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
of par. 1-93
Thermistor Source
matches sensor wiring.
If using a KTY sensor, check the programming of ameters 1-95,
1-96, and 1-97 match sensor wiring.
WARNING/ALARM 12, Torque limit
The torque is higher than the value in par. 4-16
Torque Limit Motor
Mode
(in motor operation) or the torque is higher than the value in
par. 4-17
Torque Limit Generator Mode
(in regenerative operation).
Par. 14-25
Trip Delay at Torque Limit
can be used to change this from a
warning only condition to a warning followed by an alarm.
WARNING/ALARM 13, Over Current
The inverter peak current limit (approx. 200% of the rated current) is
exceeded. The warning lasts about 1.5 sec., then the frequency converter
trips and issues an alarm. If extended mechanical brake control is selec-
ted, trip can be reset externally.
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.
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:
Par. 15-40
FC Type
Par. 15-41
Power Section
Par. 15-42
Voltage
Par. 15-43
Software Version
Par. 15-45
Actual Typecode String
Par. 15-49
SW ID Control Card
Par. 15-50
SW ID Power Card
Par. 15-60
Option Mounted
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 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
Control Word Timeout
Function
is NOT set to OFF.
If par. 8-04
Control Word Timeout Function
is set to
Stop
and
Trip
, a
warning appears and the frequency converter ramps down until it trips,
while giving an alarm.
Troubleshooting:
Check connections on the serial communication cable.
Increase par. 8-03
Control Word Timeout Time
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
Brake
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
resistance value of the brake resistor, and the intermediate circuit volt-
age. The warning is active when the dissipated braking power is higher
than 90%. If
Trip
[2] has been selected in par. 2-13
Brake Power Moni-
toring
, the frequency converter cuts out and issues this alarm, when the
dissipated braking power is higher than 100%.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation and if it short-circuits,
the brake function disconnects and issues a warning. The frequency con-
verter is still able to run, but since the brake transistor has short-circuited,
substantial power is transmitted to the brake resistor, even if it is inactive.
Turn off the frequency converter and remove the brake resistor.
VLT
®
HVAC Drive Design Guide
8 General Specifications and Troubleshooting
MG.11.B9.02 - VLT
®
is a registered Danfoss trademark
189
8