Fisher FSAI-CP-90BE3 Service Manual page 63

Energize and
switch on
IPM protection
occurs after the
machine has run for
a period of time?
Please confirm:
1. If the indoor and
outdoor heat
exchangers are
dirty? If they are
obstructed by other
objects which affect
the heat exchange
of indoor and
outdoor unit.
2. If the indoor and
outdoor fans are
working normally?
3. If the environment
temperature is too
high, resulting in
that the system
pressure is too high
and exceeds the
permissible range?
4. If the charge
volume of
refrigerant is too
much, resulting in
that the system
pressure is too
high?
5. Other conditions
resulting in that the
system pressure
becomes too high.
Refer to the
Electrical Wiring
Diagram and check
if the connection
between AP1 and
COMP is loose and if
the connection order
is correct.
If the connection
between AP1 and
COMP is unsecure
or the connection
order is wrong?
Use ohmmeter to
measure the resistance
between the three
terminals on compressor
COMP, and compare the
measurements with the
compressor resistance on
Service Manual.
Use ohmmeter to
measure the resistance
between the two
terminals of compressor
COMP and copper tube.
60
Use AC voltmeter
to measure the
Yes
voltage between
terminal L and N
on the wiring
board XT)
Voltage between
Yes
the two ends of celectrolytic
capacitor is
higher than
250V
No
Stop the unit and
disconnect the power
supply. Then, check
the connection of
capacitor C2
according to Electrical
Wiring Diagram.
Remove the wires
on the two ends of
capacitor C2. Then,
use capacitance
meter to measure
the capacitor C2.
Verify as per the
Parameters Sheet.
If capacitor
C2 is failed?
No
If there is any
abnormality
described above?
No
Connect the control panel
AP1 and compressor
Yes
COMP correctly according
to the Electrical Wiring
Diagram. Then, energize
and start the unit.
If the
resistance is
normal?
Resistance higher
than 500M ?
Replace the
control panel
If the voltage
between terminal L
and N on wiring
board XT is within
210VAC~250VAC?
Yes
Restart the unit. Before
protection occurs,
use DC voltmeter to
measure the voltage
between the two
ends of electrolytic
capacitor on control
panel AP1
The connection
of capacitor C2
is loose.
No
Stop the unit and
disconnect the power
supply. Wait 20 minutes,
or use DC voltmeter to
measure the voltage
between the two ends of
capacitor C2, until the
voltage is lower than 20V
Replace the capacitor
Yes
C2. Then, energize
and start the unit.
Replace the
control panel AP1
Take corrective actions
Yes according to Technical
Service Manual, and
then energize and start
the unit.
Replace the
control panel AP1
If the unit can
normally?
Replace the
No
compressor
COMP
No
Yes
AP1
END
Check the supply
voltage and
No
restore it to
210VAC~250VAC
If the unit can
No
work
normally?
Reconnect the
capacitor C2 according
to Electrical Wiring
Yes
Diagram. Then,
Restart the
unit.
If the unit can
No
work normallv?
If the unit can
work normally?
No
If the unit can
work normally?
No
Yes
work
Installation and Maintenance
Service Manual
Yes
Yes
Yes
Yes