Danfoss VLT AutomationDrive FC 302 Operating Instructions Manual page 69

Warnings and Alarms
WARNING/ALARM 9, Inverter overload
The frequency converter is about to cut out because of an
overload (too high current for too long). 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%.
The fault is that the frequency converter has run with
more than 100% overload for too long.
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,
the counter increases. When running below the
frequency converter 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 frequency converter
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 frequency converter to the
motor more accurately and reduces thermal
loading.
WARNING/ALARM 11, Motor thermistor over temp
The thermistor might be disconnected. Select whether the
frequency converter issues a warning or an alarm in
1-90 Motor Thermal Protection.
Troubleshooting
Check for motor overheating.
Check if the motor is mechanically overloaded.
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
MG34U302
Operating Instructions
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
warning from a warning-only condition to a warning
followed by an alarm.
Troubleshooting
•
•
•
•
WARNING/ALARM 13, Over current
The inverter peak current limit (approximately 200% of the
rated current) is exceeded. The warning lasts about 1.5 s,
then the frequency converter trips and issues an alarm.
Shock loading or quick acceleration with high inertia loads
can cause this fault. If the acceleration during ramp up is
quick, the fault can also appear after kinetic back-up. If
extended mechanical brake control is selected, trip can be
reset externally.
Troubleshooting
•
•
•
ALARM 14, Earth (ground) fault
There are current from the output phases to ground, either
in the cable between the frequency converter and the
motor or in the motor itself.
Danfoss A/S © Rev. 2014-02-20 All rights reserved.
voltage. Check that 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.
If a KTY sensor is used, check for correct
connection between terminals 54 and 55
If using a thermal switch or thermistor, check that
the programming of 1-93 Thermistor Resource
matches sensor wiring.
If using a KTY Sensor, check the programming of
1-95 KTY Sensor Type, 1-96 KTY Thermistor Resource
and 1-97 KTY Threshold level match sensor wiring.
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.
Remove power and check if the motor shaft can
be turned.
Check that the motor size matches the frequency
converter.
Check parameters 1-20 to 1-25 for correct motor
data.
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