Danfoss VLT Refrigeration Drive FC 103 Operating Instructions Manual page 71

Diagnostics and Troubleshoo...
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
•
Check the connections on all the 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 frequency converter programming
and switch settings match the analog signal type.
•
Perform an input terminal signal test.
WARNING/ALARM 3, No motor
No motor has been connected to the output of the
frequency converter.
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 on the frequency converter.
Options are programmed in parameter 14-12 Function at
Mains Imbalance.
Troubleshooting
•
Check the supply voltage and supply currents to
the frequency converter.
WARNING 5, DC link voltage high
The DC-link voltage (DC) is higher than the high-voltage
warning limit. The limit depends on the frequency
converter 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 frequency
converter voltage rating. The unit is still active.
WARNING/ALARM 7, DC overvoltage
If the DC-link voltage exceeds the limit, the frequency
converter trips after a time.
Troubleshooting
•
Connect a brake resistor.
•
Extend the ramp time.
•
Change the ramp type.
•
Activate the functions in parameter 2-10 Brake
Function.
MG16N102
Operating Instructions
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WARNING/ALARM 8, DC under voltage
If the DC-link voltage drops below the undervoltage limit,
the frequency converter checks if a 24 V DC back-up
supply is connected. If no 24 V DC back-up supply is
connected, the frequency converter trips after a fixed time
delay. The time delay varies with unit size.
Troubleshooting
•
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WARNING/ALARM 9, Inverter overload
The frequency converter 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%, while giving an alarm. The
frequency converter 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 whether the frequency converter
issues a warning or an alarm when the counter reaches
100% in parameter 1-90 Motor Thermal Protection. The fault
occurs when the motor runs with more than 100%
overload for too long.
Troubleshooting
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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).
Check that the supply voltage matches the
frequency converter voltage.
Perform an input voltage test.
Perform a soft charge circuit test.
Compare the output current shown on the LCP
with the frequency converter rated current.
Compare the output current shown on the LCP
with the measured motor current.
Show the thermal frequency converter load on
the LCP and monitor the value. When running
above the frequency converter continuous
current rating, the counter increases. When
running below the frequency converter
continuous current rating, the counter decreases.
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 are 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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