Danfoss VLT HVAC Basic Drive FC 101 Programming Manual page 104

Troubleshooting
Troubleshooting
•
Compare the output current shown on the LCP
with the frequency converter rated current.
•
Compare the output current shown on the LCP
with measured motor current.
•
Display the thermal drive load on the LCP and
monitor the value. When running above the
frequency converter continuous current rating,
4 4
the counter increases. When running below the
frequency converter continuous current rating,
the counter decreases.
NOTICE
See the chapter Derating in the design guide for more
details, if a high switching frequency is required.
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
is that the motor is overloaded by more than 100% for too
long.
Troubleshooting
•
Check if the motor is overheating.
•
Check if the motor is mechanically overloaded.
•
Ensure that the motor parameter 1-24 Motor
Current is set correctly.
•
Ensure motor data in parameters 1-20 through
1-25 are set correctly.
•
Run AMA in parameter 1-29 Automatic Motor
Adaption (AMA).
WARNING/ALARM 11, Motor thermistor over temp
The thermistor or the thermistor connection is discon-
nected. Select whether the frequency converter issues a
warning or an alarm in parameter 1-90 Motor Thermal
Protection.
Troubleshooting
•
Check if the motor is overheating.
•
Check if the motor is mechanically overloaded.
•
Ensure that the thermistor is connected correctly.
•
If using a thermal switch or thermistor, ensure
that the programming of
parameter 1-93 Thermistor Source matches sensor
wiring.
WARNING/ALARM 13, Overcurrent
The inverter peak current limit is exceeded. The warning
lasts about 1.5 s, then the frequency converter trips and
issues an alarm.
102
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VLT HVAC Basic Drive FC 101
Troubleshooting
•
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•
•
ALARM 14, Earth (ground) fault
There is a discharge from the output phases to ground,
either in the cable between the frequency converter and
the motor or in the motor itself.
Troubleshooting
•
•
ALARM 16, Short circuit
There is short-circuiting in the motor or on the motor
terminals.
Turn off the frequency converter and remove the short
circuit.
WARNING/ALARM 17, Control word timeout
There is no communication to the frequency converter.
The warning is only active when parameter 8-04 Control
Timeout Function is not set to [0] Off.
If parameter 8-04 Control Timeout Function is set to [5] Stop
and trip, a warning appears and the frequency converter
ramps down until it trips while giving an alarm.
Troubleshooting
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WARNING/ALARM 24, Fan fault
The fan warning function is an extra protection function
that checks whether the fan is running/mounted. The fan
warning can be disabled in parameter 14-53 Fan Monitor
([0] Disabled).
Troubleshooting
•
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Turn off the frequency converter and check motor phase U.
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This fault may be caused by shock loading or fast
acceleration with high inertia loads.
Turn off the frequency converter. Check if the
motor shaft can be turned.
Check that the motor size matches the frequency
converter.
Incorrect motor data in parameters 1-20 to 1-25.
Turn off the frequency converter and remove the
ground fault.
Measure the resistance to ground the motor
cables and the motor with a megohmmeter to
check for ground faults in the motor.
Check connections on the serial communication
cable.
Increase parameter 8-03 Control Timeout Time.
Check operation of the communication
equipment.
Verify proper installation based on EMC
requirements.
Check fan resistance.
MG18B502