Danfoss VLT HVAC Basic Drive FC 100 Series Programming Manual page 97

Troubleshooting
Troubleshooting:
Compare the output current shown on the LCP
with the drive 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 drive
continuous current rating, the counter should
increase. When running below the drive
continuous current rating, the counter should
decrease.
NOTE!
See the derating section 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 adjustable frequency
drive gives a warning or an alarm when the counter
reaches 100% in 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.
If the motor is mechanically overloaded
That the motor 1-24 Motor Current is set correctly.
Motor data in parameters 1-20 through 1-25 are
set correctly.
Run AMA in 1-29 Automatic Motor Adaption (AMA).
WARNING/ALARM 11, Motor thermistor overtemp
The thermistor or the thermistor connection is discon-
nected. Select whether the adjustable frequency drive
gives a warning or an alarm in 1-90 Motor Thermal
Protection.
Troubleshooting:
Check if the motor is overheating.
Check if the motor is mechanically overloaded.
Check that the thermistor is connected correctly.
If using a thermal switch or thermistor, check the
programming of 1-93 Thermistor Source matches
sensor wiring.
WARNING/ALARM 13, Over current
The inverter peak current limit is exceeded. The warning
lasts about 1.5 s, then the adjustable frequency drive trips
and issues an alarm.
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VLT HVAC Basic Drive Programming Guide
Troubleshooting:
ALARM 14, Earth (ground) fault
There is a discharge from the output phases to ground,
either in the cable between the adjustable frequency drive
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 adjustable frequency drive and remove the
short-circuit.
WARNING/ALARM 17, Control word timeout
There is no communication to the adjustable frequency
drive.
The warning will only be active when 8-04 Control Timeout
Function is NOT set to OFF.
If 8-04 Control Timeout Function is set to Stop and Trip, a
warning appears and the Adjustable frequency drive ramps
down until it trips, while giving an alarm.
Troubleshooting:
WARNING 24, Fan fault
The fan warning function is an extra protection function
that checks if the fan is running / mounted. The fan
warning can be disabled in 14-53 Fan Monitor ([0]
Disabled).
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MG18B222 - VLT is a registered Danfoss trademark
This fault may be caused by shock loading or fast
acceleration with high inertia loads.
Turn off the adjustable frequency drive. Check if
the motor shaft can be turned.
Make sure that the motor size matches the
adjustable frequency drive.
Incorrect motor data in parameters 1-20 through
1-25.
Turn off the adjustable frequency drive and
remove the ground fault.
Measure the resistance to ground of the motor
leads and the motor with a megohmmeter to
check for ground faults in the motor.
Check connections on the serial communication
cable.
Increase 8-03 Control Timeout Time
Check the operation of the communication
equipment.
Verify proper installation based on EMC
requirements.
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