the frequency converter cuts out and issues this alarm, when the dissi-
pated 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 con-
verter 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.
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 tem-
perature 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:
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.
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:
Check fan resistance.
Check soft charge fuses.
IGBT thermal sensor.
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the motor is miss-
ing.
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 miss-
ing.
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.
WARNING/ALARM 34, Fieldbus communication fault
The fieldbus on the communication option card is not working.
WARNING/ALARM 35, Out of frequency range:
This warning is active if the output frequency has reached the high limit
(set in par. 4-53) or low limit (set in par. 4-52). In
Process Control, Closed
Loop
(par. 1-00) this warning is displayed.
WARNING/ALARM 36, Mains failure
This warning/alarm is only active if the supply voltage to the frequency
converter is lost and par. 14-10
Mains Failure
is NOT set to OFF. Check
the fuses to the frequency converter
ALARM 38, Internal fault
It may be necessary to contact your Danfoss supplier. Some typical alarm
messages:
0 Serial port cannot be initialized. Serious hardware fail-
ure
256-258 Power EEPROM data is defect or too old
512 Control board EEPROM data is defect or too old
513 Communication time out reading EEPROM data
514 Communication time out reading EEPROM data
515 Application Orientated Control cannot recognize the
EEPROM data
516 Cannot write to the EEPROM because a write command
is on progress
517 Write command is under time out
518 Failure in the EEPROM
519 Missing or invalid Barcode data in EEPROM
783 Parameter value outside of min/max limits
1024-1279 A can-telegram that has to be sent, couldn't be sent
1281 Digital Signal Processor flash timeout
1282 Power micro software version mismatch
1283 Power EEPROM data version mismatch
1284 Cannot read Digital Signal Processor software version
1299 Option SW in slot A is too old
1300 Option SW in slot B is too old
1301 Option SW in slot C0 is too old
1302 Option SW in slot C1 is too old
1315 Option SW in slot A is not supported (not allowed)
1316 Option SW in slot B is not supported (not allowed)
1317 Option SW in slot C0 is not supported (not allowed)
1318 Option SW in slot C1 is not supported (not allowed)
1379 Option A did not respond when calculating Platform
Version.
1380 Option B did not respond when calculating Platform
Version.
1381 Option C0 did not respond when calculating Platform
Version.
1382 Option C1 did not respond when calculating Platform
Version.
1536 An exception in the Application Orientated Control is
registered. Debug information written in LCP
VLT HVAC Low Harmonic Drive Operating In-
structions 9 Troubleshooting
MG.16.A1.02 - VLT
®
is a registered Danfoss trademark 175
9
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