Danfoss VLT AutomationDrive FC 300 Instruction Manual page 112

6 Troubleshooting
WARNING 25, Brake resistor short-circuited:
The brake resistor is monitored during operation. If it short-circuits, the
brake function is disconnected and the warning appears. The adjustable
frequency drive still works, but without the brake function. Turn off the
adjustable frequency drive and replace the brake resistor (see
par. 2-15 Brake Check ).
WARNING/ALARM 26, Brake resistor power limit:
The power transmitted to the brake resistor is calculated as a percentage,
as a mean value over the last 120 s, on the basis of the resistance value
of the brake resistor (par. 2-11
ate circuit voltage. The warning is active when the dissipated braking
energy is higher than 90%. If
Brake Power Monitoring
par. 2-13
out and issues this alarm, when the dissipated braking energy is higher
than 100%.
WARNING/ALARM 27, Brake chopper fault:
The brake transistor is monitored during operation and if it short-circuits,
6
the brake function disconnects and the warning comes up. The adjustable
frequency drive 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 adjustable frequency drive 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: There is a risk of substantial power being
transmitted to the brake resistor if the brake transistor
is short-circuited.
WARNING/ALARM 28, Brake check failed:
Brake resistor fault: the brake resistor is not connected/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°F +9°F [95°C +5°C]. The temperature fault cannot be
reset until the temperature of the heatsink is below 158°F +9°F [70°C
+5°C].
The fault could be:
- Ambient temperature too high
- Too long motor cable
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.
6-6
Brake Resistor (ohm)
) and the intermedi-
Trip
[2] has been selected in
, the adjustable frequency drive cuts
MG.33.AG.22 - VLT
VLT ® AutomationDrive FC 300 Instruction
Turn off the adjustable frequency drive and check motor phase W.
ALARM 33, Inrush fault:
Too many power-ups have occurred within a short time period. See the
General Specifications
chapter for the allowed number of power-ups
within one minute.
WARNING/ALARM 34, Fieldbus communication fault:
The serial communication bus on the communication option card is not
working correctly. Please check the parameters associated with the mod-
ule and make sure the module is properly inserted in slot A of the drive.
Check the wiring for serial communication bus.
WARNING/ALARM 36, Mains failure:
This warning/alarm is only active if the supply voltage to the adjustable
frequency drive is lost and par. 14-10
Possible correction: check the fuses to the adjustable frequency drive.
ALARM 37, Imb of sup volt:
There is a current imbalance between the power units
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Manual
Line Failure is NOT set to OFF.