Honeywell SmartVFD HVAC2 Applications Manual page 47

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Fault
code
Fault name
29
Thermistor fault
34
Internal bus
communication
35
Application fault
41
IGBT
Overtemperature
50
Analog input select
20% - 100%
(selected signal
range 4 to
or 2 to 10 V)
51
External fault
Table 15. Fault codes
The thermistor input of option board
has detected increase of the motor
temperature.
Ambient interference or defective
hardware.
Application is not working properly.
Overtemperature alarm is issued when
the IGBT switch temperature exceeds
230 °F (110 °C)
Current at the analogue input is < 4mA;
Voltage at the analogue input is < 2 V.
control cable is broken or loose.
20 mA
signal source has failed.
Digital input fault. Digital input has
been programmed as external fault
input and this input is active.
Possible cause
47
Correcting actions
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).
If the fault re-occur, contact the
distributor near to you.
Contact the distributor near to
you.
Check loading.
Check motor size.
Make identification run.
Check the current loop circuitry.
Remove the external device
fault.
31-00108—07

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