Danfoss VLT Decentral Drive FCD 302 Operating Manual page 70

Troubleshooting
ALARM 16, Short-circuit
There is short-circuiting in the motor or on the motor
terminals.
Turn off the frequency converter and remove the short-
circuit.
WARNING/ALARM 17, Control word timeout
There is no communication to the frequency converter.
The warning is only active when parameter 8-04 Control
Timeout Function is NOT set to [Off].
If parameter 8-04 Control Timeout Function is set to [Stop]
and [Trip], a warning appears and the frequency converter
ramps down until it trips, while giving an alarm.
Parameter 8-03 Control Timeout Time could possibly be
increased.
WARNING/ALARM 22, Hoist Mechanical Brake
The report value shows what kind it is. 0=The torque ref.
was not reached before timeout. 1=There was no brake
7 7
feedback before timeout.
WARNING 23, Internal fan fault
The fan warning function is an extra protection function
that checks if the fan is running/mounted. The fan warning
can be disabled in parameter 14-53 Fan Monitor (set to [0]
Disabled).
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 frequency converter still works, but
without the brake function. Turn off the frequency
converter and replace the brake resistor (see
parameter 2-15 Brake Check).
WARNING/ALARM 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, based
on the resistance value of the brake resistor
(parameter 2-11 Brake Resistor (ohm)) and the intermediate
circuit voltage. The warning is active when the dissipated
braking power is higher than 90%. If [2] Trip has been
selected in parameter 2-13 Brake Power Monitoring, the
frequency converter cuts out and issues this alarm, when
the dissipated braking power is higher than 100%.
WARNING/ALARM 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 frequency converter is still able to
run. However because the brake transistor has short-
circuited, substantial power is transmitted to the brake
resistor, even when it is inactive.
Turn off the frequency converter and remove the brake
resistor.
This alarm/ warning can also arise due to overheating of
the brake resistor. Terminals 104 to 106 are available as
brake resistor, with Klixon inputs.
68
®
VLT Decentral Drive FCD 302
ELECTRICAL HAZARD
There is a risk of substantial power being transmitted to
the brake resistor if the brake transistor is short-
circuited. Death, severe injury, or damage can occur.
Keep clear from the brake resistor and the electrical
connections.
WARNING/ALARM 28, Brake check failed
Brake resistor fault: the brake resistor is not connected/
working.
ALARM 29, Drive over temperature
The cut-out temperature of the heat-sink is 95 °C +5 °C.
The temperature fault cannot be reset, until the
temperature of the heatsink is below 70 °C ±5 °C.
The fault could be:
•
•
ALARM 30, Motor phase U missing
Motor phase U between the frequency converter and the
motor is missing.
Turn off the frequency converter and check motor phase U.
ALARM 31, Motor phase V missing
Motor phase V between the frequency converter and the
motor is missing.
Turn off the frequency converter and check motor phase V.
ALARM 32, Motor phase W missing
Motor phase W between the frequency converter and the
motor is missing.
Turn off the frequency converter and check motor phase
W.
ALARM 33, Inrush fault
Too many power ups have occurred within a short time
period. See chapter 8.2 General Specifications for the
allowed number of power ups within 1 minute.
WARNING/ALARM 34, Fieldbus communication fault
The fieldbus on the communication option card is not
working correctly. Check parameters associated with the
module and check the wiring for fieldbus.
WARNING/ALARM 36, Mains failure
This warning/alarm is only active if the supply voltage to
the frequency converter is lost and parameter 14-10 Mains
Failure is NOT set to [Off]. Possible correction: check the
fuses to the frequency converter
ALARM 37, Phase imbalance
There is a current imbalance between the power units
ALARM 38, Internal fault
When this alarm arises, it can be necessary to contact the
Danfoss supplier. Some typical alarm messages:
Danfoss A/S © 05/2016 All rights reserved.
WARNING
Ambient temperature too high
Too long motor cable
MG04F402