Troubleshooting:
Check connections on the serial communication
cable.
Increase
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 ref. was not reached before timeout.
1 = There was no brake feedback before timeout.
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).
Troubleshooting
Check fan resistance.
Check 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
14-53 Fan Monitor
([0] Disabled).
Troubleshooting
Check fan resistance.
Check 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 adjustable frequency drive is still
operational but without the brake function. Remove power
to the adjustable frequency drive and replace the brake
resistor (see
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
is higher than 90% of the brake resistance power. If
[2] Trip
is selected in
2-13 Brake Power Monitoring
, the adjustable
frequency drive will trip when the dissipated braking
energy reaches 100%.
WARNING
There is a risk of substantial power being transmitted to
the brake resistor if the brake transistor is short-circuited.
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.
Remove power to the adjustable frequency drive and
remove the brake resistor.
This alarm/warning could also occur should the brake
resistor overheat. Terminals 104 and 106 are available as
brake resistors Klixon inputs, see section
Brake Resistor
Temperature Switch
in the Design Guide.
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 will not reset until the
temperature falls 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.
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.
For the D, E, and F Frame sizes, this alarm is based on the
temperature measured by the heatsink sensor mounted
inside the IGBT modules. For the F Frame sizes, this alarm
can also be caused by the thermal sensor in the rectifier
module.
Troubleshooting
Check fan resistance.
Check soft charge fuses.
IGBT thermal sensor.
ALARM 30, Motor phase U missing
Motor phase U between the adjustable frequency drive
and the motor is missing.
Remove power from the adjustable frequency drive and
check motor phase U.
Warnings and Alarms
VLT
®
Automation Drive D-Frame
Instruction Manual
MG34U222 - VLT
®
is a registered Danfoss trademark
8-7
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