WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot.
Select 1 of these options:
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The fault occurs when the motor runs with more than
100% overload for too long.
Troubleshooting
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Check that the supply voltage matches the drive
voltage.
Perform an input voltage test.
Perform a soft-charge circuit test.
Compare the output current shown on the LCP
with the drive rated current.
Compare the output current shown on the LCP
with the measured motor current.
Show the thermal drive load on the LCP and
monitor the value. When running above the drive
continuous current rating, the counter increases.
When running below the drive continuous
current rating, the counter decreases.
The drive issues a warning or an alarm when the
counter is >90% if parameter 1-90 Motor Thermal
Protection is set to warning options.
The drive trips when the counter reaches 100% if
parameter 1-90 Motor Thermal Protection is set to
trip options.
Check for motor overheating.
Check if the motor is mechanically overloaded.
Check that the motor current set in
parameter 1-24 Motor Current is correct.
Ensure that the motor data in parameters 1-20 to
1-25 is set correctly.
If an external fan is in use, check that it is
selected in parameter 1-91 Motor External Fan.
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