Danfoss VLT AutomationDrive FC 300 Instruction Manual page 74

Warnings and Alarms
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) and 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.
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 if 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
8 8
Resource, and 1-97 KTY Threshold level match
sensor wiring.
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. Be sure 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 may be caused by shock loading or quick
acceleration with high inertia loads. It may 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.
8-6
®
VLT Automation Drive D-Frame
Instruction Manual
Troubleshooting
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:
ALARM 15, Hardware mismatch
A fitted option is not operational with the present control
board hardware or software.
Record the value of the following parameters and contact
your Danfoss supplier:
ALARM 16, Short-circuit
There is short-circuiting in the motor or motor wiring.
Remove power to the adjustable frequency drive and
repair 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 Word
Timeout Function is NOT set to [Off].
If 8-04 Control Word Timeout Function is set to Stop and
Trip, a warning appears and the adjustable frequency drive
ramps down until it trips then displays an alarm.
®
MG34U222 - VLT is a registered Danfoss trademark
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.
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.
Perform current sensor test.
15-40 FC Type
15-41 Power Section
15-42 Voltage
15-43 Software Version
15-45 Actual Typecode String
15-49 SW ID Control Card
15-50 SW ID Power Card
15-60 Option Mounted
15-61 Option SW Version (for each option slot)