Danfoss VLT AQUA Drive FC 202 Operating Manual page 67

Maintenance, Diagnostics, a...
Fan troubleshooting
•
Cycle power to the drive and check that the fan
operates briefly at start-up.
•
Check for proper fan operation. Use parameter
group 43-** Unit Readouts to show the speed of
each fan.
Power card troubleshooting
•
Check the wiring between the power card and
the control card.
•
Power card may need to be replaced.
•
Control card may need to be replaced.
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation. If a short
circuit occurs, the brake function is disabled and the
warning appears. The drive is still operational, but without
the brake function.
Troubleshooting
•
Remove the power to the drive and replace the
brake resistor (refer to parameter 2-15 Brake
Check).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated as
a mean value over the last 120 s of run time. The
calculation is based on the DC-link voltage and the brake
resistor value set in parameter 2-16 AC brake Max. Current.
The warning is active when the dissipated braking power
is higher than 90% of the brake resistor power. If option [2]
Trip is selected in parameter 2-13 Brake Power Monitoring,
the drive trips when the dissipated braking power reaches
100%.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation, and if a
short circuit occurs, the brake function is disabled, and a
warning is issued. The drive is still operational, but since
the brake transistor has short-circuited, substantial power
is transmitted to the brake resistor, even if it is inactive.
Troubleshooting
•
Remove power to the drive and remove the brake
resistor.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Troubleshooting
•
Check parameter 2-15 Brake Check.
ALARM 29, Heat Sink temp
The maximum temperature of the heat sink has been
exceeded. This alarm is based on the temperature
measured by the heat sink sensor mounted inside the IGBT
modules. The temperature fault does not reset until the
temperature drops below a defined heat sink temperature.
The trip and reset points are different based on the drive
power size.
MG22A102
Operating Guide
Troubleshooting
•
•
•
•
ALARM 30, Motor phase U missing
Motor phase U between the drive and the motor is
missing.
WARNING
HIGH VOLTAGE
Drives contain high voltage when connected to AC mains
input, DC supply, or load sharing. Failure to use qualified
personnel to install, start up, and maintain the drive can
result in death or serious injury.
•
Troubleshooting
•
ALARM 31, Motor phase V missing
Motor phase V between the drive and the motor is
missing.
WARNING
HIGH VOLTAGE
Drives contain high voltage when connected to AC mains
input, DC supply, or load sharing. Failure to use qualified
personnel to install, start up, and maintain the drive can
result in death or serious injury.
•
Troubleshooting
•
ALARM 32, Motor phase W missing
Motor phase W between the drive and the motor is
missing.
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Check for the following conditions:
-
Ambient temperature too high
- Motor cable too long
- Incorrect airflow clearance above and
below the drive
- Blocked airflow around the drive
- Damaged heat sink fan
-
Dirty heat sink
Check fan resistance.
Check soft charge fuses.
Check IGBT thermal.
Disconnect power before proceeding.
Remove the power from the drive and check
motor phase U.
Disconnect power before proceeding.
Remove the power from the drive and check
motor phase V.
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