Danfoss FC 100 Series Operating Instructions Manual page 129

Troubleshooting
Troubleshooting:
Check connections on the serial communication
cable.
Increase par. 8-03 Control Timeout Time
Check operation of the communication equipment.
Verify proper installation based on EMC require-
ments.
WARNING 23, Internal fan fault
The fan warning function is an extra protection function that
checks if the fan is running / mounted. The fan warning can be
disabled in par. 14-53 Fan Monitor ([0] Disabled).
For the D, E, and F Frame drives, the regulated voltage to the
fans is monitored.
Troubleshooting:
Check fan resistance.
Check soft charge fuses.
WARNING 24, External fan fault
The fan warning function is an extra protection function that
checks if the fan is running / mounted. The fan warning can be
disabled in par. 14-53 Fan Monitor ([0] Disabled).
For the D, E, and F Frame drives, the regulated voltage to the
fans is monitored.
Troubleshooting:
Check fan resistance.
Check soft charge fuses.
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation. If it short
circuits, the brake function is disconnected and the warning
appears. The frequency converter still works, but without the
brake function. Turn off the frequency converter and replace
the brake resistor (see par. 2-15 Brake Check).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated: as a
percentage, as a mean value over the last 120 seconds, on the
basis of the resistance value of the brake resistor, and the
intermediate circuit voltage. The warning is active when the
dissipated braking power is higher than 90%. If Trip [2] has
been selected in par. 2-13 Brake Power Monitoring, the
frequency converter cuts out and issues this alarm, when the
dissipated braking power is higher than 100%.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation and if it
short-circuits, the brake function disconnects and issues a
warning. The frequency converter is still able to run, but since
the brake transistor has short-circuited, substantial power is
transmitted to the brake resistor, even if it is inactive.
Turn off the frequency converter and remove the brake
resistor.
®
VLT HVAC Drive Operating Instructions
This alarm/ warning could also occur should the brake resistor
overheat. Terminal 104 to 106 are available as brake resistor.
Klixon inputs, see section Brake Resistor Temperature Switch.
WARNING/ALARM 28, Brake check failed
Brake resistor fault: the brake resistor is not connected or not
working.
Check par. 2-15 Brake Check.
ALARM 29, Heatsink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault will not be reset until the
temperature falls below a defined heatsink temperature. The
trip and reset point are different based on the drive power
size.
Troubleshooting:
For the D, E, and F Frame Drives, this alarm is based on the
temperature measured by the heatsink sensor mounted inside
the IGBT modules. For the F Frame drives, this alarm can also
be caused by the thermal sensor in the Rectifier module.
Troubleshooting:
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Turn off 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.
Turn off 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.
Turn off the frequency converter and check motor phase W.
ALARM 33, Inrush fault
Too many power-ups have occurred within a short time
period. Let unit cool to operating temperature.
®
MG.11.AD.02 - VLT is a registered Danfoss trademark
Ambient temperature too high.
Too long motor cable.
Incorrect clearance above and below the drive.
Dirty heatsink.
Blocked air flow around the drive.
Damaged heatsink fan.
Check fan resistance.
Check soft charge fuses.
IGBT thermal sensor.
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