Danfoss VLT AutomationDrive FC 302 Service Guide

a communication error between the power card and the
control card.
Check the alarm log for the report value associated with
this warning.
If the report value is 1, there is a hardware problem with 1
of the fans. If the report value is 11, there is a communi-
cation problem between the power card and the control
card.
Fan troubleshooting
•
Cycle power to the drive and check that the fan
operates briey 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).
•
In parallel drive systems, check the brake parallel
connections.
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.
WARNING
OVERHEATING RISK
A surge in power can cause the brake resistor to
overheat and possibly catch re. Failure to remove power
to the drive and remove the brake resistor can cause
equipment damage.
Troubleshooting
•
Remove power to the drive.
•
Remove the brake resistor.
•
Troubleshoot the short circuit.
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. The temperature fault does not reset until the
temperature drops below a
dened heat sink temperature.
The trip and reset points are dierent based on the drive
power size.
Troubleshooting
Check for the following conditions:
•
Ambient temperature too high.
•
Motor cable too long.
•
Incorrect airow clearance above and below the
drive.
•
Blocked airow around the drive.
•
Damaged heat sink fan.
•
Dirty heat sink.
For drives in enclosure sizes D and E, this alarm is based
on the temperature measured by the heat sink sensor
mounted inside the IGBT modules.
Troubleshooting
•
Check fan resistance.
•
Check soft charge fuses.
•
Check IGBT thermal.
ALARM 30, Motor phase U missing
Motor phase U between the drive and the motor is
missing.
Troubleshooting Service Guide
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Danfoss VLT AutomationDrive FC 302 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 302
Category	DC Drives
Language	English