Danfoss FC 302 Instruction Manual page 71

FC 300 Instruction Manual
overloaded by more than 100% for too long. Check
that the motor par. 1-24 is set correctly.
WARNING/ALARM 11
Motor thermistor over temp:
The thermistor or the thermistor connection is
disconnected. You can choose if you want the
adjustable frequency drive to give a warning or an
alarm when the counter reaches 100% in par. 1-90.
Check that the thermistor is connected correctly
between terminal 53 or 54 (analog voltage input)
and terminal 50 (+ 10 Volts supply), or between
terminal 18 or 19 (digital input PNP only) and
terminal 50. If a KTY sensor is used, check for
correct connection between terminal 54 and 55.
WARNING/ALARM 12
Torque limit:
The torque is higher than the value in par. 4-16 (in
motor operation) or the torque is higher than the
value in par. 4-17 (in regenerative operation).
WARNING/ALARM 13
Over Current:
The inverter peak current limit (approx. 200%
of the rated current) is exceeded. The warning
will last approx. 8-12 sec., then the adjustable
frequency drive trips and issues an alarm. Turn
off the adjustable frequency drive and check if the
crankshaft can be turned and if the motor size
matches the adjustable frequency drive.
If extended mechanical brake control is selected,
trip can be reset externally.
ALARM 14
Ground fault:
There is a discharge from the output phases to
ground, either in the cable between the adjustable
frequency drive and the motor or in the motor itself.
Turn off the adjustable frequency drive and
remove the ground fault.
ALARM 16
Short-circuit:
There is short circuiting in the motor or
on the motor terminals.
Turn off the adjustable frequency drive and
remove the short circuit.
WARNING/ALARM 17
Control word timeout:
There is no communication to the adjustable
frequency drive.
Troubleshooting
The warning will only be active when par.
8-04 is NOT set to OFF.
If par. 8-04 is set to Stop and Trip, a warning
appears and the adjustable frequency drive ramps
down until it trips, while giving an alarm.
par. 8-03 Control word Timeout Time could
possibly be increased.
WARNING 25
Brake resistor short-circuited:
The brake resistor is monitored during operation. If
it short circuits, the brake function is disconnected
and the warning appears. The adjustable frequency
drive still works, but without the brake function.
Turn off the adjustable frequency drive and replace
the brake resistor (see par. 2-15 Brake Check.)
ALARM/WARNING 26
Brake resistor power limit:
The power transmitted to the brake resistor is
calculated as a percentage, as a mean value over
the last 120 s, on the basis of the resistance value of
the brake resistor (par. 2-11) and the intermediate
circuit voltage. The warning is active when the
dissipated braking energy is higher than 90%. If Trip
[2] has been selected in par. 2-13, the adjustable
frequency drive cuts out and issues this alarm when
the dissipated braking energy is higher than 100%.
WARNING 27
Brake chopper fault:
The brake transistor is monitored during operation
and if it short circuits, the brake function disconnects
and the warning comes up. The adjustable frequency
drive is still able to run, but since the brake transistor
has short circuited, substantial power is transmitted
to the brake resistor, even if it is inactive.
Turn off the adjustable frequency drive and
remove the brake resistor.
is short circuited.
ALARM/WARNING 28
Brake check failed:
Brake resistor fault: the brake resistor is
not connected/working.
MG.33.A4.22 - VLT is a registered Danfoss trademark
Warning: There is a risk of substantial
power being transmitted to the brake
resistor if the brake transistor
71