VLT
®
5000 Series
ALARM/WARNING 26
Brake resistor power 100%
(BRAKE PWR WARN 100%):
The power transmitted to the brake resistor is calcu-
lated as a percentage, as a mean value over the last
120 sec., on the basis of the resistance value of the
brake resistor (parameter 401) and the intermediate
circuit voltage. The warning is active when the dissi-
pated braking power is higher than 100%. If Trip [2]
has been selected in parameter 403, the VLT fre-
quency converter will cut out while giving this alarm.
WARNING 27
Brake transistor fault
(BRAKE IGBT FAULT):
The brake transistor is monitored during operation
and if it short-circuits, the brake function is discon-
nected and the warning comes up. The VLT
frequency converter will still be able to run, but since
the brake transistor has short-circuited, substantial
power will be transmitted to the brake resistor, even
if it is inactive.
Turn off the VLT frequency converter and remove the
brake resistor.
Warning: There is a risk of substan-
t
ial power being transmitted to the brake
resis- tor if the brake transistor has short-
circuited.
ALARM: 29
Heat sink temperature too high
(HEAT SINK OVER TEMP.):
If the enclosure is IP 00 or IP 20, the cut-out temper-
ature of the heat-sink is 90
C. If IP 54 is used, the
cut-out temperature is 80
C.
The tolerance is ± 5
C. The temperature fault cannot
be reset, until the temperature of the heat-sink is be-
low 60
C.
The fault could be the following:
- Ambient temperature too high
- Too long motor cable
- Too high switching frequency.
ALARM: 30
Motor phase U missing
(MISSING MOT.PHASE U):
Motor phase U between VLT frequency converter
and motor is missing.
Turn off the VLT frequency converter and check mo-
tor phase U.
ALARM: 31
Motor phase V missing
(MISSING MOT.PHASE V):
Motor phase V between VLT frequency converter
and motor is missing.
Turn off the VLT frequency converter and check mo-
tor phase V.
ALARM: 32
Motor phase W missing
(MISSING MOT.PHASE W):
Motor phase W between VLT frequency converter
and motor is missing.
Turn off the VLT frequency converter and check mo-
tor phase W.
ALARM: 33
Quick discharge not OK
(QUICK DISCHARGE NOT OK):
Check whether a 24 Volt external DC supply has
been connected and that an external brake/dis-
charge resistor has been fitted.
WARNING/ALARM: 34
Profibus communication fault
(PROFIBUS COMMUNICATION FAULT):
The profibus on the communication option card is
not working.
WARNING: 35
Out of frequency range
(OUT OF FREQUENCY RANGE):
This warning is active if the output frequency has
reached its Output frequency low limit (parameter
201) or Output frequency high limit (parameter 202).
If the VLT frequency converter is in Process control,
closed loop (parameter 100), the warning will be ac-
tive in the display. If the VLT frequency converter is
in another mode than Process control, closed loop ,
bit 008000 Out of frequency range in extended sta-
tus word will be active, while there will be no
warning in the display.
WARNING/ALARM: 36
Mains failure (MAINS FAILURE):
This warning/alarm is only active if the supply volt-
age to the VLT frequency converter is lost and if
parameter 407 Mains fault has been set to another
value than OFF .
If parameter 407 has been set to Contr. ramp-down
trip [2], the VLT frequency converter will first give a
warning and then ramp down and trip, while giving
an alarm. Check the fuses to the VLT frequency
converter.
MG.51.A1.02 - VLT is a registered Danfoss trade mark
180
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