Danfoss VLT Decentral Drive FCD 302 Operating Manual page 49

VLT® Decentral Drive FCD 302
Operating Guide
6.8.13 WARNING/ALARM 17, Control Word Timeout
Cause
There is no communication to the drive. The warning is only active when parameter 8-04 Control Word Timeout Function is NOT set to
[0] Off.
If parameter 8-04 Control Word Timeout Function is set to [5] Stop and trip, a warning appears, and the drive ramps down to a stop and
shows an alarm.
Troubleshooting
• Check the connections on the serial communication cable.
• Increase parameter 8-03 Control Word Timeout Time.
• Check the operation of the communication equipment.
• Verify that proper EMC installation was performed.
6.8.14 WARNING/ALARM 22, Hoist Mechanical Brake
Cause
The value of this warning/alarm shows the type of warning/alarm.
0 = The torque reference was not reached before timeout (parameter 2-27 Torque Ramp Up Time).
1 = Expected brake feedback was not received before timeout (parameter 2-23 Activate Brake Delay, parameter 2-25 Brake Release
Time).
6.8.15 WARNING 23, Internal Fan Fault
Cause
The fan warning function is a protective function that checks if the fan is running/mounted. The fan warning can be disabled in
parameter 14-53 Fan Monitor ([0] Disabled).
For drives with DC fans, a feedback sensor is mounted in the fan. If the fan is commanded to run and there is no feedback from the
sensor, this alarm appears. For drives with AC fans, the voltage to the fan is monitored.
Troubleshooting
• Check for proper fan operation.
• Cycle power to the drive and check that the fan operates briefly at start-up.
• Check the sensors on the control card.
6.8.16 WARNING 25, Brake Resistor Short Circuit
Cause
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).
6.8.17 WARNING/ALARM 26, Brake Resistor Power Limit
Cause
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 dissipa-
ted braking power is higher than 90% of the brake resistor power. If option [2] Trip is selected in parameter 2-13 Brake Power Monitor-
ing, the drive trips when the dissipated braking power reaches 100%.
6.8.18 WARNING/ALARM 27, Brake Chopper Fault
Cause
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 the power to the drive and remove the brake resistor.
Danfoss A/S © | 2020.07
Maintenance, Diagnostics and
Troubleshooting
AQ267036816112EN-000101 / 130R0208 | 49