NFO
Drives
AB
2021
201013
‐
2
Operating
and
Installation
Manual
39
Fault
message
Possible
fault types
Default setting
Fault description, other fault
parameters
Source of fault, action
Type of
fault
Error
Count
AC Fail
Fail
Alarm
Indication
Disable
Fail 10
Phase error, loss of AC supply.
One supply phase missing or too high
voltage difference between phases. Check
fuses and supply voltage.
Delay (
Delay
)
Default setting
Range
10.0 s
0.0 – 25.0 s
Temp Hi
Fail
Fail
1
Inverter heat sink temperature too
high.
Wait until inverter has cooled down. Check
inverter is installed so air can circulate
sufficiently. Check ambient temperature is
not too high.
PTC Temp
Fail
Alarm
Indication
Disable
Alarm 1
If using PTC function, the motor is
overheated, thermistor input limit
exceeded.
Let motor cool down.
Overload
Fail
Alarm
Indication
Disable
Alarm 0
The electronic motor overload
protection has tripped. The motor
connected has been overloaded for
too long.
Let motor cool down. Adjust settings if
necessary (parameters
Force Cool
and
Amb.Temp
)
Forced cooling (
Force Cool
)
Default setting
Range
0
0 – 3000
Ambient motor temperature
(
Amb.Temp
)
Default setting
Range
20
C
-20 – 45
C
Ain Fail
Fail
Alarm
Indication
Disable
Indication 2
Analogue setpoint input signal
outside range.
Open or short circuit in signal line to
analogue setpoint or
Ain Type
not set
correctly.
DC Low /
Trip
Fail
Fail 2
DC link voltage too low, or supply
is disconnected.
Power supply voltage too low. Check
inverter mains connection.
DC High
Fail
Fail
2
DC link voltage too high
Motor is regenerative with no brake chopper
resistance or with broken resistor.
Deceleration time too short. Mains supply
too high. Check inverter mains connections.
GND Fail
[S or R]
Fail
Alarm
Indication
Disable
Fail 0
Earth leak current in one or more
motor phases too high. S or R
indicates if in Stop or Run
Possible sources of faults depending on
motor operating case:
One or more output phase (U, V, W) is in
contact with the protective earth (PE) or
other external potential.
Short-circuit between some of the output
phases (U, V, W).
Open circuit in one or more outgoing
phases.
Resistance too high in any of the outgoing
phases, poor contact/loose contact in motor
or motor wiring.
Motor parameters faulty, autotuning not
performed.
Short Circ
Fail
Fail 2
Short-circuit between output
phases
Imagn Low
Fail
Alarm
Indication
Disable
Fail 2
Magnetising current in motor too
high or too low.
Cur Low
Fail
Alarm
Ind
Disable
Fail 2
Current in one or more motor
phases too low.
Cur High
Fail
Alarm
Ind
Disable
Fail 2
Current in one or more motor
phases too high.
Cur Limit
Fail
Alarm
Indication
Disable
Indication
10
Current limit has been reached.
Reduce acceleration ramp or check whether
parameter I-limit matches motor used. Alarm
will disappear when current falls within limit.
3006469-2022-04
