Danfoss VLT FC 102 Operating Instructions Manual page 174

9 Troubleshooting
WARNING/ALARM 11, Motor thermistor over temp
The thermistor or the thermistor connection is disconnected. Select
whether the frequency converter gives a warning or an alarm when the
counter reaches 100% in par. 1-90
Troubleshooting:
Check if motor is over heating.
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 matches sensor wiring.
of par. 1-93
If using a KTY sensor, check the programming of parameters
1-95, 1-96, and 1-97 match sensor wiring.
Troubleshooting:
This fault may be caused by shock loading or fast acceleration
with high inertia loads.
Turn off the frequency converter. Check if the motor shaft can
be turned.
9
Check that the motor size matches the frequency converter.
Incorrect motor data in parameters 1-20 through 1-25.
ALARM 14, Earth (ground) fault
There is a discharge from the output phases to earth, either in the cable
between the frequency converter and the motor or in the motor itself.
Troubleshooting:
Turn off the frequency converter and remove the earth fault.
Measure the resistance to ground of the motor leads and the
motor with a megohmmeter to check for earth faults in the mo-
tor.
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:
FC Type
Par. 15-40
Par. 15-41 Power Section
Par. 15-42 Voltage
Software Version
Par. 15-43
Actual Typecode String
Par. 15-45
Par. 15-49 SW ID Control Card
Par. 15-50 SW ID Power Card
Option Mounted
Par. 15-60
174
Motor Thermal Protection .
MG.16.A1.02 - VLT
VLT HVAC Low Harmonic Drive Operating In-
Option SW Version
Par. 15-61
ALARM 16, Short circuit
There is short-circuiting in the motor or on the motor terminals.
Turn off the frequency converter and remove the short-circuit.
WARNING/ALARM 17, Control word timeout
There is no communication to the frequency converter.
The warning will only be active when par. 8-04
tion is NOT set to OFF.
Control Timeout Function is set to Stop and Trip , a warning
If par. 8-04
appears and the frequency converter ramps down until it trips, while giv-
ing an alarm.
Troubleshooting:
Check connections on the serial communication cable.
Control Timeout Time
Increase par. 8-03
Check 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.
WARNING 24, External 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.
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation. If it short circuits, the
brake function is disconnected and the warning appears. The frequency
converter still works, but without the brake function. Turn off the fre-
quency converter and replace the brake resistor (see par. 2-15
Check ).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated: as a percent-
age, as a mean value over the last 120 seconds, on the basis of the re-
sistance value of the brake resistor, and the intermediate circuit voltage.
The warning is active when the dissipated braking power is higher than
Trip [2] has been selected in par. 2-13 Brake Power Monitoring ,
90%. If
®
is a registered Danfoss trademark
structions
Control Timeout Func-
Brake