Danfoss FC 300 Operating Instructions Manual page 59

Warnings and Alarms
15-43 Software Version
15-45 Actual Typecode String
15-49 SW ID Control Card
15-50 SW ID Power Card
15-60 Option Mounted
15-61 Option SW Version (for each option slot)
ALARM 16, Short circuit
There is short-circuiting in the motor or motor wiring.
Remove power to the frequency converter and repair the
short circuit.
WARNING/ALARM 17, Control word timeout
There is no communication to the frequency converter.
The warning will only be active when 8-04 Control Word
Timeout Function is NOT set to [Off].
If 8-04 Control Word Timeout Function is set to Stop and
Trip, a warning appears and the frequency converter ramps
down until it trips then displays an alarm.
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 frequency converter is still
operational but without the brake function. Remove power
to the frequency converter and replace the brake resistor
(see 2-15 Brake Check).
VLT ® AutomationDrive Operating
Instructions
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 frequency
converter will trip when the dissipated braking power
reaches 100%.
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 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.
Remove power to the frequency converter 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 inuputs, 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
frequency converter power size.
Troubleshooting
Check for the following conditions.
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.
®
MG33AM02 - VLT is a registered Danfoss trademark
WARNING
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 heatsink.
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