P. 63 - Chap. 9 Troubleshooting
G
B
V-F V-V Indication Possible cause Intervention
X X
L1 ON
L3 constant ON
DI indicates:
“Short-circ. Analog INPUT -
block”
Problems in the pressure /
temperature sensors or in
their electrical connections
Call Customer
Service Centre
X X
L1 ON
L3 ON flashing
DI indicates:
“Power
supply failure - block”
An interruption of the power
supply of the system has
occurred
Carry out the RESET
operation (ref. Par. 7.5) and
restart the machine
X X
L1 ON
L3 constant ON
DI indicates:
“Power supply phase
sequence err. - block”
Power supply phase
sequence error
Reverse two power phases
X X
L1 ON
L3 constant ON
DI indicates:
“No. starts/hr too high -
block”
The No of starts/hr tolerated
by the motor has been
exceeded
Wait for fault reset
9.2
The compressor has trouble starting up
V-F V-V Indication Possible cause Intervention
X X
Ambient temperature low Heat ambient
Low voltage Check voltage
VA
problems
Call Customer
Service Centre
Star - delta sequence
problems
Call Customer
Service Centre
X
X
Inverter problems
Call Customer
Service Centre
9.3
Pressure value lower than rated pressure
V-F V-V Indication Possible cause Intervention
X X
Pressure value on DI constant
(does not increase)
VA problems
Call Customer
Service Centre
Belts slipping
Call Customer
Service Centre
X
X
Variable pressure value on DI
but which does not reach the
minimum working threshold.
Motor speed of rotation remains
low.
Control unit mc
2
problems
Call Customer
Service Centre
Problems in the electrical
connections between
control unit mc
2
and inverter
Call Customer
Service Centre
X X
Pressure value on DI lower
than minimum operating
pressure
Air demand too high
Reduce no. of service points /
add compressors in parallel
Internal or external leaks
Check leaks
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