Turn off the frequency converter and check
motor phase U.
ALARM 31
Motor phase V missing:
Motor phase V between the frequency con-
verter 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 con-
verter 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. See the chapter
Specifica-
tions
for the allowed number of powerups
within one minute.
WARNING/ALARM 34
Fieldbus communication fault:
The fieldbus on the communication option
card is not working.
WARNING 35
Out of frequency range:
This warning is active if the output frequency
has reached its
Warning speed low
(par. 4-52)
or
Warning speed high
(par. 4-53). If the fre-
quency converter is in
Process control, closed
loop
(par. 1-00), the warning is active in the
display. If the frequency converter is not in
this mode bit 008000 Out of
frequency range
in extended status word is active but there is
no warning in the display.
ALARM 38
Internal fault:
Contact the local Danfoss supplier.
WARNING 47
24 V supply low:
The external 24 V DC backup power supply
may be overloaded, otherwise contact the lo-
cal Danfoss supplier.
WARNING 48
1.8 V supply low:
Contact the local Danfoss supplier.
7. Troubleshooting VLT
®
HVAC Drive Operating Instructions
126
MG.11.A4.02 - 09.10.06. VLT
®
is a registered Danfoss trademark
7
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