Danfoss VLT AutomationDrive FC 300 Programming Manual page 211

Troubleshooting
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
5 5
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.
Remove power to the frequency converter and remove the
brake resistor.
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FC 300 Programming Guide
WARNING/ALARM 28, Brake check failed
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. The
trip and reset points are based on the frequency converter
power size.
Troubleshooting
Check for the following conditions.
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 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, Mains failure
This warning/alarm is only active if the supply voltage to the
frequency converter is lost and 14-10 Mains Failure is NOT set
to [0] No Function. Check the fuses to the frequency
converter and mains power supply to the unit.
ALARM 37, Phase imbalance
There is a current imbalance between the power units
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MG.33.MB.02 - VLT is a registered Danfoss trademark
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.