Warning/Alarm 13, Over Current; Alarm 14, Earth (Ground) Fault; Warning/Alarm 17, Control Word Timeout; Alarm 28, Brake Check - Danfoss VLT Midi Drive FC 280 Programming Manual

Troubleshooting
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, 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, Over current

The inverter peak current limit (approximately 200% of the
rated current) is exceeded. The warning lasts about 5 s,
6 6
then the frequency converter trips and issues an alarm.
Shock loading or fast acceleration with high-inertia loads
can cause this fault.
Troubleshooting
•
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.

ALARM 14, Earth (ground) fault

There is current from the output phases to ground, either
in the cable between the frequency converter and the
motor, or in the motor itself.
Troubleshooting
•
Remove power to the frequency converter and
repair the ground fault.
•
Check for ground faults in the motor by
measuring the resistance to ground of the motor
cables and the motor with a megohmmeter.
ALARM 16, Short circuit
There is short-circuiting in the motor or motor wiring.
•
Remove power to the frequency converter and
repair 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
Word Timeout Function is NOT set to [0] Off.
If parameter 8-04 Control Word Timeout Function is set to [5]
Stop and Trip, a warning appears. The frequency converter
then ramps down until it trips, while giving an alarm.
Parameter 8-03 Control Timeout Time could possibly be
increased.
Troubleshooting
•
Check connections on the serial communication
cable.
•
Increase parameter 8-03 Control Word Timeout
Time.
128
®
VLT Midi Drive FC 280
•
•
ALARM 25, Brake resistor short circuit
The brake resistor is monitored during start-up. If a short
circuit occurs, the brake function is disabled and the alarm
appears. The frequency converter is tripped.
Troubleshooting
•
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated as
a mean value over the last 120 s of run time. The
calculation is based on the DC-link voltage and the brake
resistor value set in parameter 2-11 Brake Resistor (ohm).
The warning is active when the dissipated braking power
is higher than the value set in parameter 2-12 Brake Power
Limit (kW). The frequency converter trips if the warning
keeps for 1200 s.
Troubleshooting
•
ALARM 27, Brake IGBT/brake chopper short circuited
The brake transistor is monitored during start-up. If a short
circuit occurs, the brake function is disabled, and an alarm
is issued. The frequency converter is tripped.
Troubleshooting
•

ALARM 28, Brake check

The brake resistor is not connected or not working.
Troubleshooting
•
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Troubleshooting
•
ALARM 31, Motor phase V missing
Motor phase V between the frequency converter and the
motor is missing.
Troubleshooting
•
ALARM 32, Motor phase W missing
Motor phase W between the frequency converter and the
motor is missing.
Danfoss A/S © 07/2016 All rights reserved.
Check the operation of the communication
equipment.
Verify a proper installation based on EMC
requirements.
Remove the power to the frequency converter
and check the connection of the brake resistor.
Decrease brake energy via lower speed or longer
ramp time.
Remove the power to the frequency converter
and remove the brake resistor.
Check if brake resistor is connected or it is too
large for the frequency converter.
Remove power from the frequency converter and
check motor phase U.
Remove power from the frequency converter and
check motor phase V.
MG07C302