Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 123

Warnings and Alarms
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If using a thermal switch or thermistor, check that
the programming if 1-93 Thermistor Resource
matches sensor wiring.
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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.
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
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If the motor torque limit is exceeded during
ramp-up, extend the ramp-up time.
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If the generator torque limit is exceeded during
ramp down, extend the ramp-down time.
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If torque limit occurs while running, possibly
increase the torque limit. Be sure that the system
can operate safely at a higher torque.
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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 1.5 s,
then the frequency converter trips and issues an alarm.
Shock loading or fast acceleration with high-inertia loads
can cause this fault. If extended mechanical brake control
is selected, the trip can be reset externally.
Troubleshooting
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Remove power and check if the motor shaft can
be turned.
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Check that the motor size matches the frequency
converter.
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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
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Remove power from the frequency converter and
repair the ground fault.
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Check for ground faults in the motor by
measuring the resistance to ground of the motor
leads and the motor with a megohmmeter.
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Perform current sensor test.
MG11F502
Operating Instructions
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
the local Danfoss supplier:
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ALARM 16, Short circuit
There is short-circuiting in the motor or motor wiring.
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WARNING/ALARM 17, Control word timeout
There is no communication to the frequency converter.
The warning is only active when 8-04 Control Word Timeout
Function is NOT set to [0] Off.
If 8-04 Control Word Timeout Function is set to [5] Stop and
trip, a warning appears and the frequency converter ramps
down until it trips, then it displays an alarm.
Troubleshooting
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ALARM 18, Start failed
The speed has not been able to exceed 1-77 Compressor
Start Max Speed [RPM] during start within the allowed time
(set in 1-79 Compressor Start Max Time to Trip.) A blocked
motor may cause this alarm.
WARNING 23, Internal fan fault
The fan warning function is an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in 14-53 Fan Monitor ([0] Disabled).
For D, E and F enclosure sizes, the regulated voltage to the
fan is monitored.
Troubleshooting
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Danfoss A/S © 08/2014 All rights reserved.
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).
Remove power from the frequency converter and
repair the short circuit.
Check the connections on the serial communi-
cation cable.
Increase 8-03 Control Word Timeout Time.
Check the operation of the communication
equipment.
Verify a proper installation based on EMC
requirements.
Check fan resistance.
Check soft charge fuses.
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