Danfoss VLT Refrigeration Drive FC 103 Operating Instructions Manual page 38

Maintenance, Diagnostics an...
WARNING/ALARM 11, Motor thermistor over temp
Check whether the thermistor is 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.
•
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
7 7
either terminal 18 or 19 (digital input PNP only)
and terminal 50. Check 1-93 Thermistor Source
selects terminal 12 to 18, 19, 32 or 33.
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
•
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, 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
•
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.
36
Operating Instructions
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
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
Danfoss:
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 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 stops then displays an alarm.
Troubleshooting
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). This may be
caused by a blocked motor.
Danfoss A/S © Rev. 2014-02-06 All rights reserved.
•
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
leads and the motor with a megohmmeter.
•
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)
•
Check connections on the serial communication
cable.
•
Increase 8-03 Control Word Timeout Time
•
Check the operation of the communication
equipment.
•
Verify a proper installation based on EMC
requirements.
MG16E302