high inertia loads. 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 through 1-25 for correct
motor data.
ALARM 14, Earth (ground) fault
There is current from the output phases to earth, either in
the cable between the frequency converter and the motor or
in the motor itself.
Troubleshooting
Remove power to the frequency converter and
repair the earth fault.
Check for earth faults in the motor by measuring
the resistance to ground of the motor leads and
the motor with a megohmmeter.
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:
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
ALARM 16, Short circuit
There is a short circuit 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 will only be active when
8-04 Control Timeout
Function
is NOT set to [0]
OFF
.
If
8-04 Control Timeout Function
is set to
Stop
and
Trip
, a
warning appears and the frequency converter ramps down
until it stops then displays an alarm.
Troubleshooting
Check connections on the serial communication
cable.
Increase
8-03 Control Timeout Time
Check operation of the communication equipment.
Verify proper installation based on EMC
requirements.
WARNING/ALARM 20, Temp. input error
The temperature sensor is not connected.
WARNING/ALARM 21, Parameter error
The parameter is out of range. The parameter number is
reported in the LCP. The affected parameter must be set to a
valid value.
WARNING/ALARM 22, Hoist mechanical brake
Report value will show what kind it is. 0 = The torque ref. was
not reached before timeout. 1 = There was no brake
feedback before timeout.
WARNING 23, Internal fan fault
The fan warning function checks if the fan is running. The fan
warning can be disabled in
14-53 Fan Monitor
.
Troubleshooting
Check for proper fan operation.
Cycle power to the frequency converter and check
that the fan operates briefly at start up.
Check the sensors on the heatsink and control card.
WARNING 24, External fan fault
The fan warning function checks if the fan is running. The fan
warning can be disabled in
14-53 Fan Monitor
.
Troubleshooting
Check for proper fan operation.
Cycle power to the frequency converter and check
that the fan operates briefly at start up.
Check the sensors on the heatsink and control card.
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation. If a short
circuit occurs, the brake function is disabled and the warning
appears. The frequency converter is still operational but
without the brake function. Remove power to the frequency
converter and replace the brake resistor (see
2-15 Brake
Check
).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated as a
mean value over the last 120 seconds of run time. The
calculation is based on the intermediate circuit voltage and
the brake resistance value set in
2-16 AC brake Max. Current
.
The warning is active when the dissipated braking is higher
than 90% of the brake resistance power. If
Trip
[2] is selected
in
2-13 Brake Power Monitoring
, the frequency converter will
trip when the dissipated braking power reaches 100%.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation and if a
short circuit occurs, the brake function is disabled and a
warning is issued. The frequency converter is still operational
but, since the brake transistor has short-circuited, substantial
power is transmitted to the brake resistor, even if it is
inactive.
Warnings and Alarms
VLT
®
AutomationDrive Operating
Instructions
54
MG.33.AJ.02 - VLT
®
is a registered Danfoss trademark
8
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