HCR1200-EDII
Electrical Systems
Engine starting circuits
Serial numers for 1354xxx
Contents
1. Electrical Equipment for Engine Starting Circuits
1-1ࠉPower and Fuses ...........................................................................................................ࠉ2
1-2ࠉStarting Motor ................................................................................................................ࠉ3
1-3ࠉBattery Relay .................................................................................................................ࠉ3
1-4ࠉAir Heater Relay and Air Inlet Heater ............................................................................ࠉ3
1-5ࠉStarting Switch ...............................................................................................................ࠉ4
1-6ࠉStarter Relay ..................................................................................................................ࠉ4
1-7ࠉAlternator .......................................................................................................................ࠉ4
1-8ࠉPower Off Delay Timer ..................................................................................................ࠉ4
1-9ࠉAir Pressure Release Valve ............................................................................................ࠉ4
2. Engine Starting Circuits
2-1ࠉStarting Switch On .........................................................................................................ࠉ5
2-2ࠉStarting Engine ..............................................................................................................ࠉ6
2-3ࠉAfter Starting Engine ......................................................................................................ࠉ7
2-4ࠉStopping Engine ...........................................................................................................ࠉ8
3. Engine Control Circuits
3-1ࠉManual Throttle Control .................................................................................................ࠉ9
3-2ࠉAuto Throttle Control ....................................................................................................ࠉ11
3-3ࠉEmergency Shutdown Control .....................................................................................ࠉ15
3-4ࠉDiagnostic Lamps ........................................................................................................ࠉ16
4. Accessory Circuits
4-1ࠉLights ...........................................................................................................................ࠉ17
4-2ࠉHorns ...........................................................................................................................ࠉ17
4-3ࠉWarning Lamps ...........................................................................................................ࠉ18
4-4ࠉGauges .......................................................................................................................ࠉ23
1
1. Electrical Equipment for Engine Starting Circuits
1-1 Power and Fuses
PC1 Line
Power for electrical system, starting switch, back-up power for engine ECM and radio. If the
F7 fuse is blown, the engine is not able to start.
PS1 Line
Power for PLCs, angle indicators (optional).
P1 Line
Power for engine ECM, lights, horns, warning lamps and gauges. If the F1 fuse is blown, lose
those controls. If it is blown while the engine is running, the engine will shut off.
P2 Line
Power for solenoid valves, indicators, buzzers and drifter hour meter (optional). If the F2 fuse
is blown, lose those controls.
P3 Line
(P03)
Power for switches and solenoid valves of the rod changer. If the F3 fuse is blown, lose those
controls.
P4 Line
Power for wiper motors, room light and radio. If the F4 fuse is blown, lose those controls.
P5 Line
Power for air conditioner. If the F5 fuse is blown, lose those controls.
P6 Line
Power for additional lights (optional) and 3-D angle indicators (optional). If the F6 fuse is
blown, lose those controls.
1
2
3
F 7 (15A)
PC
4
5 6 7
8 9
10
11
12 13 14
15
16
17 18 19
20 21
22
23
24
78
PC1
ESA
GT
ENR
1
PC01
B
PC00
BR
101
From 5-86
R1 R2
ACC
From 5-85
107 A016
PC01
C
102
P2
F 3 (15A)
P3
F 4 (15A)
P4
F 5 (30A)
P5
F 6 (15A)
P6
PC01
103
DC
/
DC
104
B
106
SR1
R
R
PC01
PBER1
109
ENR
1
165
A9
C
154
AOT
ESA
A8
111
ERZ
G
ENR
2
ENR
2
LSER1
110
LSER2
166
G
PC01 B
104
ENR
2
PD022
PS1
S
M
P1
F 2 (15A)
ENR
1
108
B
F 1 (30A)
186
112
GT
ESA
LT
AOT
RT
KT
ST
1
SOL
AO
S
E
Fig.1
2
Air Pressure Release Valve
Stop Solenoid Operating Signal
Hyd. Oil Heat Control Timer
Air Pressure Release Timer
Rod Changer Control Timer
DC DC Converter
Fuse
Lamp test
Engine Running Signal
Power Off Delay Timer
Alternator
Engine Starting Signal
StDrter Relay
Starting Switch
Air Inlet Heater
Air Heater Relay
Starting Motor
Battery Relay
Battery
NC
1-2 Starting Motor
The starting motor (address 2) drives the flywheel to crank the engine. It consists of starter
solenoid and motor.
1-3 Battery Relay
The battery relay (address 2) is a main switch to provide power from the battery to the circuits.
1-4 Air Heater Relay and Air Inlet Heater
The air heater relay (address 7) and air inlet heater (address 5) aid in start-up of the engine. It
is controlled by signals of the engine ECM based on the inlet manifold temperature.
There are two phases of air inlet heater operation; pre-heat (after key on and before cranking)
and post heat (just a successful of engine start).
࣭Pre-heat
When the inlet manifold temperature is below 0ࢎC [32ࢎF] at key on, the ECM will turn on
the heater and pre-heat lamp. If operators start the engine during pre-heating, the heater
will turn off to allow maximum current to be used by the starting motor.
The pre-heat time is shown in Fig.2.
35
Pre-heat time (sec.)
30
25
20
15
10
5
0
-40
-30
-20
-10
0
10
20
30
40 F°
-40
-34.4
-28.8
-23.3
-17.7
-12.2
-6.6
-1
4.4 ࢎC
Inlet manifold temperature
Fig.2
࣭Post heat
After a successful of engine start, the ECM will turn on the heater for a maximum of 300
seconds and it is cycled on a schedule based on the inlet manifold temperature at key on.
3
1-5 Starting Switch
The starting switch (address 9) activates the circuits. The table 1 shows the contact capacity
and conduction state of the terminals.
Terminal
Switch position
+($7
2))
21
67$57
10A
10A
10A
BR ACC R1
R2
C
2A
Contact capacity
B
20A
(H)
(O)
(R)
(HS)
Table 1
1-6 Starter Relay
The starter relay (address 11) provides high current to the starter solenoid of the starting motor
for starting engine. After starting engine, the relay will break the connection between batteries
and the starter solenoid to prevent motor damage.
1-7 Alternator
The alternator (address 13) produces electrical power and supplies current to the circuits. The
buildup of alternator voltage is used to control the starter relay.
1-8 Power Off Delay Timer
The power off delay timer (address 15) is used to hold the battery current to the circuits for 5
seconds after the starting switch is turned off.
1-9 Air Pressure Release Valve
The air pressure release valve (address 78) is used to aid in start-up of the engine. It reduces the
compressor load by releasing pressure in the receiver tank during engine starting.
4
2. Engine Starting Circuits
2-1 Starting Switch On
1) When the starting switch (address 9) is turned to the ON position, switch contact connects B
and BR terminal. The battery current flows through the starting switch contact to the coil of the
timer GT (address 15) and relay ESA (address 16). When the relay coils are energized, NO
contacts of the timer GT (address 5) and relay ESA (address 3 and 24) will close.
2) With the relay contacts closed, current flows to the coil of the battery relay (address 2),
causing its contact to close. This connects the battery and each circuit to supply power.
3) If the engine stop switches PB-ER1/LS-ER1/LS-ER2 (address 24) are not pressed and the
relay ERZ is not activated, current flows to the coil of the relay ST1, causing its NO contacts
(address 5-95) to close. With the contacts closed, the engine ECM is powered.
4) When the inlet manifold temperature is below 0ࢎC [32ࢎF], the ECM will activate the heater
relay (address 7).
Terminal
B
Switch position
HEAT
OFF
ON
START
1-1
2
3
4
5
10A
10A
10A
BR ACC R1
R2
C
9
11
2A
Contact capacity
20A
(H)
(O)
(R)
(HS)
6 7
8
10
15 16
24
5-95
F 7 (15A) PC1
PC
ESA
GT
F 1 (30A)
PC01
B
BR
R1 R2
C
PC00
PBER1
101
From 5-86
ACC
P1
109
102
LSER1
ENR
1
LSER2
110
From 5-85
PC01
ST1
107 A016
108
166
103
105
39
E.C.M
ESA
S
111
104
SR1
ERZ
R
PC01
GT
ESA
ST
1
Engine Running Signal
Stop Solenoid Operating
Signal
B
104
Power Off Delay Timer
PC01
B
M
112
C
S
E
Starter Relay
Starting Switch
Air Inlet Heater
Air Heater Relay
Battery Relay
Starting Motor
Battery
NC
Fig.3
5
2-2 Starting Engine
When the starting switch is turned to the start position, switch contact connects B and C
terminal. Current flows to the coil of the starter relay (address 11), causing its contacts to
close. With the contacts closed, battery voltage is delivered to the starter solenoid (address 2)
and starter motor rotates to crank the engine. ࠉ
Terminal
Switch position
1
2
10A
10A
10A
BR ACC R1
R2
C
8 9
10
B
BR
R1 R2
C
2A
Contact capacity
B
20A
HEAT
OFF
ON
START
(H)
(O)
(R)
(HS)
3
4
5 6 7
ESA
GT
11
15 16
F 7 (15A) PC1
PC
PC01
PC00
101
ACC
ENR
1
PC01
108
103
from ECM
104
SR1
R
PC01
B
104
M
C
GT
ESA
Engine Running Signal
PC01 B
Power Off Delay Timer
S
102
S
E
Fig.4
6
Starter Relay
Starting Switch
Air Heater Relay
Air Inlet Heater
Battery Relay
Starting Motor
Battery
NC
2-3 After Starting Engine
1) After the engine started, the alternator (address 13) generates electricity. When buildup of
alternator voltage reaches 12V, the relay ENR1 and ENR2 (address 12) are energized.
2) When the relay ENR1 is energized, the NC contacts (address 10) open. Current stop flowing
to the starter relay, causing its contact to open. Thus the starting motor stop operation. The
starting motor will not operate while the engine is running.
3) When the relay ENR2 is energized, the NO contacts (address 23 and 78) close, causing the
timer AOT, RT (address 22), KT (address 23) and the solenoid valve AO (address 78) to be
energized.
4) The contacts of the timer AOT (address 78) open 30 seconds after the relay coil is energized.
The NC contact of the relay AO (address 78) remains closed during timing, causing the
solenoid valve AO to be activated, releasing pressure in the receiver tank.
5) When the hydraulic oil temperature is below 25ࢎC [77ࢎF], the hydraulic oil preheat control
will automatically start after preset time of the timer KT (address 23) has passed (2 minutes).
Terminal
Switch position
HEAT
OFF
ON
START
2
3
4
5 6
7
8 9
10A
10A
10A
BR ACC R1
R2
C
2A
Contact capacity
B
20A
(H)
(O)
(R)
(HS)
10
11
12
PC
13
22
23
F 1 (30A)
PC01
78
P1
ENR
2
B
BR
R1 R2
C
ENR
2
Contacts open 154
in 30 sec.
102
ACC
165
PC01
108
103
B
106
104
R
SR1
R
PC01
G
PC01 B
B
104
M
186
G
ENR
1
C
ENR
2
AOT
RT
KT
SOL
AO
S
E
Hyd. Oil Heat Control Timer
2 min
Rod Changer Control Timer
Alternator
30 sec
Engine Starting Signal
Starter Relay
Starting Switch
Air Inlet Heater
Air Heater Relay
Starting Motor
NC
Air Pressure Release Timer
NC
Air Pressure Release Valve
from ECM
S
AOT
ENR
1
Fig.5
7
2-4 Stopping Engine
1) When the starting switch is turned off, switch contact disconnect B and BR terminal. The relay
ESA (address 16) is de-energized, causing its NO contacts (address 3 and 24) to open.
2) With the contacts opened, current to the coil of the relay ST1 is cut off, causing its NO contacts
(address 5-95) to open. Current to the engine ECM is cut off, causing the engine to shut off.
3) The NO contact of the timer GT (address 5) remains closed for 5 seconds, leave the battery
relay energized and continue supplying power to the circuits.
Terminal
Switch position
2
3
4
B
10A
10A
R2
C
20A
(H)
(O)
(R)
(HS)
HEAT
OFF
ON
START
1
10A
BR ACC R1
2A
Contact capacity
5 6 7
8 9
10
11
15 16
24
5-95
F 7 (15A) PC1
PC
ESA
GT
Contacts open
in 5 sec.
PC01
F 1 (30A) P1
B
BR
R1 R2
C
PC00
PBER1
101
ACC
109
102
LSER1
ENR
1
LSER2
ST1
110
PC01
108
166
103
from ECM
S
105
39
E.C.M
ESA
111
104
SR1
ERZ
R
PC01
112
M
GT
C
ESA
ST
1
Stop Solenoid Operating
Signal
104
Engine Running Signal
PC01 B
B
S
E
Fig.6
8
Key Switch Input
Power Off Delay Timer
Starter Relay
Starting Switch
Air Heater Relay
Air Inlet Heater
Battery Relay
5 sec
Starting Motor
Battery
NC
3. Engine Control Circuits
3-1 Manual Throttle Control
The engine speed changes as table 2 by turning the throttle switch (address 70-74).
Throttle
position
Revolution
(min-1)
Output voltage (V)
(A109)
Ϩ
1250
0-1
ϩ
1600
1-2
Ϫ
1800
2-3
ϫ
2200
3-4
Ϭ
2500
4-5
Table 2
5-70 71 72 73 74
75
76
77 78
79
80 81
82
83
84
85 86
87 8889
90
91
92
93
94
95
97
PC
P
ST1
A010
ࢫࣟࢵࢺ࣏ࣝࢪࢩ࣮ࣙࣥ࣎ࢻ
1
2
3
4
5
A101 A102 A103 A104 A105
5V
AUX-IN A-IN A-OUT P-OUT GND
A117
A107
8
15
5
15
A108 A109
A010
3
4
1
1
2
23
A012
PL1
(RL)
PL2
(OL)
PL3
(WL)
A001
43
A002
44
A004
50
25
105
39
E.C.M
4
40
42
24
25
28
02
34
A012 A109 A108
107 A016
A003 A013 A015 A015
46
47
37
A022
A023 A024
158
CS- CS- CS- CS- CSSP1 SP2 SP3 SP4 SP5
MG1
39
NC
Key Switch Input
Display
Fuel Level Sensor
Lamp Check Switch
Start Lamp (Pre-heat)
Diagnostic Lamp
Heater Relay
Stop Lamp
Battery
Engine Throttle Control 2
Engine Throttle Control 1
Throttle Switch
Ϩ ϩ Ϫ ϫ Ϭ
Fig.7
9
Throttle
switch
Ϩ
ϩ
Ϫ
ϫ
Ϭ
$
$
$
$
$
ϩ
Ϫ
ϫ
Relay
8.15
Voltage
Regulation
Circuit
Ϭ
66(0
$
$
PLC control
Engine ECM
Relay
5.15
$
$
1250$/
(&2120<
66(0
PLC control
Throttle Position Board
Fig.8
10
3-2 Auto Throttle Control
The engine speed rises automatically by the following conditions.
࣭Impact switch SW-PH(0.09) is on if the interlock system is not working.
࣭Flow switch SN-BF(3.05) is off.
The engine speed in auto throttle can be selected from 1600, 1800, 2200 and 2500 min-1 by
changing switch SS-EM and SS-EM2 on the throttle position board.
SS-EM
position
SS-EM2
position
NORMAL
ECONOMY
Revolution
(min-1)
2500
II
1600
III
1800
IV
2200
Table 3
11
A) Normal Operation
ENGINE
SPEED
When throttle signals are received,
current flows to the coil of the output
relay 8.15 and 5.15, causing current
from engine ECM (#A108) to be
grounded through the relay contact.
This increases the engine speed.
2500min-1
Engine speed
in manual
TIME
Fig.9
Throttle
switch
Ϩ
ϩ
Ϫ
ϫ
Ϭ
$
$
$
$
$
ϩ
Ϫ
ϫ
Relay
8.15
Voltage
Regulation
Circuit
Ϭ
66(0
$
$
PLC control
㸦Flushing ON㸧
Engine ECM
Relay
5.15
$
$
1250$/
PLC control
㸦Impact ON㸧
(&2120<
66(0
Throttle Position Board
Fig.10
12
B) Economy Operation
ENGINE
SPEED
At the following conditions, the engine speed
can be selected from 1600, 1800, 2200 min-1
by changing switch SS-EM2.
2200 min-1
1800 min-1
Switch SS-EM: ECONOMY position
Impact: ON
1600 min-1
When the impact signal is inputted, current
flows to the coil of the output relay 5.15,
causing one of the voltage regulation circuits
to be grounded through the relay contact.
The engine speed rises to the specified
speed that is selected by SS-EM2.
Minimum
speed
TIME
Alternative
Fig.11
Throttle
switch
Ϩ
ϩ
Ϫ
ϫ
Ϭ
$
$
$
$
$
ϩ
Ϫ
ϫ
Relay
8.15
Voltage
Regulation
Circuit
Ϭ
66(0
$
$
PLC control
(Flushing ON)
Engine ECM
Relay
5.15
$
$
1250$/
PLC control
(Impact ON)
(&2120<
66(0
Throttle Position Board
Fig.12
13
C) Super Economy Operation
When the switch SS-EM is in economy
position and drilling condition is as follows,
the engine speed rises to the maximum to
increase air volume regardless of the
position of the switch SS-EM2.
ENGINE
SPEED
PLQ
Impact OFF
PLQ
Economy
operation
speed
࣭Flushing ON
࣭Impact OFF
PLQ
PLQ
Current flows to the coil of the output relay
8.15, causing current from engine ECM
(#A108) to be grounded through the relay
contact. This increases the engine speed to
the maximum. In the above condition, the
relay 5.15 does not operate.
Minimum
speed
TIME
Fig.13
Throttle
switch
Ϩ
ϩ
Ϫ
ϫ
Ϭ
$
$
$
$
$
ϩ
Ϫ
ϫ
Relay
8.15
Voltage
Regulation
Circuit
Ϭ
66(0
$
$
PLC control
(Flushing ON)
Engine ECM
Relay
5.15
$
$
1250$/
PLC control
(Impact ON)
(&2120<
66(0
Throttle Position Board
Fig.14
14
3-3 Emergency Shutdown Control
When one of the following conditions exist, the relay ST1 (address 1-24) will be de-energized,
causing its NO contacts (address 5-95) to open. As a result, the engine shuts off automatically.
࣭When the emergency push buttons are pressed.
࣭When the hydraulic oil volume is below 130 litters [34.3 gal.].
(Hyd. oil tank capacity : 220 litters [58.1 gal.], the NO contact of the output relay 2.00
(address 4-40) will close.)
࣭When the compressor discharged air temperature reaches 120±2ࢎC [248±3.6ࢎF].
(the NO contact of the output relay 2.00 (address 4-40) will close.)
࣭When the engine oil pressure is low.
(Approx. less than 104kPa : according to the engine speed, by ECM control)
࣭When the coolant temperature reaches 111ࢎC [231.8ࢎF]. (by ECM control)
࣭When the engine speed reaches 2800 min-1. (By ECM control)
1-24
5-95
4-40
P1
P2
PBER1
2
00
109
LSER1
275
110
LSER2
166
Contacts open in
normal condition
ST1
105
39
E.C.M
ESA
111
ERZ
112
ST
1
Contacts close in
normal condition
ERZ
NC
Emergency Stop Signal
Stop Solenoid Operation
Signal
NC
Fig.15
15
3-4 Engine Diagnostic Lamps
1. Stop Lamp (red)
When serious problems occur in the engine, the stop lamp (address 84) will be turned on.
When the active faults are detected, the stop lamp will blink to indicate the fault codes.
2. Diagnostic Lamp (yellow)
When the active faults are detected, the diagnostic lamp (address 86) will blink to indicate
the fault code same as the stop lamp.
3. Pre-heat Lamp (white)
When the inlet manifold temperature is below 0ࢎC [32ࢎF] at key on, the pre-heat lamp
(address 89) will be turn on and preheat the engine.
4. Lamp check switch
In case several of the faults exist, lamp check switch (address 88) can be switched next or
previous fault indication.
For flash codes, refer the operation manual.
82
83
84
85 86
87 8889
90
91
92
93
94
95
97
P
ST1
A010
1
PL1
(RL)
PL2
(OL)
PL3
(WL)
A001
43
A002
44
A004
50
25
105
39
E.C.M
4
28
40
42
24
25
02
34
A012 A109 A108
107 A016
A003 A013 A015 A015
23
46
47
37
A022
A023 A024
158
MG1
39
Fig.16
16
Key Switch Input
Display
Fuel Level Sensor
Lamp Check Switch
Start Lamp (Pre-heat)
Diagnostic Lamp
Heater Relay
Stop Lamp
NC
4. Accessory Circuits
28
29
30
31
32
4-1 Lights
When the switch SS-WL1 (address 28) is
turned on, two head lights (four lights for
W1300 cab) will come on.
SS
WL1
SS
WL2
116
117
WL
WL
WL
Tail Lights (2)
WL
WL
Head Lights (4)
Head Light Switch
WL
Tail Light Switch
When the switch SS-WL2 (address 32) is
turned on, two tail lights will come on.
Fig.17
4-2 Horns
37
38
When the push botton PB-HR (address 38) is
pressed, two horns will sound.
PB
H01
HL
HH
Horns
Horn Switch
120
Fig.18
17
4-3 Warning Lamps
The address from 52 to 75 are the warning lamp circuits. Those lamps will come on when the
following signals are detected.
࣭When the hydraulic return filters are clogged.
࣭When the compressor and engine air cleaner elements are clogged.
࣭When the compressor discharged air temperature is high.
࣭When the hydraulic oil temperature is low.
࣭When the hydraulic oil temperature is high.
࣭When the hydraulic oil level is low.
࣭When voltage of the alternator is low.
52
53
54
55
ROF
EA
AT
TL
130
131
56
62
63
64
65
66
67
68
69
70
71
72
73
74
75
P1
128
129
PL2
(RL)
140
MD231
3
06
07
08
09
PL3
(RL)
141
PL4
(RL)
142
160
129
130
131
SN
AT
T1
ENR2
144
153
PL8
(OL)
PL9
(RL)
162
From 4-51
131
138
TL
LT
284
167
SN
EA
TL
10
132
SN
ROF
161
EA
143
From 66
128
ROF
LT
OFT
132
AT
OFT
To 56
T2
HM
PL6
(OL)
SN
OFT
PL7
(OL)
Fig.19
18
Charge
Hyd. Oil Level Low
Air Cleaner Lamp
Hyd. Oil Filter Lamp
Impact Hour meter (Optional)
Hyd. Oil Level Switch
Self-latching
Hyd. Oil Level Switch
Hyd. Oil Level Low
Hyd. Oil Temp. High
Discharged Air Temp. High
Lamp Test
Thermo Switch (L)
Self-latching
Thermo Switch (H)
Thermo Switch (L)
Discharged Air Temp. Switch
Air Cleaner Indicator
Hyd. Oil Filter Indicator
NC
࣭Lamp Test
When the starting switch is turned to the on position, current from P1 line flows to ground
through diodes and the NC contacts of the timer LT (address 63 and 71). The warning lamps
will come on to check the operation of lamps. Since battery current flows through the starting
switch to the coil of the timer LT (address 17), the timer contacts will open in 5 seconds to turn
off the warning lamps.
9
10
17
63
64
65
66
67
68
69
70
71
72
73
74
75
P1
PC1
Contacts
OFT opens in 5 sec.
EA
ENR2
144
153
PL8
(OL)
PL9
(RL)
PC00
PL3
(RL)
141
PL4
(RL)
142
160
161
162
143
Contacts opens 138
in 5 sec.
167
LT
LT
132
AT
OFT
To 56
PL7
(OL)
Air Cleaner
Hyd. Oil Return Filter
Hyd. Oil Level Switch
Self-latching
Hyd. Oil Level Low
Hyd. Oil Level Switch
Hyd. Oil Temp. High
Discharged Air Temp. High
Lamp Test
NC
Lamp Test Timer
NC
PL6
(OL)
SN
OFT
Charge
BR
PL2
(RL)
140
Starting Switch
TL
Hyd. Oil Temp. Low
B
ROF
LT
Fig.20
19
࣭Hydraulic Oil Return Filter
52
53
54
55
56
71
72
P1
When the differential pressure between
inlet and outlet of the oil filter reaches
275±27 kPa, the indicator switch
SN-ROF (address 52) is turned on and
make its contact. The relay ROF is
energized, causing the NO contacts
(address 72) to close. Current flows to
the warning lamp PL6 and it comes on.
LT
ROF
ROF
128
160
161
MD231
3
06
07
08
09
10
128
SN
ROF
PL6
(OL)
࣭Air Cleaner Element
52
Hydraulic Oil Return
Filter Lamp
Hydraulic Oil Return
Filter Indicator
NC
Fig.21
53
54
55
56
71
73
P1
When the airflow resistance (Pressure
drop) of the air cleaner reaches
6.23±0.57 kPa (for engine), 7.47±0.57
kPa (for compressor), the indicator
switch SN-EA (address 53) is turned on
and make its contact. The relay EA is
energized, causing the NO contacts
(address 73) to close. Current flows to
the warning lamp PL7 and it comes on.
LT
EA
EA
129
160
162
MD231
3
06
07
08
09
10
129
SN
EA
PL7
(OL)
Air Cleaner Lamp
Air Cleaner Indicator
NC
Fig.22
20
࣭Discharged Air Temperature High
54
55
56
63
65
P1
When the compressor discharged air
temperature reaches 120±2ࢎC
[248±3.6ࢎF], the temperature switch
SN-AT (address 54) is turned off and
opens its contact. The relay AT is
de-energized, causing the NC contacts
(address 65) to close. Current flows to
the warning lamp PL2 and it comes on.
AT
130
PL2
(RL)
140
MD231
3
08
09
10
130
Contact closes in
normal condition
138
Contact opens in
normal condition
167
AT
SN
AT
Discharged Air
Temperature High
Discharged Air
Temperature Switch
NC
Fig.23
࣭Hydraulic Oil Temperature Low
56
62
71
74
P1
LT
TL
TL
131
160
MD231
3
08
09
10
131
131
144
TL
T1
PL8
(OL)
Hyd. Oil Temp. Low
Thermo Switch (L)
Self-latching
NC
Thermo Switch (L)
When hydraulic oil temperature is below
25±3ࢎC [77±5.4ࢎF], the contact of
the thermo switch L (address 55) is
open. Since the NC contact of the relay
TL (address 74) remains closed, current
flows to the warning lamp PL8 and it
comes on.
55
Fig.24
21
54
࣭Hydraulic Oil Temperature High
55
56
63
66
P1
When the hydraulic oil temperature
reaches 87±3ࢎC [188±5.4ࢎF], the
thermo switch H (address 56) is turned
on and make its contact. Current flows
to the warning lamp PL3 (address 66)
and it comes on.
PL3
(RL)
141
MD231
3
08
09
10
138
132
132
LT
T2
Hyd. Oil Temp. High
Lamp Test
Thermo Switch (H)
NC
Fig.25
࣭Hydraulic Oil Level Low
67
68
P1
When the hydraulic oil in the hydraulic
tank decreases below 130 L [34.3 gal.] ,
the hydraulic oil level switch SN-OFT
(address 67) is turned on and make its
contact. Current flows to the warning
lamp PL4 and it comes on. At the same
time, the relay OFT (address 68) is
energized, causing its NO contacts to
close. Once the relay contacts closed,
current keep flowing to ground through
the relay contacts regardless of the state
of the switch contact. Therefore, the
warning lamp PL4 keeps lighting unless
the starting switch is turned off.
OFT
PL4
(RL)
142
143
138
Contact opens in
normal condition
OFT
SN
OFT
Fig.26
22
Hydraulic Oil Level Switch
Self-holding
Hydraulic Oil Level Low
Hydraulic Oil Level Switch
NC
12
࣭Alternator Voltage Low
75
13
F 1 (30A)
PC01
P1
When the starting switch is turned on,
current flows through the contacts of the
relay ENR2 (address 75) to ground,
causing the warning lamp PL9 to come
on. In case alternator voltage drops, the
relay ENR2 is de-energized, causing its
NC contact (address 75) to close.
Current flows to the lamp and it comes
on.
ENR2
106
NOTE : The relay ENR1 and ENR2 are
12V specification.
B
R
153
G
G
ENR
1
ENR
2
PL9
(RL)
Charge
Alternator
Engine Starting Signal
NC
Fig.27
79
80
81
82
P1
The temperature gauges indicate the
hydraulic oil and compressor discharged
air temperature in an analog. The
gauges read electrical resistance of the
sensor or sending unit with changing
temperature.
B
B
T
T
E
E
155
157
Discharged Air
Discharged Air
Hyd. Oil Temp. Sensor
NC
Hyd. Oil Temp. Gauge
4-4 Gauges
Fig.28
23
Hydraulic Crawler Drill
HCR1200-EDII
Electrical System
Engine Starting Circuits
Published 㸸Aug. 2008
Revised
㸸Dec. 2010
Sep. 2011
Jun. 2013
Furukawa Rock Drill Co, Ltd.
All rights reserved
Address: 5- 3, 1-chome, Nihonbashimuromachi, Chuoku,
Tokyo, 103 - 0027, Japan.
Phone: 81-3-3231-6982
Fax: 81-3-3231-6993