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WARNING 27
Brake chopper fault:
The brake transistor is monitored during opera-
tion and if it short-circuits, the brake function dis-
connects and the warning comes up. The adjust-
able frequency drive is still able to run, but since
the brake transistor has short-circuited, substan-
tial power is transmitted to the brake resistor,
even if it is inactive.
Turn off the adjustable frequency drive and re-
move the brake resistor.
Warning: There is a risk of substantial
power being transmitted to the brake
resistor if the brake transistor is short-
circuited.
ALARM/WARNING 28
Brake check failed:
Brake resistor fault: the brake resistor is not con-
nected/working.
ALARM 29
Drive overtemperature:
If the enclosure is IP 20 or IP 21/Type 1, the cut-
out temperature of the heatsink is 203
o
F +10
o
F
[95
o
C +5
o
C]. The temperature fault cannot be
reset until the temperature of the heatsink is be-
low 158
o
F +10
o
F [70
o
C +5
o
C].
The fault could be:
-
Ambient temperature too high
-
Motor cable too long
ALARM 30
Motor phase U missing:
Motor phase U between the adjustable frequency
drive and the motor is missing.
Turn off the adjustable frequency drive and check
motor phase U.
ALARM 31
Motor phase V missing:
Motor phase V between the adjustable frequency
drive and the motor is missing.
Turn off the adjustable frequency drive and check
motor phase V.
ALARM 32
Motor phase W missing:
Motor phase W between the adjustable frequency
drive and the motor is missing.
Turn off the adjustable frequency drive and check
motor phase W.
ALARM 33
Soft-charge fault:
Too many powerups have occured within a short
period of time. See the chapter
General Specifi-
cations
for the allowed number of power-ups with-
in one minute.
WARNING/ALARM 34
Ser. com. bus fault:
The serial communication bus on the communica-
tion option card is not working.
WARNING/ALARM 36
Line failure:
This warning/alarm is only active if the supply
voltage to the adjustable frequency drive is lost
and parameter 14-10 is NOT set to OFF. Possible
correction: check the fuses to the adjustable fre-
quency drive
ALARM 38
Internal fault:
When this alarm sounds, it may be necessary to
contact your Danfoss supplier. Some typical alarm
messages:
0 The serial port cannot be initialized. Se-
rious hardware failure
256 The power EEPROM data is defective or
too old.
512 The control board EEPROM data is de-
fective or too old.
513 Communication timeout Reading EE-
PROM data
514 Communication timeout Reading EE-
PROM data
515 The Application Orientated Control can-
not recognize the EEPROM data.
516 Cannot write to the EEPROM because a
write command is in progress.
517 The write command has timed out.
518 Failure in the EEPROM
519 Missing or invalid BarCode data in EE-
PROM 1024 – 1279 CAN telegram cannot
be sent. (1027 indicates a possible hard-
ware failure)
1281 Digital Signal Processor flash timeout
1282 Power micro software version mismatch
VLT
®
AutomationDrive FC 300 Instruction Manual
Warnings and Alarms
84
MG.33.A8.22 - VLT
®
is a registered Danfoss trademark.