Troubleshooting
Compare the output current shown on the LCP
with the adjustable frequency 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
adjustable frequency drive continuous current
rating, the counter increases. When running
below the adjustable frequency drive continuous
current rating, the counter decreases.
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot. Select whether the adjustable frequency
drive issues a warning or an alarm when the counter
reaches 100% in
1-90 Motor Thermal Protection
. The fault
occurs when the motor runs with more than 100%
overload for too long.
Troubleshooting
Check for motor overheating.
Check if the motor is mechanically overloaded
Check that the motor current set in
1-24 Motor
Current
is correct.
Ensure that Motor data in parameters 1-20 to
1-25 are set correctly.
If an external fan is in use, check in
1-91 Motor
External Fan
that it is selected.
Running AMA in
1-29 Automatic Motor Adaptation
(AMA)
tunes the adjustable frequency drive to the
motor more accurately and reduces thermal
loading.
WARNING/ALARM 11, Motor thermistor overtemp
Check whether the thermistor is disconnected. Select
whether the adjustable frequency drive issues a warning or
an alarm in
1-90 Motor Thermal Protection
.
Troubleshooting
Check for motor overheating.
Check if the motor is mechanically overloaded.
When using terminal 53 or 54, check that the
thermistor is connected correctly between either
terminal 53 or 54 (analog voltage input) and
terminal 50 (+10 V supply). Also check that the
terminal switch for 53 or 54 is set for voltage.
Check
1-93 Thermistor Source
selects terminal 53
or 54.
When using digital inputs 18 or 19, check that
the thermistor is connected correctly between
either terminal 18 or 19 (digital input PNP only)
and terminal 50. Check
1-93 Thermistor Source
selects terminal 18 or 19.
WARNING/ALARM 12, Torque limit
The torque has exceeded the value in
4-16 Torque Limit
Motor Mode
or the value in
4-17 Torque Limit Generator
Mode
.
14-25 Trip Delay at Torque Limit
can change this from
a warning only condition to a warning followed by an
alarm.
Troubleshooting
If the motor torque limit is exceeded during
ramp-up, extend the ramp-up time.
If the generator torque limit is exceeded during
ramp-down, extend the ramp-down time.
If torque limit occurs while running, possibly
increase the torque limit. Make sure that the
system can operate safely at a higher torque.
Check the application for excessive current draw
on the motor.
WARNING/ALARM 13, Overcurrent
The inverter peak current limit (approximately 200% of the
rated current) is exceeded. The warning lasts about 1.5 s,
then the adjustable frequency drive trips and issues an
alarm. This fault can be caused by shock loading or quick
acceleration with high inertia loads. It can also appear after
kinetic backup if the acceleration during ramp-up is quick.
If extended mechanical brake control is selected, trip can
be reset externally.
Troubleshooting
Remove power and check if the motor shaft can
be turned.
Make sure that the motor size matches the
adjustable frequency drive.
Check parameters 1-20 to 1-25 for correct motor
data.
ALARM 14, Ground fault
There is current from the output phases to ground, either
in the cable between the adjustable frequency drive and
the motor or in the motor itself.
Troubleshooting:
Remove power to the adjustable frequency drive
and repair the ground fault.
Check for ground faults in the motor by
measuring the resistance to ground of the motor
leads and the motor with a megohmmeter.
Troubleshooting
Service Manual
MG94A222
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
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Summary of Contents for VLT FC 103
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