Danfoss VLT AutomationDrive FC 303 Instruction Manual page 66

Warnings and Alarms
Troubleshooting
Check for proper fan operation.
Cycle power to the Adjustable frequency drive
and make sure 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 Adjustable frequency drive
and make sure 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 Adjustable frequency drive is still
operational but without the brake function. Remove power
to the Adjustable frequency drive 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 Adjustable
frequency drive will trip when the dissipated braking
energy 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 Adjustable frequency drive 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 Adjustable frequency drive and
remove the brake resistor.
WARNING/ALARM 28, Brake check
The brake resistor is not connected or not working.
Check 2-15 Brake 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.
VLT ® AutomationDrive Instruction
Manual
The trip and reset points are based on the Adjustable
frequency drive power size.
Troubleshooting
Check for the following conditions.
ALARM 30, Motor phase U missing
Motor phase U between the Adjustable frequency drive
and the motor is missing.
Remove power from the Adjustable frequency drive and
check motor phase U.
ALARM 31, Motor phase V missing
Motor phase V between the Adjustable frequency drive
and the motor is missing.
Remove power from the Adjustable frequency drive and
check motor phase V.
ALARM 32, Motor phase W missing
Motor phase W between the Adjustable frequency drive
and the motor is missing.
Remove power from the Adjustable frequency drive 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, communication fault
Communication between the and the communication
option card is not operating.
WARNING/ALARM 35, Option fault
An option alarm is received. The alarm is option specific.
The most likely cause is a power-up or a communication
fault.
WARNING/ALARM 36, Line failure
This warning/alarm is only active if the supply voltage to
the Adjustable frequency drive is lost and 14-10 Mains
Failure is NOT set to [0] No Function. Check the fuses to the
Adjustable frequency drive and line power supply to the
unit.
ALARM 37, Imb of sup volt
There is a current imbalance between the power units
ALARM 38, Internal fault
When an internal fault occurs, a code number defined in
the table below is displayed.
®
MG.33.AI.22 - VLT is a registered Danfoss trademark
Ambient temperature too high.
Motor cable too long.
Incorrect airflow clearance above and below the
Adjustable frequency drive.
Blocked airflow around the Adjustable frequency
drive.
Damaged heatsink fan.
Dirty heatsink.
8 8
8-7