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.
WARNING 23, Internal fan fault
The fan warning function checks if the fan is running. The fan
warning can be disabled in
.
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
.
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.
Remove power to the frequency converter and remove the
brake resistor.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check
.
ALARM 29, Heatsink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault will not reset until the
temperature falls below the reset heatsink temperature. The
trip and reset points are based on the frequency converter
power size.
Troubleshooting
Check for the following conditions.
Ambient temperature too high.
Motor cable too long.
Incorrect airflow clearance above and below the
frequency converter.
Blocked airflow around the frequency converter.
Damaged heatsink fan.
Dirty heatsink.
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Remove power from the frequency converter and check
motor phase U.
ALARM 31, Motor phase V missing
Motor phase V between the frequency converter and the
motor is missing.
Remove power from the frequency converter and check
motor phase V.
ALARM 32, Motor phase W missing
Motor phase W between the frequency converter and the
motor is missing.
Remove power from the frequency converter and check
motor phase W.
ALARM 33, Inrush fault
Too many power-ups have occurred within a short time
period. Let the unit cool to operating temperature.
WARNING/ALARM 34, Fieldbus communication fault
Communication between the fieldbus and the communi-
cation option card is not operating.
WARNING/ALARM 36, Mains failure
This warning/alarm is only active if the supply voltage to the
frequency converter is lost and
is NOT set
to [0]
No Function
. Check the fuses to the frequency
converter and mains power supply to the unit.
ALARM 38, Internal fault
When an internal fault occurs, a code number defined in the
table below is displayed.
Troubleshooting
Cycle power to the frequency converter.
Check that the option is properly installed.
Check for loose or missing wiring.
It may be necessary to contact your Danfoss supplier or
service department. Note the code number for further
troubleshooting directions.
Troubleshooting
VLT
®
HVAC Drive Programming Guide
MG.11.CB.02 - VLT
®
is a registered Danfoss trademark
193
4
4
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