Danfoss VLT AutomationDrive FC 301 Instruction Manual page 46

Maintenance, Diagnostics an...
WARNING/ALARM 22, Hoist mechanical brake
Report value shows what kind it is.
0 = The torque reference was not reached before timeout
(2-27 Torque Ramp Up Time).
1 = Expected brake feedback not received before timeout
(2-23 Activate Brake Delay, 2-25 Brake Release Time).
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 14-53 Fan Monitor ([0] Disabled).
For adjustable frequency drives with DC fans, there is a
feedback sensor mounted in the fan. If the fan is
commanded to run and there is no feedback from the
sensor, this alarm appears. For adjustable frequency drives
with AC fans, the voltage to the fan is monitored.
7 7
Troubleshooting
•
Check for proper fan operation.
•
Cycle power to the adjustable frequency drive
and check that the fan operates briefly at start-
up.
•
Check the sensors on the heatsink 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).
For adjustable frequency drives with DC fans, there is a
feedback sensor mounted in the fan. If the fan is
commanded to run and there is no feedback from the
sensor, this alarm appears. For adjustable frequency drives
with AC fans, the voltage to the fan is monitored.
Troubleshooting
•
Check for proper fan operation.
•
Cycle power to the adjustable frequency drive
and check that the fan operates briefly at start-
up.
•
Check the sensors on the heatsink 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 adjustable frequency drive is still
operational but without the brake function.
Troubleshooting
•
Remove the power to the adjustable frequency
drive and replace the brake resistor (see
2-15 Brake Check).
44
Instruction Manual
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
energy is higher than 90% of the brake resistance power. If
option [2] Trip is selected in 2-13 Brake Power Monitoring,
the adjustable frequency drive trips when the dissipated
braking energy 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 adjustable frequency 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
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check 2-15 Brake Check.
ALARM 29, Heatsink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault does not reset until the
temperature drops below a defined heatsink temperature.
The trip and reset points are different based on the
adjustable frequency drive power size.
Troubleshooting
Check for the following conditions.
ALARM 30, Motor phase U missing
Motor phase U between the adjustable frequency drive
and the motor is missing.
Troubleshooting
Danfoss A/S © Rev. 09/2014 All rights reserved.
•
Remove power to the adjustable frequency drive
and remove the brake resistor.
•
Ambient temperature too high.
•
Motor cable too long.
•
Incorrect airflow clearance above and below the
adjustable frequency drive.
•
Blocked airflow around the adjustable frequency
drive.
•
Damaged heatsink fan.
•
Dirty heatsink.
•
Remove the power from the adjustable frequency
drive and check motor phase U.
MG33AP22