Table of Contents
Advertisement
8 Troubleshooting
Motor data in parameters 1-20 through 1-25 are set correctly.
The setting in par. 1-91
Run AMA in par. 1-29
WARNING/ALARM 11, Motor thermistor overtemp
The thermistor or the thermistor connection is disconnected. Select
whether the adjustable frequency drive gives a warning or an alarm when
the counter reaches 100% in par. 1-90
Troubleshooting:
Check if the motor is overheating.
Check if the motor is mechanically overloaded.
Check that the thermistor is connected correctly between ter-
minal 53 or 54 (analog voltage input) and terminal 50 (+10 V
supply), or between terminal 18 or 19 (digital input PNP only)
and terminal 50.
If a KTY sensor is used, check for correct connection between
terminal 54 and 55.
If using a thermal switch or thermistor, check the programming
Thermistor Source
of par. 1-93
If using a KTY sensor, check the programming of parameters
1-95, 1-96, and 1-97 match sensor wiring.
WARNING/ALARM 12, Torque limit
8
The torque is higher than the value in par. 4-16
Mode
(in motor operation) or the torque is higher than the value in
Torque Limit Generator Mode
par. 4-17
Trip Delay at Torque Limit
Par. 14-25
warning only condition to a warning followed by an alarm.
WARNING/ALARM 13, Overcurrent
The inverter peak current limit (approx. 200% of the rated current) is
exceeded. The warning lasts about 1.5 sec. Then the adjustable frequen-
cy drive trips and issues an alarm. If extended mechanical brake con-
trol is selected, trip can be reset externally.
Troubleshooting:
This fault may be caused by shock loading or fast acceleration
with high inertia loads.
Turn off the adjustable frequency drive. Check if the motor shaft
can be turned.
Make sure that the motor size matches the adjustable frequency
drive.
Incorrect motor data in parameters 1-20 through 1-25.
ALARM 14, Earth (ground) fault
There is a discharge from the output phases to ground, either in the cable
between the adjustable frequency drive and the motor or in the motor
itself.
8-6
Motor External Fan
.
Automatic Motor Adaptation (AMA)
.
Motor Thermal Protection
.
matches sensor wiring.
Torque Limit Motor
(in regenerative operation).
can be used to change this from a
MG.11.AB.22 - VLT
VLT
®
Troubleshooting:
Turn off the adjustable frequency drive and remove the ground
fault.
Measure the resistance to ground of the motor leads and the
motor with a megohmmeter to check for ground faults in the
motor.
Perform current sensor test.
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:
Par. 15-40
FC Type
Power Section
Par. 15-41
Voltage
Par. 15-42
Software Version
Par. 15-43
Par. 15-45
Actual Typecode String
SW ID Control Card
Par. 15-49
SW ID Power Card
Par. 15-50
Option Mounted
Par. 15-60
Par. 15-61
Option SW Version
ALARM 16, Short circuit
There is short-circuiting in the motor or on the motor terminals.
Turn off the adjustable frequency drive and remove 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 par. 8-04
Function
is NOT set to OFF.
Control Word Timeout Function
If par. 8-04
warning appears and the adjustable frequency drive ramps down until it
trips, while giving an alarm.
Troubleshooting:
Check connections on the serial communication cable.
Control Word Timeout Time
Increase par. 8-03
Check the operation of the communication equipment.
Verify proper installation based on EMC requirements.
WARNING 23, Internal fan fault
The fan warning function is an extra protection function that checks if the
fan is running / mounted. The fan warning can be disabled in
par. 14-53
Fan Monitor
([0] Disabled).
For the D, E, and F Frame drives, the regulated voltage to the fans is
monitored.
Troubleshooting:
Check fan resistance.
Check soft charge fuses.
®
is a registered Danfoss trademark
HVAC Drive Instruction Manual
Control Word Timeout
Stop
Trip
is set to
and
, a
Advertisement
Table of Contents
