Electric System for 9S
Excavators
2017/10/23 – 10/27
Medellin, Colombia
Cluster Types R220LC-9S
Type2
Type1
Common with 9 Series
1
Power/Start/Charging R220LC-9S
Diode
Fusible Power
Link Relay
Battery
Battery Fusible Master Master Start
Fuse Box Switch
Relay Link Switch Key
MCU Engine neutral ?
Anti
ALT Level Restart
Relay RMS
Resistor
Fuel Cut
Start
Alt off
Relay Solenoid
Start
Motor
: Charging route when engine runs
Preheat & Glow plug relays are not shown
2
Fuse Arrangement R220LC-9S
From Battery
From Battery Relay
From Power Relay
3
B+ Power Circuit R220LC-9S
4
Key On(Power Relay) Circuit R220LC-9S
Battery -> Fuse#1 -> Power Relay -> Fuse Box
Fuse#8 -----> Camera
Cluster
Camera
Fuse#9 -----> MCU
Fuse#10 ----> MCU
Fuse#11 ----> Switch Panel
Fuse#12 ----> Cassette Radio
Fuse#13 ----> Fuel Cut Off Solenoid
5
Key On(Battery Relay) Circuit R220LC-9S
Battery -> Battery Relay -> Fuse Box
Fuse#14 ----> Service Tool
DC Converter
Fuse#15 ----> Work Lamp Relay Work Lamp
Fuse#16 ----> Cabin Lamp Relay Cabin Lamp
Fuse#17 ----> Washer Pump
Wiper Motor Controller
Fuse#18 ----> Head Lamp Relay Head Lamp
Fuse#19 ----> Fuel Heater Relay Fuel Heater
Fuse#20 ----> Anti Restart Relay Start Relay
Fuse#21 ----> Horn Relay Horn
6
Key On(Battery Relay) Circuit R220LC-9S
Battery -> Battery Relay -> Fuse Box
Fuse#22 ----> AC Compressor Relay AC Compressor
AC Controller
Fuse#23 ----> Safety Solenoid Safety Switch
Fuse#24 ----> Seat Heater
Spare Switch
Fuse#25 ----> Breaker Switch (RCV)
Breaker Switch
Quick Coupler Switch Quick Coupler Solenoid
Buzzer
Solenoids : Power Max., Arm Regen., Travel Hi
Travel Buzzer
Breaker Relay Breaker Solenoid
Fuse#26 ----> Cigar Lighter
7
Key On(Battery Relay) Circuit R220LC-9S
Battery -> Battery Relay -> Fuse Box
Fuse#27 ----> Econo Switch Switch Lamp
Overload Switch Switch Lamp
Beacon Lamp Switch Switch Lamp
Beacon Lamp
Fuse#28 ----> Attachment Solenoids : Safety, Pressure, Conflux
Fuse#29 ----> Preheat Relay Preheat Relay Preheater
Fuse#30 ----> Fuel Pump
Fuse#31 : Spare
8
Engine Starting Circuit R220LC-9S
MCU cuts ground line of anti-restart
relay a few seconds after engine
starting to protect starter motor
9
Charging Circuit R220LC-9S
10
Hydraulic Related Electric R220LC-9S
Cluster2
* Cluster Type1
- Boom up PS
- Swing PS
EPPR Valve - Arm Reg. Sol.
missing - Fuse Box
- MCU
11
R220LC-9S
MCU
Battery
Relay
Fusible Link
Engine
Harness
R220LC-9S Cluster1 : #8700 -
Frame Harness, 1/2
12
R220LC-9S Cluster1 : #8700 -
RH Side Harness
Frame Harness, 2/2 R220LC-9S
LH Console Harness
Aircon Harness
LH Console
Harness
Master Switch
Fuse
Box
13
R220LC-9S Cluster1 : #7168 - R220LC-9S
Engine Harness
Engine Harness 14
R220LC-9S Cluster1 : #7168 -
Engine Harness
15
Main Control Unit (MCU) R220LC-9S
Two connectors on MCU : CN51, CN52 for Cluster1
16
Main Control Unit (MCU) R220LC-9S
Two connectors on MCU : CN51, CN52 for Cluster1
17
Flow of Refrigerant R220LC-9S
Compressor Condenser
HPG
Receiver
Drier
* Dual pressure switch at condenser outlet hose
* Duct Sensor (Thermistor) on evaporator
LPG HPL
LPL
Expansion
Evaporator Valve Expansion Valve
18
Air Conditioner System R220LC-9S
Fuse#22
Fuse#5
Head Lamp Relay
FATC only
19
Fan Speed Control R220LC-9S
FUSE 5
FUSE 22
Pressure switch at condensor
COMP. RELAY
outlet hose
Same as
Semi-Auto
A/C
system (2~27 Kg/cm2: ON)
POWER TR
DRAIN
GATE
SOURCE
20
Aircon & Heater Unit R220LC-9S
1 2 3 4
No Description
1 Blower Unit
2 Heater Unit
3 Evaporator Unit
4 Filter Unit
APTC is not available for S series
Defrost Outlet A/C Outlet Nozzle
Outside
Cooled Air Air
A/C Door
Heater/Defrost
Door
APTC Rec. Air
Blower
Heater Core Evaporator
Hot Air
Heater Outlet
21
Aircon & Heater Unit R220LC-9S
③
② ④
①
1. Fan & Motor
2. APTC (N/A for S series)
3. Water Valve
⑤
4. Heater Core
5. Actuator, Temp. (A)
⑨ 11
6. Actuator, Intake (B)
7. Air Filter
8. Evaporator Core
⑥
Wiring Ass’y
9. Resistor (Power TR)
10. Ambient/Incar Sensors
11. Relay, Blower
⑩
Duct Sensor (Thermistor)
⑦
on Evaporator (not shown)
⑧
22
Duct Sensor R220LC-9S
Resistance of thermistor changes by temperature. In other words thermistor can measure
temperature by reading resistance.
Duct sensor measures temperature at evaporator core, which could be frozen and prevent air flow.
Compressor is turned off in case measured temperature is too low.
High Characteristics (Temp.-Resistance-Output voltage)
Resistance Resistance Resistance
Low Temp. Temp. Temp.
Off On (㏀) (㏀) (㏀)
-30℃ 116.80 0℃ 27.62 30℃ 8.03
Compressor On : 4.0 ± 0.5℃ -20℃ 70.44 10℃ 18.06 40℃ 5.81
Compressor Off : 0.5 ± 0.25℃ -10℃ 43.35 20℃ 12.11 50℃ 4.14
* 23.24 ㏀ at 4℃
Thermistor Wire
Sponge Connector
Clip
23
Sensors R220LC-9S
CAB Rear,
outside
HVAC room,
inside
Ambient & Incar Sensors
ⓐ ⓑ
※ Ambient sensor check : measure voltage between ⓐ, ⓑ and compare it with below value
When temp. increases, the resistance decreases (Thermistor )
Resistance Voltage Resistance Voltage Resistance Voltage
Temp. Temp. Temp
㏀)
(㏀ (V) ㏀)
(㏀ (V) ㏀)
(㏀ (V)
-20℃ 271.21 10℃ 58.79 3.31 30℃ 24.26 2.24
-10℃ 158.18 4.01 20℃ 37.31 2.77 40℃ 16.13 1.75
0℃ 95.09 3.80 25℃ 30.00 50℃ 10.95
24
A/C System Schematic R220LC-9S
Dual Pressure S/W
Receiver Relay,
Ambient Sensor Compressor
Drier Compressor
Incar Sensor
Fuse#5
Fuse#22
A/C
Sensor
Duct
Operator Evaporator
Controller
Power Relay,
FET Blower
Fan Speed
25
Flow Actuators R220LC-9S
26
Dual Pressure Sensor R220LC-9S
For low pressure For high pressure
ON
OFF
2.0±
±0.2 2.1±
±0.3 27±
±0.2 32±
±0.2 (Kg/cm2) R134a
2.0±
±0.2 2.1±
±0.3 21±
±0.2 27±
±0.2 (Kg/cm2) R12
9(S) Series
7 Series
Condenser
RD
27
Receiver Drier R220LC-9S
* Reservoir of excess refrigerant * Separation of bubble * Removal of water and foreign material
1) 7 Series 2) 9 Series
Filter Out
In
O-
Ring
R/Drier
R/D Condenser
Tank
Cartri
dge
28
Expansion Valve R220LC-9S
* Decrease of pressure and temperature of refrigerant through throttling
* Adjustment of refrigerant volume to evaporator according to cooling load
P2 = P1 + PF
PB + TL = PL + PF Evap.
Angle Type Box Type
PB
Comp.
TL
PL Cond.
From Evap. To Comp.
To Evap.
From R/D
FS
Ball
29
