control keypad
vacon 79
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
7
Fault
code
Fault
Possible cause
Correcting measures
16
Motor over-
temperature
Motor overheating has been detected
by inverter motor temperature model.
Motor is overloaded.
Decrease the motor load.
If no motor overload exists, check
the temperature model parameters.
17
Motor
underload
Motor underload protection has
tripped.
Check the load.
18
Unbalance
S1 = Current
unbalance
S2 = DC voltage
unbalance
Unbalance between power modules in
paralleled power units.
Should the fault re-occur, contact
the distributor near to you.
For local contacts, go to:
http://drives.danfoss.com/danfoss-
drives/local-contacts/
22
EEPROM
checksum fault
Parameter save fault
faulty operation
component failure
Should the fault re-occur, contact
the distributor near to you.
For local contacts, go to:
http://drives.danfoss.com/danfoss-
drives/local-contacts/
24
Counter fault
Values displayed on counters are
incorrect
25
Microprocessor
watchdog fault
faulty operation
component failure
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/
26
Start-up
prevented
Start-up of the drive has been
prevented. Run request in ON when
new application is downloaded to the
drive.
Cancel prevention of start-up.
Remove Run request.
29
Thermistor
fault
The thermistor input of option board
has detected increase of the motor
temperature
Check motor cooling and loading
Check thermistor connection
(If thermistor input of the option
board is not in use it has to be short
circuited)
30
Safe Torque Off The input on OPTAF board has
opened.
Cancel Safe Torquee Off if this can
be done safely.
31
IGBT
temperature
(hardware)
IGBT Inverter Bridge overtemperature
protection has detected too high a
short term overload current
Check loading.
Check motor size.
32
Fan cooling
Cooling fan of the inverter does not
start, when ON command is given.
Contact the nearest distributor.
For local contacts, go to:
http://drives.danfoss.com/danfoss-
drives/local-contacts/
34
CAN bus
communication
Sent message not acknowledged.
Ensure that there is another device
on the bus with the same
configuration.