Adjustment; Compressor; Cccccccecccceceeeececceecceeeaeceeceseceeeeseceneceneeaeeenecaeecaecacecaecaaecaeeaaecaeseaesaeseaseaeseaesenseeseneeneeenes; To Remove The Cover Ptc Oui - LG LMX25964 Series Service Manual

4. ADJUSTMENT
4-1 COMPRESSOR
4-1-1 Role
The compressor intakes low temperature and low pressure
gas from the evaporator of the refrigerator and compresses
this gas to high-temperature and high-pressure gas. It then
delivers the gas to the condenser.
4-1-2 Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) Do not drop or handle carelessly.
(3) Keep away from any liquid.
If liquid such as oil or water enters the Cover PTC
Compressor may fail due to breakdown of their
insulating capabilities.
(4) Always use the Parts designed for the compressor and
make sure it is properly attached to the compressor.
Parts may appear physically identical but could have
different electrical ratings. Replace parts by part number
and model number. Use only approved substitute parts.
4-1-3 Remove the cover PTC
(1) Remove the Cover Back M/C
(2) Loosen two screws on comp base
(3) Use a L-shaped flap tool to pry off the cover
(4) Assembly in reverse order of disassembly
4-1-4 Compressor protection logic
« Since linear Comp conducts linear reciprocating motion,
we have protection logic for compressor, motor and PCB
as the below.
- Stroke. Trip
During the operation, if-stroke is above the target value,
decrease the target volt by 3V.
- Current Trip
Current trip is set in order-to protect compressor
mechanical part.and drive from the.overcurrent that-might
arise during the operation.
Check the current for-every 416.7zs and ifthe Trip
exceeds 1.86Arms more than three times at Comp ON,
forcibly.stop and _restart-six minutes later.
- Lock Piston Trip
if stroke is -under.5mm_even if the current is-more.than
14Arms, Take it-as 'piston lock' and restart after 2'30" of
Comp. OFF. Check the current and stroke for every
416.7 us.and if the condition fits more than. three times at
Comp ON, The Lock Point Trip occurs.
- 1PM fault-Trip
It occurs.if FO-signal received from IPM.is LOW. For
every 416.7ys, check whether FO signal is LOW. The trip
occurs. ifit.is found three times during the five
periods(83ms).
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