108 vacon
fault tracing
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
9
Fault
code
Fault
Possible cause
Correcting measures
8
System fault
S7 = Charging
switch
S8 = No power
to driver card
S9 = Power unit
communication
(TX)
S10 = Power
unit
communication
(Trip)
S11 = Power
unit comm.
(Measurement)
component failure
faulty operation
Note the exceptional Fault data
record. See 7.3.4.3.
Reset the fault and restart.
Should the fault re-occur, contact
the distributor near to you.
For local contacts, go to:
http://drives.danfoss.com/danfoss-
drives/local-contacts/
9
Undervoltage
S1 = DClink too
low during run
S2 = No data
from power
unit
S3 =
Undervoltage
control
supervision
DC-link voltage is under the voltage
limits defined in
most probable cause: too low a supply
voltage
inverter internal fault
a defective input fuse
the external charge switch is not
closed
In case of temporary supply voltage
break, reset the fault and restart the
inverter. Check the supply voltage. If
it is adequate, an internal failure has
occurred.
Contact the nearest distributor.
For local contacts, go to:
http://drives.danfoss.com/danfoss-
drives/local-contacts/
10
Input line
supervision
The input line phase is missing.
Check the supply voltage, the fuses
and supply cable.
11
Output phase
supervision
Current measurement has detected
that there is no current in one motor
phase.
Check motor cable and motor.
12
Brake chopper
supervision
No brake resistor installed
brake resistor is broken
brake chopper failure
Check brake resistor.
If the resistor is ok, the chopper is
faulty. Contact the distributor near
to you.
For local contacts, go to:
http://drives.danfoss.com/danfoss-
drives/local-contacts/
13
Inverter
undertemperat
ure
Heatsink temperature is under 10
C
14
Inverter
overtemperatu
re
Heatsink temperature is over 90
C or
77ºC (NX_6, FR6).
Overtemperature warning is issued
when the heatsink temperature
exceeds 85
C (72ºC).
Check the correct amount and flow
of cooling air.
Check the heatsink for dust.
Check the ambient temperature.
Make sure that the switching
frequency is not too high in relation
to ambient temperature and motor
load.
15
Motor stalled
Motor stall protection has tripped.
Check motor.
