LG GR-429GVCA QVJA Service Manual ▷ View online
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3. OLP (OVER LOAD PROTECTOR)
1) Definition of OLP
(1) OLP (OVER LOAD PROTECTOR) is attached to the
Hermetic Compressor and protects the Motor by cutting
off current in Compressor Motor in case of over-rising
temperature by Bimetal in the OLP.
off current in Compressor Motor in case of over-rising
temperature by Bimetal in the OLP.
(2) When over-voltage flows to Compressor motor, the
Bimetal works by heating the heater inside the OLP,
and the OLP protects Motor by cutting off current which
flows to the Compressor Motor.
and the OLP protects Motor by cutting off current which
flows to the Compressor Motor.
2) Role of the OLP
(1) The OLP is attached to the Hermetic Compressor used
for the Refrigerator and Show Case and prevents the
Motor Coil from being started in the Compressor.
Motor Coil from being started in the Compressor.
(2) Do not turn the Adjust Screw of the OLP in any way for
normal operation of the OLP.
(Composition and connection Diagram of OLP)
(Composition and connection Diagram of OLP)
CIRCUIT DIAGRAM
CONTACTING
POINT
COVER
BIMETAL
CONTACTING
POINT
HEATER
TERMINALS
ADJUST
SCREW
HEATER
BIMETAL
Figure 20
NOTE : 1. This is a basic diagram and specifications vary in different localities.
u
u
BEST
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u
u
BETTER
u
u
GOOD
1. COMPRESSOR AND ELECTRIC COMPONENTS
TROUBLESHOOTING (Mechanical Part)
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1
2
3
4
5
2
5
5
3
4
5
5
1
4
3
YES
YES
NO
YES
YES
NO
NO
5
YES
NO
YES
Power
Source.
Source.
Remove the Relay
Assembly from the
Compressor and measure
the voltage between
Terminal C of Compressor
and Terminals M or S of
Relay Assembly
Assembly from the
Compressor and measure
the voltage between
Terminal C of Compressor
and Terminals M or S of
Relay Assembly
No Voltage.
(Rating Voltage
±10%)?
±10%)?
Replace
Relay Assembly
Relay Assembly
Replace
Relay Assembly
Relay Assembly
O.K.
Advise the customer
to use a regular
Trans.
to use a regular
Trans.
Replace Compressor.
OLP works within
30 sec. in forcible
OLP operation by
turning instant power
on and off.
30 sec. in forcible
OLP operation by
turning instant power
on and off.
Components start in
the voltage of Rating
Voltage ±10% below.
the voltage of Rating
Voltage ±10% below.
Applied voltage isn't
in the range of Rating
Voltage ±10%.
in the range of Rating
Voltage ±10%.
Check the resistance
among M-C, S-C and
M-S in Motor
Compressor.
among M-C, S-C and
M-S in Motor
Compressor.
Check the resistance of
two terminals in PTC-
Starter.
two terminals in PTC-
Starter.
Check if applying
a regular OLP.
a regular OLP.
Measure minimum
starting voltage after 5
min. for balancing cycle
pressure and cooling the
PTC.
starting voltage after 5
min. for balancing cycle
pressure and cooling the
PTC.
Check the
resistance of
Motor
Compressor.
resistance of
Motor
Compressor.
Check the
resistance of
PTC-Starter.
resistance of
PTC-Starter.
Check OLP.
Check
starting state.
starting state.
2. RELAY ASSEMBLY (PTC AND OLP)
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L
N
T
3
2
2
M
C
S
M
C
S
YES
NO
Normal operation of
Compressor is
impossible or poor.
Compressor is
impossible or poor.
Separate the Relay
Assembly from
Compressor and measure
the resistance between M
and S with a Tester or
Whistone Bridge.
(Figure 21)
Assembly from
Compressor and measure
the resistance between M
and S with a Tester or
Whistone Bridge.
(Figure 21)
Separate the Relay
Assembly from the
Compressor and check the
resistance value between
two terminals of OLP with a
Tester. (Figure 22)
Assembly from the
Compressor and check the
resistance value between
two terminals of OLP with a
Tester. (Figure 22)
Observation value is
220V/50Hz : 22
220V/50Hz : 22
Ω
±30%
115V/60Hz : 6.8
Ω
±30%
240V/50Hz : 33
Ω
±30%
127, 220V/60Hz :
22
22
Ω
±30%
The resistance value is 0
or serveral hundreds
or serveral hundreds
Ω
.
The value is
∞
.
Check another
electric components.
electric components.
Replace Relay
Assembly.
Assembly.
Check another
electric
components.
electric
components.
Replace
Relay Assembly.
Relay Assembly.
Figure 21
Figure 22
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