Danfoss VLT FC 102 Operating Instructions Manual page 72

Diagnostics and Troubleshoo...
Troubleshooting
•
Check the connections on the serial communi-
cation cable.
•
Increase parameter 8-03 Control Word Timeout
Time
•
Check the operation of the communication
equipment.
•
Verify a proper installation based on EMC
requirements.
WARNING/ALARM 22, Hoist mechanical brake
Report value shows what kind it is.
0 = The torque reference was not reached before timeout
(parameter 2-27 Torque Ramp Up Time).
1 = Expected brake feedback not received before timeout
(parameter 2-23 Activate Brake Delay, parameter 2-25 Brake
Release Time).
7 7
WARNING 23, Internal 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 parameter 14-53 Fan Monitor ([0]
Disabled).
Troubleshooting
•
Check the fan resistance.
•
Check the soft charge fuses.
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 parameter 14-53 Fan Monitor ([0]
Disabled).
Troubleshooting
•
Check the fan resistance.
•
Check the soft charge fuses.
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 the 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 parameter 2-16 AC brake
Max. Current. The warning is active when the dissipated
braking is >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%.
70
®
VLT HVAC Drive FC 102 Low Harmonic Drive
WARNING
If the brake transistor is short-circuited, there is a risk of
substantial power being transmitted to the brake
resistor.
WARNING/ALARM 27, Brake chopper fault
This alarm/warning could occur if the brake resistor
overheats. Terminals 104 and 106 are available as brake
resistors Klixon inputs.
NOTICE
This signal feedback is used by LHD to monitor the
temperature of the HI inductor. This fault indicates that
Klixon opened on the HI inductor at the active filter side.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check parameter 2-15 Brake Check.
ALARM 29, Heat Sink temp
The maximum temperature of the heat sink has been
exceeded. The temperature fault resets when the
temperature falls below a defined heat sink temperature.
The trip and reset points vary based on the frequency
converter power size.
Troubleshooting
Check for the following conditions.
•
•
•
•
•
•
For D, E, and F enclosures, this alarm is based on the
temperature measured by the heat sink sensor mounted
inside the IGBT modules. For the F enclosures, the thermal
sensor in the rectifier module can also cause this alarm.
Troubleshooting
•
•
•
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Troubleshooting
•
ALARM 31, Motor phase V missing
Motor phase V between the frequency converter and the
motor is missing.
Danfoss A/S © 04/2015 All rights reserved.
Ambient temperature too high.
Motor cables too long.
Incorrect airflow clearance above and below the
frequency converter.
Blocked airflow around the frequency converter.
Damaged heat sink fan.
Dirty heat sink.
Check the fan resistance.
Check the soft charge fuses.
Check the IGBT thermal sensor.
Remove the power from the frequency converter
and check motor phase U.
MG16I302