Sinclair ASC-18A, Service Manual

Page: 127 / 264

DC INVERTER U-MATCH AIR CONDITION MAINTENANCE
121
Tripping ◆
Tripping
If the switching
capacity can meet
the requirements?
Tripped once
energized
Tripped when
the compressor
is started?
Install the electric
switch according to the
capacity requirements
as specified in
operating instructions.
Check PFC board. Cut off the
power for 1 minute or reduce
the busbar voltage to 36V or
lower. Then, remove the
connection cable on PFC board
and use multimeter to measure
if P-N, or P-L1_2, or L1_2-N on
PFC board is short circuited.
Leakage current
is too high.
Please check for
moisture, or
replace the filter.
Short circuited?
The PFC module is damaged.
Replace the PFC module and check
if AC contactor is stuck. Meanwhile,
ensure that P-N is short circuited.
The possible reasons causing this
trouble include: ① The screws fixing
the module are not correctly
tightened; ② The AC contactor on
AC side in parallel to the recharging
resistor is stuck, and the transient
recharging current upon
energization is too high; ③ The input
voltage is too low; or ④ The cable
connection is wrong.
Check driver board. Cut off the
power for 1 minute or reduce
the busbar voltage to 36V or
lower. Then, remove the
connection cable on driver
board and use multimeter to
measure if P-N, or P-U, or P-V,
or P-W, or U-N, or V-N, or W-N
on driver board is short
circuited.
Short circuited?
If the front-end
AC contactor is
stuck?
If the insulation
on PFC inductor
winding is
damaged?
The system is
abnormal. Please check
the compressor
connections or winding
for short circuiting or
other troubles.
The AC contactor
is damaged.
Please replace
with a same type
of contactor.
Replace PFC
inductor
Check if the
cable
connection is
wrong
Record and
feed back
Leakage current
is too high.
Please check for
moisture, or
replace the filter.
PFC ON?
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
No
No
No
The IPM module is damaged.
Replace the driver board. The
possible reasons causing this
trouble include: ① The screws
fixing the module are not
correctly tightened; ② The
load is severely overloaded; or
③ The interference causes
short circuiting inside IPM
module.
No