Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual page 45

Maintenance, Diagnostics an...
WARNING 23, Internal fan fault
The fan warning function is an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in parameter 14-53 Fan Monitor ([0]
Disabled).
Troubleshooting
•
Check the fan resistance.
•
Check the soft charge fuses.
WARNING 24, External fan fault
The fan warning function is an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in parameter 14-53 Fan Monitor ([0]
Disabled).
Troubleshooting
•
Check the fan resistance.
•
Check the soft charge fuses.
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
from the frequency converter and replace the brake
resistor (see parameter 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 s of run time. The
calculation is based on the intermediate circuit voltage and
the brake resistance value set in parameter 2-16 AC brake
Max. Current. The warning is active when the dissipated
braking energy is higher than 90% of the brake resistance
power. If [2] Trip is selected in parameter 2-13 Brake Power
Monitoring, the adjustable frequency drive trips when the
dissipated braking energy reaches 100%.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation. 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 from the frequency converter and remove
the brake resistor.
This alarm/warning could also occur if the brake resistor
overheats. Terminals 104 and 106 are available as brake
resistor Klixon inputs, see Brake Resistor Temperature Switch
in the design guide.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check parameter 2-15 Brake Check.
MG20MC22
Operating Instructions
ALARM 29, Heat Sink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault does not reset until the
temperature drops below a defined heatsink temperature.
The trip and reset points vary based on the frequency
converter power size.
Troubleshooting
Check for the following conditions:
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This alarm is based on the temperature measured by the
heatsink sensor mounted inside the IGBT modules.
Troubleshooting
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ALARM 30, Motor phase U missing
Motor phase U between the adjustable frequency drive
and the motor is missing.
Troubleshooting
•
ALARM 31, Motor phase V missing
Motor phase V between the adjustable frequency drive
and the motor is missing.
Troubleshooting
•
ALARM 32, Motor phase W missing
Motor phase W between the adjustable frequency drive
and the motor is missing.
Troubleshooting
•
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
The serial communication bus on the communication
option card is not working.
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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.
Check the fan resistance.
Check the soft charge fuses.
Check the IGBT thermal sensor.
Remove power from the adjustable frequency
drive and check motor phase U.
Remove power from the adjustable frequency
drive and check motor phase V.
Remove power from the adjustable frequency
drive and check motor phase W.
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