Danfoss VLT AutomationDrive FC 301 Programming Manual page 205

Troubleshooting
frequency converter trips 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 2-15 Brake Check.
ALARM 29, Heatsink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault does not reset until the
temperature falls below a defined heatsink temperature.
The trip and reset points are different 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
The fieldbus on the communication option card is not
working.
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VLT AutomationDrive FC 301/302 Programming Guide
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 supply to the unit.
ALARM 37, Phase imbalance
There is a current imbalance between the power units
ALARM 38, Internal fault
When an internal fault occurs, a code number defined in
Table 5.4 is displayed.
Troubleshooting
It may be necessary to contact your Danfoss supplier or
service department. Note the code number for further
troubleshooting directions.
No.
0
256-258
512-519
783
1024-1284
1299
1300
1302
1315
1316
1318
1379-2819
1792
1793
1794
1795
1796
2561
2820
2821
2822
MG33MH02 - Rev. 2013-09-30
Cycle power
Check that the option is properly installed
Check for loose or missing wiring
Text
Serial port cannot be initialised. Contact your
Danfoss supplier or Danfoss Service Department.
Power EEPROM data is defective or too old.
Replace power card.
Internal fault. Contact your Danfoss supplier or
Danfoss Service Department.
Parameter value outside of min/max limits
Internal fault. Contact your Danfoss supplier or the
Danfoss Service Department.
Option SW in slot A is too old
Option SW in slot B is too old
Option SW in slot C1 is too old
Option SW in slot A is not supported (not allowed)
Option SW in slot B is not supported (not allowed)
Option SW in slot C1 is not supported (not
allowed)
Internal fault. Contact your Danfoss supplier or
Danfoss Service Department.
HW reset of DSP
Motor derived parameters not transferred correctly
to DSP
Power data not transferred correctly at power up
to DSP
The DSP has received too many unknown SPI
telegrams
RAM copy error
Replace control card
LCP stack overflow
Serial port overflow
USB port overflow
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