Danfoss VLT AutomationDrive FC 302 Programming Manual page 220

Troubleshooting
Troubleshooting
•
The affected parameter must be set to a valid
value.
WARNING/ALARM 22, Hoist mechanical brake
Report value shows what kind it is.
0 = The torque ref. was not reached before time out
(Parameter 2-27).
1 = Expected brake feedback not received before time out
(Parameters 2-23, 2-25).
WARNING 23, Internal fan fault
The fan warning function is an extra protective function
5 5
that checks if the fan is running/mounted. The fan warning
can be disabled in 14-53 Fan Monitor ([0] Disabled).
For the D, E, and F Frame filters, the regulated voltage to
the fans is monitored.
Troubleshooting
•
Check for proper fan operation.
•
Cycle power to the frequency converter and
check that the fan operates briefly at start-up.
•
Check the sensors on the heat sink and control
card.
WARNING 24, External fan fault
The fan warning function is an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in 14-53 Fan Monitor ([0] Disabled).
Troubleshooting
•
Check for proper fan operation.
•
Cycle power to the frequency converter and
check that the fan operates briefly at start-up.
•
Check the sensors on the heat sink and control
card.
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 frequency converter is still
operational, but without the brake function.
Troubleshooting
•
Remove power to the frequency converter and
replace the brake resistor (see
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 intermediate circuit voltage and
the brake resistance value set in 2-16 AC brake Max.
Current. The warning is active when the dissipated braking
power is higher than 90% of the brake resistance power. If
[2] Trip is selected in parameter 2-13 Brake Power
Monitoring, the frequency converter trips when the
dissipated braking power reaches 100%.
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VLT AutomationDrive FC 301/302 Programming Guide
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 frequency converter 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
•
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check 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 falls below a defined heatsink temperature.
The trip and reset points are different based on the
frequency converter power size.
Troubleshooting
Check for the following conditions.
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•
•
•
•
•
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Remove power from the frequency converter and check
motor phase U.
ALARM 31, Motor phase V missing
Motor phase V between the frequency converter and the
motor is missing.
Remove power from the frequency converter and check
motor phase V.
ALARM 32, Motor phase W missing
Motor phase W between the frequency converter and the
motor is missing.
Remove power from the frequency converter and check
motor phase W.
ALARM 33, Inrush fault
Too many power-ups have occurred within a short time
period. Let the unit cool to operating temperature.
WARNING/ALARM 34, Fieldbus communication fault
The fieldbus on the communication option card is not
working.
MG33MI02 - Rev. 2013-11-20
Remove power to the frequency converter and
remove the brake resistor.
Ambient temperature too high.
Motor cable too long.
Incorrect airflow clearance above and below the
frequency converter.
Blocked airflow around the frequency converter.
Damaged heatsink fan.
Dirty heat sink.