Doosan DX140LC, DX180LC Wiring Diagram

1Electrical System

SP001038

ELECTRICAL SYSTEMSP001038

Electrical

System

Edition 1

Electrical System

SP001038

Page 1

MEMO

Electrical System
Page 2

SP001038

SP001038

Page 3

Electrical System

Table of Contents

Electrical System

Safety Precautions ............................................... 7

Applicable Models ................................................ 7

Introduction........................................................... 9

Electrical Supply System .................................... 10

Engine Starting Circuit........................................ 12

Start Operation .............................................................. 12

After Start ...................................................................... 14

Engine Preheating System ................................. 16

Engine Stop ........................................................ 18

Charging System ................................................ 20

Monitoring System.............................................. 21

Instrument Panel ........................................................... 22

Monitoring System Schematic....................................... 24

Operation............................................................ 26

Instruments.................................................................... 26

Warning and Indicator Lights.............................. 28

Indication of Warning Lights .......................................... 28

Indication of Multifunction Gauge and

Letter Information Area.................................................. 29

Initial Operation .................................................. 31

Mode Selector Switch......................................... 31

Graphic Information Area Display....................... 32

Overview ....................................................................... 32

Main Menus for the Graphic Display Area..................... 33

Menu Selector Buttons .................................................. 33

Main Menu.......................................................... 34

Language ...................................................................... 34

Set Clock ....................................................................... 35

Filter/Oil Info .................................................................. 35

Adjust Display................................................................ 36

SP001038

Electrical System
Page 4

Set Password ................................................................ 37

Special Menu...................................................... 38

Entering/Accessing and Exiting/Escaping Menus ......... 38

Special Menu Selections ............................................... 39

Electronic Hydraulic Control System (e-EPOS).. 56

Control System Schematic ............................................ 56

Power Mode Control........................................... 58

Operation ....................................................................... 60

Power Mode Control - Circuit Diagram............... 62

Work Mode Control............................................. 64

Operation ....................................................................... 65

Work Mode Control - Circuit Diagram................. 66

Engine Control System....................................... 67

Engine Control Dial............................................. 68

Engine Control Circuit Diagram .......................... 69

Automatic Deceleration Control

(Auto Idle Control) .............................................. 70

Engine Overheat Protection System .................. 72

Power Boost Mode ............................................. 74

Operation ....................................................................... 74

Power Boost Control - Circuit Diagram ......................... 76

Automatic Travel Speed Control......................... 78

Automatic Travel Speed Control - Circuit Diagram ....... 80

Self-diagnostic Function .....................................81

e-EPOS Controller......................................................... 81

Air Conditioner System....................................... 83

Outline ........................................................................... 83

Internal and External Filters .......................................... 84

Air-Conditioning System Layout .................................... 86

Air Conditioner/heater Circuit Diagram.......................... 87

Air Conditioner/heater Unit ............................................ 88

Ambient Air Temperature Sensor .................................. 93

SP001038

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Electrical System

Sun Sensor.................................................................... 94

Control Panel................................................................. 94

Compressor ................................................................. 102

Receiver Dryer ............................................................ 102

Troubleshooting................................................ 103

Weight of R134a Gas Used In Machines ......... 105

Refrigerant System Repairs ............................. 106

Refrigerant Safe Handling Procedures........................ 106

Repair and Replacement Procedure ........................... 107

Refrigerant Recovery .................................................. 109

Vacuuming Refrigerant System................................... 109

Leakage Check ........................................................... 111

Refrigerant Charging ................................................... 111

Inspecting System For Leakage .................................. 113

Wiper System ................................................... 114

Wiper Circuit................................................................ 114

Wiper operation ........................................................... 115

Lighting System ................................................ 118

Lighting System Circuit Diagram ................................. 118

Kind of Light ................................................................ 119

Operation ..................................................................... 119

Audio Controller................................................ 120

Audio Controller Circuit Diagram................................. 120

MEMO

Electrical System
Page 6

SP001038

SP001038

Page 7

Electrical System

SAFETY PRECAUTIONS

APPLICABLE MODELS

The contents of this section apply to the following models and
serial number ranges.

CAUTION!

Follow all safety recommendations and safe shop practices
outlined in the front of this manual or those contained
within this section.

Always use tools and equipment that are in good working
order.

Use lifting and hoisting equipment capable of safely
handling load.

Remember, that ultimately safety is your own personal
responsibility.

MODEL SERIAL NUMBER RANGE

DX140LC 5001 and Up

DX180LC 5001 and Up

Page 8

SP001038Electrical System

SP001038

Page 9

Electrical System

INTRODUCTION

The electrical system for this equipment is DC 24 volts. The
rated voltage for all electric components is 24 volts with the
exception of the stereo and the air-conditioning control actuator.
The system contains two 12 volt batteries connected in series
and a three phase AC generator with a rectifier. The electric
wiring used in the system is easily identifiable by the insulator
color. The color symbols used in the electrical system are listed
in the following chart.

Electric Wire Color

NOTE: RW: Red wire with White stripe

R - Base Color, W - Stripe Color

NOTE: 0.85G: Nominal sectional area of wire core less

insulator = 0.85 mm

2

Symbol Color

W White

G Green

Or Orange

B Black

L Blue

Lg Light green

R Red

Gr Gray

P Pink

Y Yellow

Br Brown

V Violet

SP001038Electrical System

Page 10

ELECTRICAL SUPPLY SYSTEM

The electric power circuit supplies electric current to each
electric component. It consists of a battery, battery relay, starter
switch, circuit breaker, fusible link and fuse box.

The negative terminal of the battery is grounded to the vehicle
body.

Even when the starter switch (5) is in the "OFF" position, electric
current is supplied to the following components through battery
(1) o fusible link (3) o fuse box (6).

1. Terminal "1" of DC-DC converter (for memory backup of
stereo)

2. Terminal "B" of starter switch

3. Hour meter

4. Engine controller

5. Fuel feeder pump switch

6. Terminal "6" of wiper motor

7. Terminal "13" of wiper controller

8. Terminal "CN6-11" of instrument panel

9. Terminal "CN9-6" of air conditioner panel

10. Cabin light

When the starter switch (5) is in the "ON or START" positions,
the current flows from the battery (1) o fusible link (3) o fuse
box (6) o "B" terminal of starter switch (5) o "BR" terminal of
starter switch (5) o "BR" terminal of battery relay (2) which
activates the coil of the battery relay and the electric supply
system is energized.

When the battery relay's contacts are connected, all electric
devices can be operated.

While the engine is not running, the electric power for all electric
devices are supplied by the battery. Once the engine is started
the power is supplied from the alternator (7).

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Electrical System

TRIO DIODE

0.5 uF

8

START

ON

OFF

STARTER SWITCH CONNECTION

TML

PST

B BR R1 R2 C ACC

F+

F-

E

REG.

I(L)

FIELD

GRD

7

12V 100AH

R(I)

P(R)

B+

8

B(B+)

-

E

BR

4

B

12V 100AH

1

+ - +

2

A

6

R2

ACC

R1

B

BR

C

5

0.5G

3

FG007233

Figure 1 ELECTRIC POWER CIRCUIT DIAGRAM

Reference

Number

Description

1 Battery

2 Battery Relay

3 Fusible Link

4 Circuit Breaker

5 Starter Switch

6 Fuse Box

7 Alternator

8 Diode

Reference

Number

Description

SP001038Electrical System

Page 12

ENGINE STARTING CIRCUIT

Start Operation

When the starter switch is turned to the "START" position, the
"S" and "E" terminals of the starter controller (7) are connected.
At this time the contacts in the starter relay (8) are closed by the
current flow from the battery (1) o fusible link (3) ofuse box (6)
o "B" terminal of starter switch (5) o "C" terminal of starter
switch (5) o "30" terminal of starter relay (12) - "87a" terminal o
"C" terminal of starter relay (8) - "D" terminal o "S" terminal of
starter controller (7) - "E" terminal o ground.

When the contact point "B" and "PP" of starter relay (8) are
connected, the pinion gear of the starter (9) is pushed forward
and makes contact with the ring gear of the flywheel and the
internal contacts of the starter are connected. The current flows
from the battery (1) o "A" terminal of the battery relay (2) o "B"
terminal of the battery relay (2, Figure 3) o "B" terminal of the
starter (9). The starter motor is rotated and the engine is started.

If the instrument panel has the password function activated ,
input number should match the set number, otherwise the start
circuit closes and the engine does not start.

NOTE: If the security system is "LOCKED," a four-digit

password will be required to start the engine. If the
system is "UNLOCKED," no password will be
required and this display screen will not appear.

In the event the security system is locked, current
flows from battery (1)

o

fusible link (3) ofuse box

(6)

o

"B" terminal of starter switch (5) o "ACC"

terminal of starter switch (5)

o

"86" terminal of starter

relay (12)

o

"85" terminal of starter relay (12)

o

"CN1-15" terminal of e-EPOS (13) o ground. This
current flow causes the coil in starter relay (12) to be
activated, opening contacts at "87a" terminal. This
prevents starter relay (8) from functioning.

C

H

C

E

F

H

02/05 [MO] 11:30

E/G SPEED

0

RPM

FG001445

ENTER
PASSWORD

Figure 2

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Electrical System

TRIO DIODE

0.5 uF

CN1-15

TML

STARTER SWITCH CONNECTION

ON

START

OFF

PST

F-

E

GRD

R2BRB R1 ACCC

13

CN2-1

6

P(R)

R(I)

B(B+)

REG.

I(L)

F+

FIELD

B+

11

4

12

85 86

30

87a

87

P

N

B

C

BR

R2

R1

ACC

B

5

E

S

11

D

C B

PP

7 8

2

-10+ -

1

BR

E

B

A

+

3

A

B

C

9

FG007234

Figure 3 STARTER CIRCUIT (1) - WHILE STARTING

Reference

Number

Description

1 Battery

2 Battery Relay

3 Fusible Link

4 Circuit Breaker

5 Starter Switch

6 Fuse Box

7 Starter Controller

8 Starter Relay

9 Starter

10 Alternator

11 Diode

12 Starter Relay 2

13 e-EPOS Controller

Reference

Number

Description

SP001038Electrical System

Page 14

After Start

Once the engine has been started, the belt driven alternator (10)
generates a current.

The output generated by the alternator (10) is a square wave
pulse voltage through the "P" terminal and the frequency of the
pulse voltage is proportional to the rotation of the alternator.

The starter controller (7) monitors the frequency of the output
current. Once the frequency is equivalent to 500 rpm, it is
sensed and the connection between "S" and "E" terminals and
the connection between "B" and "PP" terminals are opened. As
a result the rotation of the starter (9) is stopped. Once the engine
is running, the starter (9) will not operate even if the starter
switch (5) is moved to the start position, preventing possible
damage to the starter.

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Electrical System

Operation of the Start Circuit (2) - Immediately After Start

FG007237

TRIO DIODE

0.5 uF

ACC

85 86

STARTER SWITCH CONNECTION

ON

START

TML

OFF

PST

BRB

CN1-15

ACCR2R1 C

R2

CN2-1

R1

B

C

BR

87

87a

P

30

B

E

N

S

C B

D PP

+- + -

E

B

BR

A

B

A

C

12

13

10

6

11

4

5

7

11

8

1

2

3

9

F-

E

GRD

P(R)

R(I)

I(L)

REG.

F+

B+

B(B+)

FIELD

igure 4 OPERATION OF START CIRCUIT (2) - IMMEDIATELY AFTER START

Reference

Number

Description

1 Battery

2 Battery Relay

3 Fusible Link

4 Circuit Breaker

5 Starter Switch

6 Fuse Box

7 Starter Controller

8 Starter Relay

9 Starter

10 Alternator

11 Diode

12 Starter Relay 2

13 e-EPOS Controller

Reference

Number

Description

SP001038Electrical System

Page 16

ENGINE PREHEATING SYSTEM

An air heater (8) is installed in the intake manifold of the engine.
When the starter switch (5) is turned "ON," the current flows
from the battery (1) o fusible link (3) o fuse box (6) o "B"
terminal of starter switch (5) o "BR" terminalof starter switch (5)
o "1-39" terminal of engine controller (12), causing current to
flow though "1-16" terminal of engine controller (12) o "C and
D" terminals of preheat relay (7) o "1-04" terminals of engine
controller (12) o ground.

This current flow causes the coil in preheat relay (7) to be
activated, closing contacts.

When the contacts of the preheat relay (7) are closed, the
heating coils of the air heating device (8) are heated by current
flowing from the battery (1) o battery relay (2) o preheat relay
(7) o air heater (8) o ground.

The duration of the heating cycle depends on the temperature of
engine coolant. The preheat indicator light in the instrument
panel (9) will turn "ON" during preheating cycle.

The preheat relay (7) is controlled by the engine controller (12)
and operates only at temperatures of 10°C (50°F) and below.

The longer the preheating period, the lower the temperature of
coolant is.

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Electrical System

(1)

12

1-07

1-13

D

+

H

ON

OFF

START

11

1-40

1-34,35

7

C

PREHEAT

L5

CN4-4,5,6

CN2-1

CN7-4,5,6

CN6-1,2

9

6

2

STARTER SWITCH CONNECTION

-

200A

B

TML

PST

B BR R1

-

1

+

R1

R2

ACC

B

C

BR

5

E

10

BR

B

ACCR2 C

- +

A

4

3

FG007137

Figure 5 ENGINE PREHEAT CIRCUIT

Reference

Number

Description

1 Battery

2 Battery Relay

3 Fusible Link

4 Circuit Breaker

5 Starter Switch

6 Fuse Box

7 Preheat Relay

8 Air Heater

9 Preheat Indicator Light

10 Diode

11 e-EPOS Controller

12 Engine Controller

Reference

Number

Description

SP001038Electrical System

Page 18

ENGINE STOP

When starter switch (5) is turned "ON" the engine controller (8)
is activated. The engine controller monitors and controls the
engine including the injector solenoid (9). It controls the fuel
deliver rate and the injection timing for each cylinder.

NOTE: There is an individual injector solenoid (9) for each of

the six cylinders. Only one soleniod is shown in
Figure 7.

When starter switch (5) is turned "OFF," the engine controller
stops suppling power to the injector solenoid (9). This stops fuel
from being injexted into the engine cylinder, thus stopping the
engine.

In the event that the engine can be shut down using the starter
switch (5), an emergency stop switch (10) is provided to shut
down engine. To activate the emergancy stop switch, move it to
the "I" (EMERGENCY STOP) position.

The emergency stop switch (10) is in its "O" (OFF) position
during normal operation. The switch must be moved and held in
the "I" (EMERGENCY STOP) position until the engine stops.
When released it will automatically move back to the "O" (OFF)
position.

FG001344

O

I

Figure 6 ENGINE EMERGENCY STOP
SWITCH

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Electrical System

9

1

+- -+

2

1-19

1-45

1-39

8

0.5G

10

3

R2

4

R1

BR

7

ACC

5

B

C

BR

E

A

2

B

3

BR

STARTER SWITCH CONNECTION

6

START

ON

TML

OFF

PST

B ACCR1 R2 C

FG001473

Figure 7 ENGINE STOP CIRCUIT

Reference

Number

Description

1 Battery

2 Battery Relay

3 Fusible Link

4 Circuit Breaker

5 Starter Switch

6 Fuse Box

7 Diode

8 Engine Controller

9 Injector Solenoid

10 Emergency Stop Switch

Reference

Number

Description

SP001038Electrical System

Page 20

CHARGING SYSTEM

When the starter switch (5) is turned to the "ON" position, an
initial excited current flows to the field coil of the alternator (7)
through the battery relay (2) and circuit breaker (4). When the
engine is started from this condition the alternator (7) starts
charging. The current flows from the "B(B+)" terminal of
alternator (7) o circuit breaker (4) o battery relay (2) obattery
(1).

The alternator also supplies electric current to other electrical
components. When the alternator (7) starts to operate, a current
flows from the "R(I)" terminal of alternator o diode (8) o battery
relay (2) coil securing a path for the charging current to the
battery (1). Thus preventing the possibility of a high voltage build
up and possible damage to the electric system.

TRIO DIODE

0.5 uF

8

START

ON

OFF

STARTER SWITCH CONNECTION

TML

PST

B BR R1 R2 C ACC

F+

F-

E

REG.

I(L)

FIELD

GRD

7

12V 100AH

R(I)

P(R)

B+

8

B(B+)

-

E

BR

4

B

12V 100AH

1

+ - +

2

A

6

R2

ACC

R1

B

BR

C

5

0.5G

3

FG007238

Figure 8 CHARGING CIRCUIT

Reference

Number

Description

1 Battery

2 Battery Relay

3 Fusible Link

4 Circuit Breaker

5 Starter Switch

6 Fuse Box

7 Alternator

8 Diode

Reference

Number

Description

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Page 21

Electrical System

MONITORING SYSTEM

The monitoring system displays the various data and warning
signals onto the instrument panel by processing the information
gathered from the e-EPOS controller. It displays information
selected by the operator.

E

B

+

-

R

C

H

E

F

H

C

POWER

1

5

2

3

6

7

AUTO

4

ESC

8

E/G SPEED

02/05 [MO] 11:30

1700

RPM

CHECK

1

2

8

3

4

5

7

9

10

11

12

13

6

FG000547

Figure 9

Reference

Number

Description

1 Instrument Panel

2 Battery

3 Light Switch

4 Return Filter Switch

5 Pilot Filter Switch

6 e-EPOS Controller

7 Alternator

8 Warning Buzzer

9

Pump Discharge Pressure

Sensor

10

Hydraulic Oil Temperature

Sensor

11 Fuel Sensor

12 Air Cleaner Indicator

13 Engine Controller

Reference

Number

Description

SP001038Electrical System

Page 22

Instrument Panel

C

H

E

F

H

C

POWER

1

5

2

3

6

7

AUTO

4

ESC

8

FG000548

E/G SPEED

02/05 [MO] 11:30

1700

RPM

CHECK

7 8 9 10 11 12

5

1

2

15

13

14

3

6

4

17

19

20

16 18

(CN7)

< CONNECTOR AND TERMINAL NO.>

12

6 5114

10 14

8 7

1516

2 1

8 739 12

5 4 3 2 1

1011 9

6

13

(CN6)

AMP 040 28P

1

Figure 10

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Page 23

Electrical System

When the engine starter switch is turned to the "I" (ON) position,
all gauge bands, switch/button indicator lights and indicator/
warning lights will turn "ON" and the alarm buzzer will sound
about two seconds.

During this functional check, a LOGO will appear on the multi
function gauge in the graphic information area

Gauges Warning Lights Mode Selector Switches

1. Fuel Gauge

2. Engine Coolant Temperature
Gauge

3. Hydraulic Oil Temperature
Gauge

4. Multifunction Gauge and
Letter Information Area

5. Digital Clock

6. Hour Meter

7. Charge Warning Light

8. Engine Oil Pressure Warning
Light

9. Coolant Temperature
Warning Light

10. Engine Check Warning Light

11. Preheat Indicator Light

12. Work Light Indicator Light

13. Power Mode Selector Switch
and Indicator

14. Work Mode Selector Switch
and Indicator

15. Auto Idle Switch and
Indicator

16. Flow Adjusting Switch

17. Up Button Switch

18. Down Button Switch

19. Display Selector Switch

20. Selector Button Switch

SP001038Electrical System

Page 24

Monitoring System Schematic

B

SIG

SIG

1-35

1-34

1-53

1-52

L5

L6

WARNING LAMP

L1 : CHARGE

L5 : PREHEAT

L2 : ENG OIL PRESS

L4 : E/G WARNING

L3 : W/T OVER HEAT

WATER TEMPERATURE

LCD DISPLAY PANEL

L6 : WORK LAMP

GRAPHIC DISPLAY

FUEL LEVEL

CN7-4

CN7-5

CN7-6

CN6-10

CN6-9

4

2

1

3

6

5

14

R(I)

CN4-1

CN2-14

CN3-8

CN3-7

CN3-10

CN3-9

CAN A

-

+

CN4-4

CN3-3

CN3-4

CN4-6

CN4-5

CN4-2

CN4-3

+

-

CN2-1

CN3-2

CN3-1

CN5-3

CN2-17

CN2-18

CN5-7

E

BR

A

L1

L3

L2

L4

ILL.

CN6-3

CN6-1

CN6-2

CN6-12

CN6-11

+

-

R2 B

13

21

6

5

20

14

18

7

8

11

10

12

9

15

1

4

2

3

19

17

16

CN5-2

1-56

TxD

RxD

GND

FG007141

Figure 11

SP001038

Page 25

Electrical System

Reference

Number

Description

1 Instrument Panel

2 Pilot Buzzer

3 Light Switch

4 Starter Switch

5 Front Pump Pressure Sensor

6 Rear Pump Pressure Sensor

7 Hydraulic Oil Temperature

Sensor

8 Fuel Sensor

9 Pedal Pressure Switch (Optional)

10 Air Cleaner Indicator

11 Pilot Filter Switch

12 Return Filter Switch

13 Alternator

14 e-EPOS Controller

15 Battery

16 Battery Relay

17 Circuit Breaker

18 Fusible Link

19 Fuse Box

20 Check Connector

21 Engine Controller

Reference

Number

Description

SP001038Electrical System

Page 26

OPERATION

Instruments

Function Display

Sensor Specification

Input Terminal Input Specification

Coolant
Temperature

ECU-CAN
Communication

Fuel Level

CN3-7

CN3-8

1/10 LCD (Red Zone)
Blinking o over 5K ohms

FULL o under 525 ohms

Hydraulic Oil
Temperature

CN3-9

CN3-10

40°C (104°F) o 1,397 ohms

50°C (122°F) o 1,139 ohms

60°C (140°F) o 881 ohms

94°C (201°F) o 190 ohms

96°C (205°F) o 177 ohms

(When reading increase)

Flow
Adjusting

(Output
Terminal)

CN1-19

CN1-20

48.5 l/min o610 mA

57 l/min o583 mA

66 l/min o555 mA

78.5 l/min o466 mA

(Default Set)

108 l/min o343 mA

114 l/min o290 mA

C

H

FG000550

Blue

White Red

107°C

102°C

41°C

61°C

E

F

FG000552

Blue

Red Full

1/10

C

H

FG000551

Blue

White Red

96°C

94°C

40°C

50°C

FG009964

78.5

96.5

106.5

108

(None)

48.5

57

66

69

90

114

114

SP001038

Page 27

Electrical System

Tachometer

ECU-CAN
Communication

N = 162 f / 60

N = Engine speed (rpm)

f = Frequency of engine
speed sensor (Hz)

Voltmeter CN2-14 0 - 32 VDC

Main pump
discharge
pressure
(front pump)

CN3-1

CN3-2

V = 0.00816 x P + 1.0

V: Sensor output voltage (V)

P: Displayed pressure (Bar)

Main pump
discharge
pressure
(rear pump)

CN3-3

CN3-4

Function Display

Sensor Specification

Input Terminal Input Specification

E/G SPEED

1700

RPM

FG000049

BATTERY

28.0

VOLT

FG000050

FRONT PUMP

320

BAR

FG000051

REAR PUMP

313

BAR

FG000052

SP001038Electrical System

Page 28

WARNING AND INDICATOR
LIGHTS

Indication of Warning Lights

Description Symbol

Input

Terminal

Operation Remarks

Charge CN2 - 14

It lights in case of no
charge [voltage of
"R(I)" terminal is
below 12 ±1V] or
overcharge [voltage
of "R(I)" terminal is
above 33(V)].

Normally, it lights
when starting engine
and is out after engine
starts.

Engine Oil
Pressure

ECU-CAN

Communic

ation

It lights when engine
oil pressure is below
the reference.

After starting engine,
if engine oil pressure
is insufficient after 8
seconds, a warning
buzzer will sound.

Engine
Check

ECU-CAN

Communic

ation

It lights in case of
failure in engine
system.

Coolant
Temperature

ECU-CAN

Communic

ation

It lights when engine
coolant temperature
sensor resistant is
below about 128
ohms.

Preheating CN5-2

It lights during
preheating ("CN5-2"
terminal voltage is
below 2V) and turns
"OFF" after
completion of
preheating.

Preheating period
depends on coolant
temperature.

No preheating at
above 10°C

10 sec preheating at
5°C

20 sec preheating at
below 0°C

HAOA610L

HAOA620L

CHECK

FG000045

HAOD350L

HAOA639L

SP001038

Page 29

Electrical System

Indication of Multifunction Gauge and

Letter Information Area

Work Light CN2 - 6

It lights when work
light turns "ON" (24V
applied).

Description Symbol

Input

Terminal

Operation Remarks

HB4O2003

Description Symbol

Input

Terminal

Operation Remarks

Hydraulic Oil
Temperature

CN3-9

CN3-10

When hydraulic oil
temperature is above
about 96°C.

Fuel
Exhausted

CN3-7

CN3-8

When fuel is almost
exhausted.

Air Cleaner CN2-17

When air cleaner is
clogged.

Return Filter CN5-3

When return filter
pressure is above
about 1.50 kg/cm²
(21 psi)

FG000056

FG000057

FG000053

FG000054

SP001038Electrical System

Page 30

Pilot Filter CN2-18

When pilot filter
pressure is above
about 1 kg/cm² (14
psi)

Overload
Warning

CN3-5

CN3-6

Warning buzzer also
starts when boom
pressure sensor
output voltage is
about 2.7V while
overload warning
switch is "ON."

It flickers in case of

2.71V and above and
lights continuously in
case of 2.8V and
above (and warning
buzzer also starts).

Boost CN2-2

It lights when boost is
selected.

Breaker CN2-10

It lights when breaker
is selected.

Shear CN2-9

It lights when shear is
selected.

FG000055

FG000253

FG000554

FG00147

0

FG001471

SP001038

Page 31

Electrical System

INITIAL OPERATION

NOTE: Refer to method for setting clock in operation manual

for setting time.

MODE SELECTOR SWITCH

Power Mode / Trenching Mode Switch

NOTE:

When the engine speed is below 1,000 rpm, the output
current of E.P.P.R valve is fixed to be 600 ±60mA.

Auto Idle Switch

Item Input (Terminal) Output (Operation and initial setting mode)

Initial
Operation

When "CN6-1,2" is applied
battery voltage (starter switch
shifts from "OFF" to "ON"

! LCD, all of LED and warning lights are turned

"ON" and turned "OFF" after about 2 seconds.

! Warning buzzer is activated and turned "OFF"

after about 2 seconds.

! Power mode: Standard mode.

! Work Mode: Digging mode.

! Auto Idle: High Output (Activation).

! Display: Indicating coolant temperature, Fuel

level, Hydraulic oil temperature, Engine speed.

! Clock: Current time display.

Operation Mode

Output Check

(Operation

mode display

LED)

e-EPOS Output

Electromagnetic
Proportional Pressure
Reducing Valve (E.P.P.R
Valve) Current (mA)

Swing Priority
Solenoid Valve

7-Segment
Display

Power

Mode

Power Mode ON

No-load: 150 ±20mA

Load: Variable output

(Max. current: 600 ±20mA)

- 9 x

Standard Mode OFF

No-load: 250 ±20mA

Load: Variable output

(Max. current: 600 ±60mA)

- 7 x

Work

Mode

Trenching Mode OFF - ON x 2

Digging Mode ON - OFF x 0

Operation Mode Output Check (Operation mode display LED)

Auto Idle

Activation ON

Cancellation OFF

SP001038Electrical System

Page 32

GRAPHIC INFORMATION AREA
DISPLAY

Overview

Many kinds of condition of machine are displayed on the letter
information display department. The information display
department is divided into two menus. One is main menu for
user and the other is special menu for specialist. These menus
can be moved from normal display mode by the combination of
selector buttons.

C

H

E

F

H

C

POWER

1

5

2

3

6

7

AUTO

4

ESC

8

FG000557

E/G SPEED

02/05 [MO] 11:30

1700

RPM

CHECK

5

1

4

3

2

Figure 12

Selector Buttons Graphic Display Area

1. Up Arrow Button

2. Down Arrow Button

3. Enter Button

4. Escape Button

5. Letter Information Display Department

SP001038

Page 33

Electrical System

Main Menus for the Graphic Display Area

1. Main menu: Language setting, Time setting, Filter/Oil
information, Brightness adjustment, Password

2. Special menu: Information of machine status, failure
information, Information of machine operation.

Menu Selector Buttons

1. Up Arrow Button ( , 1 on Figure 12): Move the cursor to
up, left and previous screen.

2. Down Arrow Button ( , 2 on Figure 12): Move the cursor
to down, right and next screen.

3. Enter Button ( , 3 on Figure 12): Move the menu to
selected mode. When setting the menu, this button is used
to function as the selector button.

4. Escape Button (ESC, 4 on Figure 12): Move a screen to
previous menu or main menu.

SP001038Electrical System

Page 34

MAIN MENU

When the "ESC" button is pressed for more than 3 seconds, the
main menu screen is displayed.

Main menu offers sub-menus (language setting, time setting, or
filter/oil information, brightness adjustment, password) to the
operator.

Refer to the "Operation and Maintenance Manual" for details.

Language

Put the cursor on Language in the main menu and put the Enter
Button ( , 3 on Figure 12) and the language select view
appears.

The default language is Korean, but it will memorize and use the
newly set language.

Use the Up Arrow Button ( , 1 on Figure 12) or Down Arrow
Button ( , 2 on Figure 12) to move cursor to a language to be

selected on the Language Select display and press the Enter
Button ( , 3 on Figure 12) and the selected language is
indicated in the right bottom of the screen.

At this point pressing the Enter Button ( , 3 on Figure 12) or
the Escape Button (ESC, 4 on Figure 12) more than 1 second
brings the main menu with changed language and then pressing
the ESC button again shows the default view.

Without pressing a button more than 20 seconds, the default
view appears.

MA I N ME N U

1. Language

4. Adjust Display

5. Set Password

2. Set Clock

3. Filter / Oil Info

: UP : D OWN : SELE CT

FG0000 72

Figure 13

MA I N ME N U

1. Language

4. Adjust Display

5. Set Password

2. Set Clock

3. Filter / Oil Info

: UP : D OWN : SELE CT

FG0000 72

Figure 14

1. Korean

2. English

: UP : D OWN : SELE CT

FG0007 83

Figure 15

LA N G UAG E

SP001038

Page 35

Electrical System

Set Clock

It is used to adjust time of the digital clock.

Pressing the Enter Button ( , 3 on Figure 12) in the Main
Menu after putting cursor on Set Clock brings Set Clock display.

Without pressing a button more than 20 seconds, the default
view appears.

Please refer to the Operation Manual for detailed information on
Time Setting.

Filter/Oil Info

This mode displays total operating hours of filters and oils.

After changing the filter and oil, reset the operating hour and
then the operating hours until the next service interval can be
easily checked.

MA I N ME N U

1. Language

4. Adjust Display

5. Set Password

2. Set Clock

3. Filter / Oil Info

: UP : D OWN : SELE CT

FG0000 75

Figure 16

SE T CLO C K

:

+

: : MOVE

FG0000 76

0 6 : 0 5
2004 0 6 / 29

Figure 17

MA I N ME N U

1. Language

4. Adjust Display

5. Set Password

2. Set Clock

3. Filter / Oil Info

: UP : D OWN : SELE CT

FG0000 77

Figure 18

FI LTE R / O I L I N FO

: UP : D OWN : RESE T

FG0000 78

1. Fuel F ilter
Hrs : 002 5

Figure 19

SP001038Electrical System

Page 36

Menu Display Order and Icon Explanation

Adjust Display

Pressing the Enter Button ( , 3 on Figure 12) in the main
menu after putting cursor on Adjust Display brings Adjust
Display.

Screen brightness can be adjusted using the Up Arrow Button
( , 1 on Figure 12) or the Down Arrow Button ( , 2 on Figure

12).

The default brightness is set to 50%.

1. Fuel Filter 2. Air Cleaner 3. Engine Oil Filter 4. Hyd. Oil Filter

5. Pilot Filter 6. Engine Oil 7. Hydraulic Oil 8. Coolant Water

FG001358

Figure 20

MA I N ME N U

1. Language

4. Adjust Display

5. Set Password

2. Set Clock

3. Filter / Oil Info

: UP : D OWN : SELE CT

FG0000 80

Figure 21

Ad j u st D i sp l a y

:

+

+

:

FG0000 81

50 %

LC D T ES T
LC D T ES T
LC D T ES T

Figure 22

Set Password

1. Language

4. Adjust Display

5. Set Password

2. Set Clock

3. Filter / Oil Info

: UP : D OWN : SELE CT

FG0002 27

Figure 23

This menu is used to apply (lock), release, or change password.

Please refer to the Operation Manual for detailed information on
Password Setting.

MA I N ME N U

Electrical System

SP001038

Page 37

SP001038Electrical System

Page 38

SPECIAL MENU

In this menu, many types of operating conditions and functions
can be accessed and displayed, including the e-EPOS
controller. This menu is mainly used for machine testing and
failure diagnostics.

The special menu offers three sub-menus:

1. Machine status.

2. Failure information.

3. Information on machine operation.

Entering/Accessing and Exiting/Escaping

Menus

Entering/Accessing Menus

When normal mode screen is displayed, if the enter button ( ,

3) and escape button (ESC, 4) are pressed simultaneously for

more than 3 seconds, normal mode screen (Figure 25) will be
changed to special menu screen (Figure 26).

Normal Mode Screen

NOTE: Normal mode screen can display many kinds of

display mode by selecting, for example, engine
speed (RPM), battery voltage (VOLT), front pump
pressure (BAR), rear pump pressure (BAR) and so
on by selecting.

1

5

POWER

3

2

6

7

AUTO

4

ESC

8

FG001402

3

4

2

1

Figure 24

C

H

C

E

F

H

02/05 [MO] 11:30

E/G SPEED

1700 RPM

FG000043

Figure 25

SP001038

Page 39

Electrical System

Special Menu Screen

NOTE: Displayed language on the special menu screen

consists of Korean and English.

If any language except for Korean is selected during
language selection mode of main menu, only English
will be displayed on special menu screen.

Exiting/Escaping Menus

1. If escape button (ESC, 4 on Figure 24) is pressed for more
than 1 second, the special menu screen will be returned to
the normal mode screen.

2. If this special menu is "ON" without any activity, for more
than 20 seconds, it will turn to the normal mode screen.

3. After the turning starter switch to the "OFF" position, turn it
back to the "ON" position, and the normal mode screen
displayed once again.

Special Menu Selections

Submenu Selection Method

Various sub-menus can be selected by pressing "Up ( , 1 on
Figure 24)" and "Down ( , 2 on Figure 24)" button.

Move the cursor to desired menu and a selected menu will be
inverse displayed.

When the selected menu is inverse displayed, press the "Enter
( , 3 on Figure 24)" button for menu selection.

Information of Machine Status

1. Entering Sub-menus: When cursor is located on "Machine
Info" of special menu screen, press "Enter ( , 3 on
Figure 24)" button and the "Machine Info" will be displayed.

2. Exiting Sub-menus: If escape button (ESC, 4 on Figure 24)
is pressed for more than 1 second, display will be turned to
previous screen.

SP E C IAL ME N U

1. Machine Info

2. Failure Info

3. Operating Hrs

: UP : D OWN : SELE CT

FG0005 58

Figure 26

SP E C IAL ME N U

1. Machine Info

2. Failure Info

3. Operating Hrs

: UP : D OWN : SELE CT

FG0005 58

Figure 27

MA C H INE I NF O

1. Analogue Input State

2. Digital Input State

3. Digital Output State

: UP : D OWN : SELE CT

FG0005 59

Figure 28

SP001038Electrical System

Page 40

Analog Inputs Description

Submenu Selections

Analog Input Items Display Remark

1. Pump P/V mA Current in pump proportional valve.

2. Cooling Fan P/V mA N.A.

3. Flow Control P/V mA N.A.

4. Dial mV Indicating dial voltage.

5. TPS mV N.A.

6. E/G Control Motor mV N.A.

7. Boom Pressure BAR Boom cylinder head pressure.

8. Pilot Gear Pump Press BAR N.A.

9. Boost Pressure BAR Pump pressure for boost.

10. Intake Manifold Temperature °C Temperature of air incoming to
intake manifold.

11. E/G Oil Pressure BAR Engine oil pressure.

12. Fuel Temperature °C Fuel temperature.

13. E/G Oil Temperature °C Engine oil temperature.

14. Load At Cur. Spd % Current load ratio of equipment.

FG008126

AN A L OG I N PUT S T ATE

: UP : DOWN Page:3/3

1. Pump P/V

2. Cooling Fan P/V

3. Flow Control P/V

4. Dial

5. TPS

6. E/G Control Motor : N.A

7. Boom Pressure

8. Pilot Gear Pump Press.

9. Boost Pressure

11. E/G Oil Pressure

14. Load at Cur. Spd : 000 %

AN A L OG I N PUT S T ATE

AN A L OG I N PUT S T ATE

10. Intake Manifold Temp.

12. Fuel Temp.

13. E/G Oil Temp.

: 000mA

: 000mA

: N.A

: N.A

: 000mV
: 000mA

: 000 C

: 000 C

: 000 C
: 000BAR

: 000BAR

: 000BAR

Figure 29

: UP : DOWN Page:1/3 : UP : DO WN Pag e:2/3

SP001038

Page 41

Electrical System

Digital Inputs Descriptions

Digital Inputs Items Mark Remark

1. Alternator

ON / OFF

Lights up when output at alternator
"R(I)" terminal is above 12 ±1V.

2. Travel Select SW N.A. (only for wheel type equipment)

3. High Speed Sel. SW (M)

Lights up when the travel speed
selector switch is set to the "I"
position.

4. High Speed Sel. SW (A)

Lights up when the travel speed
selector switch is set to the "II"
position.

5. Pressure SW (Py)

Lights up when the pressure switch
(Py) is "ON."

6. Pressure SW (Px)

Lights up when the pressure switch
(Px) is "ON."

7. E/G Oil Press. SW N.A. (only for mechanical engine)

8. Air Cleaner Clogged

Lights up when the air cleaner
indicator contact is "ON."

9. Return Filter Clogged

Lights up when the return filter
pressure switch is "ON."

10. Pilot Filter Clogged

Lights up when the pilot filter
pressure switch is "ON."

11. OWD Warning SW

Lights up when the overload
warning selector switch is "ON."

12. Brake Oil Press. SW N.A. (only for wheel type equipment)

13. Pedal Press. SW

Lights up when the pedal pressure
switch is ON.

14. One Way Sel. SW

Lights up when the selector switch is
turned to breaker.

15. Two-way Sel. SW

Lights up when the Selector Switch
is turned to "SHEAR."

16. Power Max. SW

Lights up when the boost button is
"ON" with the Select switch turned
to "BOOST."

17. Breaker SW

Lights up when the boost button is
"ON" with the selector switch turned
to "BREAKER."

18. Preheat Select N.A.

19. Quick Coupler

Lights up when the Quick Coupler
switch is "ON."

20. F and R Lever N.A. (only for wheel type equipment)

21. Preheat Select

Lights up during preheating (CN5-2)
terminal voltage is below 2V.

22. Reverse Fan SW N.A.

23. Pilot Cutoff SW N.A.

Menu Select

: UP : DOW N Page:1/ 4

: UP : DOW N Page:3/ 4

1. Alte rna tor

2. Travel Select SW

3. High Sp eed Sel. SW (M)

4. High Sp eed Sel. SW (A)

5. Pres sur e SW (Py)

6. Pres sur e SW (Px)

:
:
:
:
:
:

19. Qui ck Coupler

20. F&R Le ver

21. Pre hea t Select

22. Rev ers e Fan SW

23. Pil ot Cutoff S W

:
:
:
:
: N.A

7. E/G Oil Pr ess. SW

8. Air Cle aner Clogged

9. Retu rn Filter Clogged

10. Pil ot Filter Clogged

11. OWD Warning SW

12. Bra ke Oil Press. SW

: N.A
:
:
:
:
: N.A

13. Ped al Press. SW

14. One Way Sel. SW

15. Two Way Sel. SW

16. Pow er Max. SW

17. Bre ake r SW

18. Pre hea t Select

:
:
:
:
:
: N.A

DI G I TA L INP U T STAT E

DI G I TA L INP U T STAT E DI G I TA L INP U T STAT E

Figure 30

DI G I TA L INP U T STAT E

: UP : DOW N Page:2/ 4

: UP : DOW N Page:4/ 4

FG008136

Page 42

SP001038Electrical System

SP001038

Page 43

Electrical System

Digital Outputs Descriptions

Menu Select

Failure Information

1. Entering Sub-menus: When a cursor is located in "Failure
Info" of special menu screen press enter button ( , 3 on
Figure 24) and "Failure Info" screen is displayed.

2. Exiting Sub-menus: If escape button (ESC, 4 on Figure 24)
is pressed for more than 1 second, this information screen
will be returned to previous screen.

* Real-time Failure:

Current status of failure is displayed.

* Failure Log:

Memorized record of past failure is displayed.

* Delete Fail Log:

This mode is used to delete all of the
memorized record of past failure.

Digital Outputs Items Mark Remark

1. Relief Press. Up S/V

ON / OFF

Lights up when the relief press up
solenoid valve is "ON."

2. High Speed S/V

Lights up when the high speed
solenoid valve is "ON."

3. Swing Priority S/V

Lights up when the swing priority
solenoid valve is "ON."

4. Reverse Fan S/V N.A.

5. Starter Relay When the starter relay is "ON."

6. After Heat Relay N.A.

: UP : DOWN Page:1 /1

FG0039 30

1. R elief Press. Up S/V

2. H igh Speed S/V

3. S wing Priority S/V

4. R everse Fan S/V

5. S tarter Relay

6. Afterheat Relay

:
:
:
: N. A
:
: N. A

DI G I TA L O U TPU T STATE

Figure 31

SP E C IAL ME N U

1. Machine Info

2. Failure Info

3. Operating Hrs

: UP : D OWN : SELE CT

FG0005 63

Figure 32

FA I L URE I NF O

1. Realtime Fail

2. Failure Log

3. Delete Fail Log

: UP : D OWN : SELE CT

FG0005 64

Figure 33

SP001038Electrical System

Page 44

A. Current failure information

Current status of failure is displayed (Failure code,
failure contents).

When a number of failures are produced, failure
information can be checked using "UP" ( , 1 on
Figure 24) or "DOWN" ( , 2 on Figure 24) button.

* 1/2: A serial number of current failure/ total quantity

of failure.

* Vxxx-xx: Vxxx is a unique code and xx is a FMI

(Failure Mode Identifier) number.

- V: Machine related failure code

- E: Engine related failure code

Refer to the failure information code for unique codes
and FMI numbers.

This example shows one of two failures.

B. Past failure information

Memorized record of past failure is displayed (Failure
code, failure contents).

When a number of failures are produced, failure
information can be checked using "UP" ( , 1 on
Figure 24) or "DOWN" ( , 2 on Figure 24) button.

NOTE: " Number: xxx ": "xxx" means that the

totally counted number of the same failure.

" Period:xxxxxHrxxm ": It indicates the
period for which machine has operated
until a failure takes place. (For more than
two occurrences of the same failure, until
the first occurrence time.)

C. Failure record deletion

This mode is used to delete the memorized record of
past failure. If this mode is selected, all records will
be deleted.

When "YES" ( , 3 on Figure 24) button is pressed,
the memorized record will be deleted.
At this time, deletion signal will be displayed and the
screen will move to previous menu after deletion.

This screen will be displayed during 3 seconds.

RE A LT I M E FA I L

: UP : DOWN

FG0005 65

1/ 2 CO DE : V2 04 -0 5
2/ 2 CO DE : E0 11 - 04

Re li ef Pr es su r e Up S / V
Cu rr en t b el ow no rm al (C UR RE N T

BE LO W N OR MA L or o p en c ir c ui t)

Figure 34

: UP : DOWN

FG0005 66

1/ 2 CO DE : V2 04 -0 5
2/ 2 CO DE : E0 11 - 04
Pe ri od : 00 25 4H r 2 9m N um be r: 0 8
Re li ef Pr es su r e Up S / V
Cu rr en t b el ow no rm al (C UR RE N T
BE LO W N OR MA L or o p en c ir c ui t)

Figure 35

DELETE FAIL LOG

ESC: No

FG0005 67

: Yes

Al l Fai l Lo g wil l be
DE L E TED .

Figure 36

FA I L URE L OG

SP001038

Page 45

Electrical System

Input your password with one of No. 1 - 8 switches.

When "NO" (ESC, 4 on Figure 24) button is pressed,
the screen will recover to previous menu without
deletion.

Delete Completed screen will appear 3 seconds and
the screen will move to Failure Info screen.

It has been shown 3 seconds upon deleting Fail Log.

The screen shown on the left will appear 3 seconds in
case of wrong password input and then Enter
Password screen appears again.

It has been shown 3 seconds in case of password
failure.

ESC: No

FG0005 69

: Yes

DE L ET E D!! !

DELETE FAIL LOG

Figure 38

ESC: No

FG0005 70

: Yes

PASSWORD ERR !!!

DELETE FAIL LOG

Figure 39

DELETE FAIL LOG

Figure 37

ENTER PASSWD

: Yes

ESC: No

FG0005 68

SP001038Electrical System

Page 46

Failure Information Code at Machine Side

Code Failure Component

Measuring

Points

Correct Value

Remarks

Active Passive

V201

Gauge Panel
Communication Error

CN7-4

CN7-5

- R 60 ±5 :

It is a
composite
resistance of
CAN line. This
value has to be
measured by
connected
condition of
CAN line.

V202

Ecu Communication Error

CN4-4

CN4-5

- R 60 ±5 :

V210

Pump P/V

CN1-10

CN1-21

-

R 18 ±2 :

(25°C (77°F))

Pump
proportional
pressure
reducing valve.

V211

Cooling Fan P/V - -

N.A.

V212

Flow Control P/V

CN1-19

CN1-20

-

R 14 ±2 :

(25°C (77°F))

Flow control
proportional
pressure
reducing valve.

V213

Relief Pressure Up S/V

CN1-1

CN1-11

V = V_volt (Note

4.)

R 26.2 ±2 :

(25°C (77°F))

Breaker/boost/
shear selector
switch has to
be selected as
a boost
function and
the boost
switch on the
right-hand
joystick is "ON"
status.

V214

High Speed S/V

CN1-1

CN1-12

V = V_volt

R 26.2 ±2 :

(25°C (77°F))

Voltage is only
measured
when the
pressure
switch (Py) is
turned "ON."

V215

Swing Priority S/V

CN1-1

CN1-13

V = V_volt

R 26.2 ±2 :

(25°C (77°F))

Work mode
has to be
selected as a
trenching
mode.

V216

Reverse Fan Speed S/V - -

N.A.

V217

Starter Relay

CN1-1

CN1-15

V = V_volt -

It has to be
measured in
engine start up
state.

V218

After Heat Relay - -

N.A.

SP001038

Page 47

Electrical System

NOTE: 1. Active value: Starter switch has to be turned "ON"

Measuring points between component and wire
harness have to be connected.

2. Passive value: Starter switch has to be turned
"OFF"

Measuring points between component and wire
harness have to be disconnected.

3. Measuring points are engine controller's points and
passive value is each component's value.

4. V#batt: Source power of equipment.

V220

Front Pump Press. Sensor

CN3-1

CN3-2

V = IV -

It has to be
measured in
engine stop
state.

V221

Rear Pump Press. Sensor

CN3-3

CN3-4

V = IV -

V222

Hyd. Oil Temperature Sensor

CN3-9

CN3-10

-

R 2.45 r25

k: (25°C

(77°F))

R 320 ±32 :
(80°C (176°F))

V223

Water Temperature Sensor - -

N.A.

V224

Engine Speed Sensor - -

N.A.

V225

Fuel Level Sensor

CN3-7

CN3-8

-

Empty: 5 r25

k:

Full: 320 ±32

:

V226

Alternator Potential

CN2-14

CN1-8

V = 2 ±1V -

It has to be
measured in
engine stop
state.

V227

Dial

CN3-16

CN3-7

-

R 1.0 r3

k:

R 4.0 ±1.5

k:

V228

Tps (Wheel) - -

N.A.

V229

Parking Brake Press. Sensor - -

N.A.

V230

E/g Control Motor Sensor - -

N.A.

Code Failure Component

Measuring

Points

Correct Value

Remarks

Active Passive

SP001038Electrical System

Page 48

Failure Information Code at Engine Side

Code Failure Component

Measuring

Points

Current Valve

Remarks

Active Passive

E011

Coolant temperature sensor

2-26

2-15

-

R 186 ±5 :

(100°C

(212°F))

E012

Fuel temperature sensor

2-26

2-35

-

R 186 ±5 :

(100°C

(212°F))

E013

Boost air temperature sensor

2-36

2-25

-

R 186 ±5 :

(100°C

(212°F))

E014

Boost air pressure sensor

2-33

2-34

V 1,071 ±58mV

(at 23°C (73°F)

and absolute

pressure 1bar)

-

It has to be
measured in
engine running
state.

E017

E/G oil temperature sensor

2-28

2-24

-

R 186 ±5 :

(100°C

(212°F))

E018

E/G oil pressure sensor

2-32

2-27

V 2,318 ±80mV

(at 23°C (73°F)

and absolute

pressure 3bar)

-

It has to be
measured in
engine running
state.

E021

Battery voltage

1-03

1-06

V = V#volt

(Note 4.)

-

E022

Fuel pressure sensor

3-09

3-10

V 1,833 ±28mV

(at 23°C (73°F)

and absolute

pressure 300bar)

-

It has to be
measured in
engine running
state.

E032

Fuel pressure monitoring
MPROP

2-14

2-12

-

R 2.60 ±3.15

:

(20°C (68°F))

E037

CAN module

1-53 and

1-52

1-35 and

1-34

-

R 60 ±5 :

(20°C (68°F))

It is a composite
resistance of
CAN line.

This value has
to be measured
by connected
condition of
CAN line.

E038

Engine overspeed - -

E039

Main relay (ECU) - -

E041

Redundant shutoff path - -

Abnormal
engine stop.

E042

E/G speed (Crankshaft)

2-23

2-19

-

R 860 ±6 :

(20°C (68°F))

E043

E/G speed (Camshaft)

2-09

2-10

- -

SP001038

Page 49

Electrical System

E044

Engine speed sensor - -

Synchronizing
error between
crank shaft
speed sensor
and cam shaft
speed sensor.

E045

EEPROM - -

Data storing
error when
engine stop.

E046

Recovery - -

E047

Monitoring of PRV - -

When the
pressure sensor
of common rail
or
high-pressure
pump has a
defect.

E048

Power supply

1-03

1-06

V = V#volt -

E049

Booster voltage C1 - -

E051

Booster voltage C2 ($6, 2
and 4)

- -

E058

Solenoid power stage 1

3-13

3-04

-

R 0.31 ±0.42

:

(20°C (68°F))

E059

Solenoid power stage 2

3-11

3-06

- -

E061

Solenoid power stage 3

3-05

3-12

- -

E062

Solenoid power stage 4

3-03

3-14

- -

E063

Solenoid power stage 5

3-01

3-16

- -

E064

Solenoid power stage 6

3-02

3-15

- -

E066

Preheat light (E/G: Lowside
Power stage 2)

1-56

1-06

- -

E072

Preheat relay (E/G: Highside
Power stage 1)

1-13

1-07

V = V#volt

R 40 ±5 :

(25°C (77°F))

Voltage is only
measured when
afterheat
function is
operating
status.

Code Failure Component

Measuring

Points

Current Valve

Remarks

Active Passive

SP001038Electrical System

Page 50

NOTE: 1. Active value: Starter switch has to be turned "ON"

Measuring points between component and wire
harness have to be connected.

2. Passive value: Starter switch has to be turned
"OFF"

Measuring points between component and wire
harness have to be disconnected.

3. Measuring points are engine controller's points and
passive value is each component's value.

4. V#batt: Source power of equipment.

E083

Fuel HI pressure pump
(E/G: Current controlled
Highside power stage 1)

- - -

Fuel metering
unit error of
high-pressure
pump.

E091

System start-up test for
shutoff path

- - -

Power supply
error

Engine
controller error.

E092

Monitoring of misfire cylinder
1

- - -

Injector error

Speed signal
error of cam
shaft speed
sensor or crank
shaft speed
sensor.

E093

Monitoring of misfire cylinder
2

- - -

E094

Monitoring of misfire cylinder
3

- - -

E095

Monitoring of misfire cylinder
4

- - -

E096

Monitoring of misfire cylinder
5

- - -

E097

Monitoring of misfire cylinder
6

- - -

E098

Monitoring of misfire multiple
cylinder

- - -

E099

Monitoring of overrun - - -

E101

Engine speed redundant - - -

Code Failure Component

Measuring

Points

Current Valve

Remarks

Active Passive

SP001038

Page 51

Electrical System

FMIs (Failure Mode Identifier)

Information of Machine Operation

Accumulated operation hour of each mode and status is
displayed.

1. Operating Hour Information

A. Entering Sub-menus: When a cursor is located in

"Operating Hrs" of special menu screen (Figure 40)
press enter button ( , 3 on Figure 24) and
"Operating Hrs" screen will be displayed (Figure 41).

B. Information screen of machine operation (Figure 41).

FMI 0

Above normal range (DATA VALID but ABOVE NORMAL OPERATIONAL RANGE)

FMI 1

Below normal range (DATA VALID but BELOW NORMAL OPERATIONAL RANGE)

FMI 2

Incorrect signal (DATA ERRATIC, INTERMITTENT OR INCORRECT)

FMI 3

Voltage above normal (VOLTAGE ABOVE NORMAL OR SHORTED TO HIGH SOURCE)

FMI 4

Voltage below normal (VOLTAGE BELOW NORMAL OR SHORTED TO LOW SOURCE)

FMI 5

Current below normal (CURRENT BELOW NORMAL OR OPEN CIRCUIT)

FMI 6

Current above normal (CURRENT ABOVE NORMAL OR GROUNDED CIRCUIT)

FMI 8

Abnormal signal (ABNORMAL FREQUENCY OR PULSE WIDTH OR PERIOD)

FMI 11

Failure mode not identifiable (ROOT CAUSE NOT KNOWN - Malfunction)

FMI 31

NOT AVAILABLE OR CONDITION EXISTS

SP E C IAL MEN U

1. Machine Info

2. Failure Info

3. Operating Hrs

: UP : DOW N : SELECT

FG0005 71

Figure 40

OP E R AT I N G H O U RS

Reset Hours

Operating Hours

: UP : D OWN : SELECT

FG0005 72

Figure 41

C. Operating Hours Screen

: UP : DO WN : SELECT

FG0005 73

1. Powe r

2. Tr enching

3. Au to idle

4. Travel speed
I speed

I I speed

: 00042 Hr
: 00003 Hr
: 00005 Hr

: 00007 Hr
: 00001 Hr

OP E R AT I N G H O U RS

Figure 42

Item Information Contents Detection Method

Power Mode Operation hours used power mode

are displayed.

Power mode switch (Instrument panel) ­"ON" status and Alternator signal
(CN2-14) is "HI"

Trenching Mode Operation hours used trenching

mode are displayed.

Trenching mode switch (Instrument
panel) - "ON" status and Alternator
signal (CN2-14) is "HI"

Auto Idle Operation hours used auto idle

status are displayed.

Auto idle switch (Instrument panel) ­"ON" status and Alternator signal
(CN2-14) is "HI"

Travel Speed:

-1st

- 2nd

Operation hours used low speed
and high speed are displayed.

1st: High speed s/v "OFF" status

2nd: High speed s/v and travel pressure
switch "Py" (control valve) - "ON" status.

Hydraulic Oil Temperature
Distribution (°C (°F))

Temperature of hydraulic oil is
classified 6 steps. And operation
hours of each step are displayed

Under 30°C (87°F)
31 - 50°C (88 - 123°F)
51 - 75°C (124 - 168°F)
76 - 85°C (169 - 186°F)
86 - 95°C (187 - 203°F)
Over 96°C (204°F)

The resistance delivered from
temperature sensor of hydraulic oil is
classified 6 steps. And operation hours
of each step are displayed. (Alternator
output HI status)

Coolant Temperature
Distribution (°C (°F))

Temperature of coolant is classified
6 steps. And operation hours of
each step are displayed.

Under 40°C (105°F)
41 - 60°C (106 - 141°F)
61 - 85°C (142 - 186°F)
86 - 95°C (187 - 204°F)
96 - 105°C (205 - 222°F)
Over 106°C (223°F)

The resistance delivered from coolant
sensor is classified 6 steps. And
operation hours of each step are
displayed. (Alternator output HI status)

D. Exiting Sub-menus: If escape button (ESC, 4 on

Figure 24) is pressed for more than 1 second, this
information screen will be returned to previous
screen.

Information contents of operation hour

Page 52

SP001038Electrical System

SP001038

Page 53

Electrical System

Menu Selection of Operation Hour Information

Example of Machine Operation Info Screen

2. Operation hour reset

A. Entering Sub-menus: When cursor is located in

"Reset Hrs" of information screen of operating hours
press enter button ( , 3 on Figure 24) and
"Machine Operation Info" screen will be displayed.

1. Power Mode

2. Trenching Mode

3. Auto Idle

4. Travel Speed 1st, 2nd

5. Hydraulic Oil Temperature Distribution

6. Coolant Temperature Distribution

FG000574

Figure 43

FG0005 75

OP E R AT I N G H O U RS

: UP : DOWN P age:1/3 : UP : DO WN Page:2/3

: UP : DOWN Page:3/3

1. Powe r

2. Tr enching

3. Au to idle

4. Tr avel speed
I Sp eed

I I S pee d

: 00042 Hr
: 00003 Hr
: 00005 Hr

: 00007 Hr
: 00001 Hr

5. Hyd. Oi l Temp. [ C]
30
31 - 50
51 - 75

86 - 95
96

: 00003 Hr
: 00005 Hr
: 00008 Hr

76 - 85 : 00000 Hr

: 00007 Hr
: 00001 Hr

6. Cool ant Temp. [ C]
40
41 - 60
61 - 85
86 - 95
96 - 105
1 06

: 00003 Hr
: 00005 Hr
: 00000 Hr
: 00000 Hr
: 00007 Hr
: 00001 Hr

OP E R AT I N G H O U RS

OP E R AT I N G H O U RS

Figure 44

Reset Hrs

Operating Hrs

: UP : DO WN : Yes

FG0005 78

OP E R AT I NG H O URS

Figure 45

SP001038Electrical System

Page 54

B. Reset screen of operation hour

C. Exiting Sub-menus: If escape button (ESC, 4 on

Figure 24) is pressed for more than 1 second, this
information screen will be returned to previous
screen.

NOTE: When "YES" ( , 3 on Figure 24) button is

pressed, operation hours will reset.
At this time, resetting signal will be displayed
and the screen will move to previous menu after
resetting.

NOTE: When "NO" (ESC, 4) button is pressed, the

screen will recover to previous menu without
resetting.

Machine Operation Info Screen

1. If you press the YES" ( , 3 on Figure 24) button,
password entrance screen appears.

2. When right password is input, machine operation periods
will be deleted and Reset Completed screen will appear 3
seconds.

3. If you press the "NO" (ESC, 4) button, the previous screen
appears without resetting operation periods.

ESC: No

FG0005 76

: Yes

OP E R AT I NG H O URS

ENTER PASSWD

Figure 47

ESC: No

FG0005 77

: Yes

DE L E TED ! ! !

OP E R AT I NG H O URS

Figure 48

ESC: No

FG0010 86

: Yes

PASSWORD ERR !!!

OP E R AT I NG H O URS

Figure 49

OP E R AT I NG H O URS

Figure 46

Al l Ope r ati n g
Ho u r s w i ll b e
DE L E TED .

: Yes

ESC: No

FG0005 79

Electrical System

SP001038

Page 55

SP001038Electrical System

Page 56

ELECTRONIC HYDRAULIC
CONTROL SYSTEM (e-EPOS)

Control System Schematic

Work Mode
Auto Idle
Machine Info

E/G

E/G speed order

FG000795

POWER UP

C

H

E

F

H

C

POWER

152

3

6

7

AUTO

4

ESC

8

E/G SPEED

02/05 [MO] 11:30

1700

RPM

CHECK

5

44

3

8

8

7 7

16

6 6

11 12 14

13

15

109

2

17 21 19 18 22 20

23

1

Figure 50

SP001038

Page 57

Electrical System

Reference

Number

Description

1 Instrument Panel

2 e-EPOS Controller

3 Engine Controller (ECU)

4 Main Pump

5 Aux Pump

6 Control Valve

7 Pressure Switch

8 Pump Pressure Sensor

9

Electromagnetic Proportional

Pressure Reducing Valve

(Attachment)

10

Electromagnetic Proportional

Pressure Reducing Valve (Mode

Control)

11 Solenoid Valve (Boost)

12 Solenoid Valve (Swing Priority)

13 Solenoid Valve (High Speed)

14 Solenoid Valve (Breaker)

15 Travel Motor

16 Main Relief Valve

17 Engine Control Dial

18

Breaker/Boost/Shear Selector

Switch

19 Auto Travel Selector Switch

20

Boost Switch

(Right Work Lever)

21 Sensor

22 Aux Mode Switch

23 Aux Mode Resistor

Reference

Number

Description

SP001038Electrical System

Page 58

POWER MODE CONTROL

POWER

1

5

2

3

6

7

AUTO

4

ESC

8

E/G

FG000796

1

10

5

4

66

3

17

23 22

4

2

Figure 51

Reference

Number

Description

1

Instrument Panel (Power Mode

Selector Switch)

2 e-EPOS Controller

3 Engine Controller (ECU)

4 Main Pump

5 Aux Pump

6 Control Valve

10 Electromagnetic Proportional

Pressure Reducing Valve (Mode

Control)

17 Engine Control Dial

22 Aux Mode Switch

23 Aux Mode Resistor

Reference

Number

Description

SP001038

Page 59

Electrical System

The power mode switch permits the selection of the appropriate
engine power depending on the working condition. One of the
two, Power Mode or Standard Mode, setting can be selected.
When the engine starter switch is turned "ON," the power mode
is automatically defaulted to standard mode. The desired mode
can be selected by pressing the selector button on the
instrument panel. When the power mode is selected, the
indicator light will turn "ON" to display the selected mode.

The quantity of oil discharged by the pump and the engine
speed are determined by the mode selected by the operator.
The pump output in each mode is determined by the mode
selection and is listed in the following table

Mode Standard Mode Power Mode

Output (%) Approximately 85% 100%

SP001038Electrical System

Page 60

Operation

1. Power Mode

This mode should be selected for high speed work. In this
mode the engine output is most efficiently utilized due to
the discharged oil volume being controlled based on the
equivalent horsepower curve at various loaded pressures.
The e-EPOS controller compares the target engine speed
with the actual engine speed and controls the signal to the
E.P.P.R. (Electromagnetic Proportional Pressure
Reducing) valve which in turn varies the pump output
quantity.

If the load increases, the engine speed will fall below the
rated speed. When this occurs, the controller senses this
decrease and immediately reduces the pump discharge
volume to maintain the engine speed at the rated level.

On the other hand, if the load is decreased the controller
increases the discharge volume of the pump to maintain
the engine speed at the rated level.

By repeating these control operations, the engine speed is
maintained at the rated speed so that maximum power can
be generated.

In Power Mode, the e-EPOS controller receives engine
speed signals from the engine control dial and the engine
controller (ECU) and converts it to an operating signal
current and is then transferred to the pump's E.P.P.R
valve. At this time the E.P.P.R. valve converts the electric
signal to the corresponding control pressure and sends it
to the two pumps, adjusting the pump discharge volume to
the desired level.

ARO0260L

Figure 52

B D

CA

FG0 00 58 0

Figure 53

Reference

Number

Description

A Engine Horsepower (hp)

B Engine Speed (rpm)

C Pump Discharge Volume (lpm)

D Pump Discharge Pressure

(kg/cm2)

Reference

Number

Description

SP001038

Page 61

Electrical System

2. Standard Mode

Standard Mode is used for general work. When this mode
is selected it will reduce noise and fuel consumption in
comparison with Power Mode. The current to the E.P.P.R.
valve is shut off and pump discharge volume is controlled
by pump regulator.

3) Operation in case of failure in the control system (Aux
mode operation

Though it is impossible to control current of the E.P.P.R
(Electromagnetic Proportional Pressure Reducing) Valve
controlling the discharge volume of pump due to fault in control
system, the machine can be operated in the aux mode.

Upon turning "ON" the aux mode switch, the E.P.P.R Valve
controlling the discharge volume of pump comes into contact
with the aux mode resistor to let current of a certain value flow.
At this time, the discharge volume of pump follow the control by
the pump regulator, nearly at quantity roughly similar to that in
the standard mode.

B D

CA

FG0005 81

Figure 54

Reference

Number

Description

A Engine Horsepower (hp)

B Engine Speed (rpm)

C Pump Discharge Volume (lpm)

D Pump Discharge Pressure

(kg/cm2)

Reference

Number

Description

SP001038Electrical System

Page 62

POWER MODE CONTROL ­CIRCUIT DIAGRAM

5336

72

ECU CON.1 (89-PIN)

54

11

7

61

71

89

(CN7) (CN6)

12

2

VEHICLE

18

1712

VEHICLE CONN.

910111416 15 13 12

(CN5)

(ECU CONNECTOR)

35

(CN3)(CN4)

11

5

AMP 040 12P

6

12

1238 7 5 46

AMP 070 16P

16 15 14 13

456 3

19 182089 7

91023 1 8

17

AMP 040 20P

7

10

4

1-40

1-09

1-08

1-03

1-02

1-51

1-11

1-10

1-05

1-06

(CONN.1)

CONN

1-52

1-53

1-34

1-33

1-35

CN7-6

CN6-10

CN6-9

CN7-4

CN7-5

CN6-1

CN6-2

6

14

AMP 040 28P

18

7

15

67

3

9101112 16

8

6 5 4

78

1

2

(CN2)

AMP 070 18P

11

1

1416 15

6 5

18 17

78

19

810

910

2 1

21 20

9

13 12411

3

913 12 11 10

5 1234

(CN1)

14 1113 12

34 2 1

1617 15

6 5

AMP MIC 21P

GND

CN3-17

BBR

15A

10A

+(5V)

SIG

CN3-16

CN3-15

4

3

HIGH

CW

LOW

2

1

CAN

2

1

CN1-10

3

CN1-21

CN4-6

CN1-8

CN1-9

P/V-(A)

5

15A

CN4-5

CN4-4

CN1-1

CN1-2

15A

10A

1

3

4

26

26 26

25

24

11

23

22

10

17

26

26

28

FG008165

Figure 55

Reference

Number

1 Instrument Panel

3 Engine Controller

4 e-EPOS Controller

10 E.P.P.R. Valve (Electromagnetic

Proportional Pressure Reducing)

17 Engine Control Dial

22 Aux Mode Switch

Description

Reference

Number

23 Aux Mode Resistor

24 Battery

25 Battery Relay

26 Fuse

27 Fusible Link

28 Starter Switch

Description

Electrical System

SP001038

Page 63

SP001038Electrical System

Page 64

WORK MODE CONTROL

Depending on the working condition, one of two work modes,
"DIGGING" or "TRENCHING" can be selected from the
instrument panel.

When the engine starter switch is turned "ON," the work mode is
automatically defaulted to digging mode.

Depending on the trenching mode selected, the control valve
solenoid adjusts the assignment of hydraulic oil flow to each
device on the equipment.

POWER

1

5

2

3

6

7

AUTO

4

ESC

8

2

17

1

5

44

6

6

12

3

FG000797

E/G

Figure 56

Reference

Number

Description

1

Instrument Panel (Trenching

Mode Selector Switch)

2 e-EPOS Controller

3 Engine Controller

4 Main Pump

5 Aux Pump

6 Control Valve

12 Solenoid Valve

17 Engine Control Dial

Reference

Number

Description

SP001038

Page 65

Electrical System

Operation

1. Digging Mode

This mode is used for general digging work, loading work
and ground leveling work requiring quick stops. The
current to the solenoid valve for swing priority is shut off.

2. Trenching Mode

This mode is used for heavy duty ditch digging work or for
loading work requiring big swing angles. The voltage is
assigned to the swing priority control valve activating the
swing control valve restricting the flow of oil to the boom
and the arm.

ARO0270L

Figure 57

SP001038Electrical System

Page 66

WORK MODE CONTROL ­CIRCUIT DIAGRAM

B@M

'BM4(

@LO/6/05O

4

02

765

030504

0/

1/

43

120

3012

5

'BM3(

0180/00

010/00786

876034521

'BM2(

08 07 0605 0403 02 0100

@LO/3/01O@LO/3/1/O

BM6,5

BM3,5

BM6,3

BM6,4

BM5,8

BM5,0/

BM3,3

BM3,4

BM5,0

BM5,1

0/0001

'BM5(

040380201 00 0/

'BM6(

86705

3

80/000502030401

54

'BM1(

0706

030708050604101/

'BM0(

56740123201

@LO/3/17O

012543

@LO/6/07O

67

36754

@LOLHB10O

0/8

020001

210

'B4(

BM0,02

BM0,8

BM0,7

BM0,1

BM0,0

04@

04@

1

26

4 26

25

24

12

FG000583

Figure 58

Reference

Number

Description

1 Instrument Panel

2 e-EPOS Controller

12 Solenoid Valve (Swing Priority)

24 Battery

25 Battery Relay

26 Fuse

Reference

Number

Description

SP001038

Page 67

Electrical System

ENGINE CONTROL SYSTEM

When the engine control dial is moved the output voltage
changes according to the dial position.

The e-EPOS controller converts this output voltage of dial to
digital signal and sends it to the engine controller by CAN line.
According to the dial command, the quantity of fuel injection is
adjusted.

FG000584

(Drive Signal) (Command Signal)

Figure 59

Reference

Number

Description

3 Engine Controller

4 e-EPOS Controller

17 Engine Control Dial

Reference

Number

Description

SP001038Electrical System

Page 68

ENGINE CONTROL DIAL

The engine control dial has a built in potentiometer. When the
control knob is moved the output voltage (through "2 and 3"
terminals) will vary from the 5 V supplied from the e-EPOS
controller as shown in the graph.

2

1

1

1

VIEW ( POTENTIOMETER BOTTOM)

1st STEP

( 10 )

( 10 )

7th STEP

13th STEP

CCW
MECHANICAL
STOP

CW
MECHANICAL
STOP

2 3

2

3

1

2

3

4

2.5V

1.0V

4.0V

1ST 2nd 7th 12th 13th

CW
STOP

CCW
STOP

5

SETUP

(V)

0

FG000866

Figure 60

Reference

Number

Description

1 Knob

2 Potentiometer

(Variable Resistor)

Reference

Number

Description

SP001038

Page 69

Electrical System

ENGINE CONTROL CIRCUIT
DIAGRAM

2

12

89

1 6

72

ECU CON.1 (89-PIN)

18

VEHICLE CONN.

12 17

7 11

54

36

35

(ECU CONNECTOR)

71

53

AMP 040 12P

5

11

AMP 070 16P

6 4578 3 2 1

12

6

(CN5)

12131516 14 11 10 9

4

10

7

AMP 040 20P

17

813 2 10 9

79 8 20 1819

3

6 5 4

13141516

(CN4) (CN3)

7

18

AMP 040 28P

14

2 1

8 7

456 8

1612 11 10

9

3 7 6

15

(CN7)

AMP 070 18P

8 7

1718561516 14

1

11

3114

12

13

9

2021

12

10 9

10 8

19

(CN2)

4 3 2 15

10111213 9

(CN6)

AMP MIC 21P

56

1517 16

124 3

1213 1114

(CN1)

(CONN.1)

1-03

1-08

1-09

1-40

1-06

1-05

1-10

1-11

1-02

1-34

1-33

1-53

1-52

CONN

1-51

VEHICLE

1-35

CN7-5

CN7-4

CN6-10

CN7-6

CN6-2

CN6-1

CN6-9

BBR

10A

15A

+(5V)

CN3-15

CN3-16

SIG

CN3-17

GND

3

HIGH

CW

LOW

2

1

CN1-9

CN1-8

15A

CN4-4

CN4-5

CN4-6

CAN

CN1-2

CN1-1

15A

CN2-15

Py

Px

CN2-16

1

3

29

30

4 26

28

25

24

17

26

27

26

26

FG008166

Figure 61

Reference

Number

Description

1 Instrument Panel

3 Engine Controller

4 e-EPOS Controller

17 Engine Control Dial

24 Battery

25 Battery Relay

26 Fuse

27 Starter Switch

28 Fusible Link

29 Pressure Switch (Py)

30 Pressure Switch (Px)

Reference

Number

Description

SP001038Electrical System

Page 70

AUTOMATIC DECELERATION
CONTROL (AUTO IDLE
CONTROL)

POWER

1

5

2

3

6

7

AUTO

4

ESC

8

E/G

FG000798

2

4

1

3

5 5

Figure 62

Reference

Number

Description

1 Instrument Panel

(Auto Idle Switch)

2 e-EPOS Controller

3 Engine Controller

4 Engine Control Dial

5 Pressure Switch

Reference

Number

Description

SP001038

Page 71

Electrical System

If the machine is idling without the controls being operated or is
waiting for a dump truck the engine speed is automatically
lowered. Once the controls are operated and work is being
started the machine will be restored to the previous settings. As
a result, noise and fuel consumption will be reduced. This
function can be selected or cancelled through the Auto Idle
Selector Switch on the instrument panel.

The initial setting at start-up is with this switch in the select
position. Approximately 4 seconds after this function is selected,
if all work levers are in the neutral position, the e-EPOS
controller compares the automatic reduction signal with the
signal set by engine control dial. The lower of the two signals is
selected, the e-EPOS controller sends a signal to the engine
controller to control the engine speed.

The neutral status of the machine is detected by the two
pressure switches in the control valve. When the work levers are
in the neutral position, the switch is in the "OFF" position.

SP001038Electrical System

Page 72

ENGINE OVERHEAT
PROTECTION SYSTEM

C

H

E

F

H

C

POWER

1

5

2

3

6

7

AUTO

4

ESC

8

E/G SPEED

02/05 [MO] 11:30

1700

RPM

CHECK

E/G

(E/G overheating signal)

(E/G overheating signal)

(Pump control signal)

FG000802

6 6

4 4

5

7

31

2

1

3

Figure 63

Reference

Number

Description

1 Instrument Panel

2 e-EPOS Controller

3 Engine Controller

4 Main Pump

5 Aux Pump

6 Control Valve

10 E.P.P.R. Valve (Electromagnetic

Proportional Pressure Reducing

Valve)

31 Warning Buzzer

Reference

Number

Description

SP001038

Page 73

Electrical System

When the engine coolant temperature increases to over 107°C
(225°F), the engine controller detects it from the sensor
mounted in the coolant line and will send a signal to the e-EPOS
controller. The e-EPOS controller sends a overheat signal to the
instrument panel turning "ON" the warning light and buzzer
simultaneously.

Also, the e-EPOS controller returns an overheat signal to the
engine controller and changes power mode to standard mode.
The engine speed is then set to a low speed by the engine
controller.

When coolant temperature falls below 95°C (203°F), normal
operation will resume.

SP001038Electrical System

Page 74

POWER BOOST MODE

Operation

C

H

E

F

H

C

POWER

1

5

2

3

6

7

AUTO

4

ESC

8

E/G SPEED

02/05 [MO] 11:30

1700

RPM

CHECK

P

O

W

ER

U

P

E/G

FG000800

6 6

16

4 4

5

2

20

18

1

11

3

Figure 64

Reference

Number

Description

1 Instrument Panel

2 e-EPOS Controller

3 Engine Controller

4 Main Pump

5 Aux Pump

6 Control Valve

11 Solenoid Valve (Boost)

16 Main Relief Valve

18

Breaker/Boost/Shear Selector

Switch

20

Power Boost Switch (Top of

Right Work Lever)

Reference

Number

Description

SP001038

Page 75

Electrical System

The Power Boost function is used to temporarily increase the
main relief pressure to enhance excavation ability. When the
breaker/boost/shear selector switch is set to "BOOST" and the
power boost button on the center of the right-hand work lever
(joystick) is pressed during work, the e-EPOS controller will
activate the power boost solenoid valve and increase the relief

valve pressure from 330 - 350 kg/cm

2

(4,700 - 5,000 psi). The

excavation ability is increased by approximately 6%.

When the power boost function is in activated, a power boost
symbol appears on the information display department of
instrument panel.

NOTE: Do not use this switch for more than 10 seconds.

SP001038Electrical System

Page 76

Power Boost Control - Circuit Diagram

(C4)

14

AMP 070 18P

(CN3)(CN4)(CN5)

12

6

AMP 040 12PAMP 070 16P

11 10 912

3 2 14

1516 14

6

78135

AMP 040 20P

133141516171820 19

10 6 5 4789

79 811 10

13 245

8 7 56

1718 1516

1112

2 1

CN1-8

CN1-9

CAN

CN7-6

CN4-6

CN2-2

CN1-11

(POWER MAX)

(POWER MAX / BREAKER)

CN6-10

CN6-9

CN7-5

CN7-4

CN4-5

CN4-4

CN6-2

CN6-1

CN1-1

CN1-2

15A

15A

AMP 040 28P

72 14 356 8

15

168 710 912 11

(CN7)

4 3 2 156

10111213 914

(CN6)

19

84910

3 2 1

1213

20

21

11 10 9

(CN2)

1

AMP MIC 21P

567 24 3

(CN1)

1517 1618 121314 11

(Center)

6123

14

11

6

15

16

13

PRESS

PST

SHEAR

TML

3

1 0

10

9

UP

BREAKER

2

20A

FG000586

1

2

26

26

11

18

26

25

24

20

Figure 65

Reference

Number

Description

1 Instrument Panel

2 e-EPOS Controller

11 Solenoid Valve (Pressure Up)

18 Breaker/Boost/Shear Selector

Switch

20 Power Boost Switch (Top of

Right Work Lever)

24 Battery

25 Battery Relay

26 Fuse

Reference

Number

Description

Electrical System

SP001038

Page 77

SP001038Electrical System

Page 78

AUTOMATIC TRAVEL SPEED
CONTROL

E/G

FG000799

6 6

7

8

4 4

5

13

15

17 2 19

3

Figure 66

Reference

Number

Description

2 e-EPOS Controller

3 Engine Controller

4 Main Pump

5 Aux Pump

6 Control Valve

7 Pressure Switch (Py Port)

8 Pump Pressure Sensor

13 Solenoid Valve (High speed)

15 Travel Motor

17 Engine Control Dial

19

Selector Switch For Automatic

Travel

Reference

Number

Description

SP001038

Page 79

Electrical System

If the automatic travel speed control switch is set to the "OFF"
position, the travel motor will run in the I-speed (low speed)
range. If the selector switch is set to the "I" position, the travel
motor will run in the II-speed (high speed) range. If the selector
switch is set to the "II" position, the e-EPOS controller will
monitor the main pump discharge pressure and automatically
select the "ON" - "OFF" status of the II - speed travel solenoid
valve based on the travel load. The travel speed is changed
between the I-speed and the II-speed mode.

The travel load is monitored by the two pressure sensors in the
discharge lines of the front (upper) and rear (lower) pumps.

When the travel load is high (pressure over 300 kg/cm

2

(4,300
psi) the solenoid valve is turned "OFF" and I-speed (low) is
selected. In the case when the travel load is low (pressure under

160 kg/cm2 (2,280 psi), the solenoid valve will be turned "ON"
and the II-speed will be selected. But, if the engine speed control
switch dial is set below approximately 1400 rpm, the travel
speed will be set to I-speed mode.

SP001038Electrical System

Page 80

Automatic Travel Speed Control - Circuit

Diagram

AMP 040 20P

17

1112

3

4

1516 14

6

78

13

5

(CN5)

1820 19

10 89

79 811 1012

10 9

(CN4)

6

2 1

13 245

AMP 070 16P AMP 040 12P

CN1-8

CN1-9

SIG

+

SIG

-

-

CN3-3

CN3-2

CN3-4

+

CN3-1

1568 7 24 3

4

910

3 2 1

8 7 56

AMP 040 28P

(CN7)

24 356

810 912 11

1718

111213141516

(CN3)

236 5 4 17

1213 11 10 915 1416

(CN2)

4 3 2 157 61 8

10111213 91415

(CN6)

167

(CN1)

1517 1619 18 13142021 12 11

3

CN3-17

GND

HIGH

AMP 070 18P

CN3-16

SIG

+(5V)

CN3-15

CW

2

1

LOW

AMP MIC 21P

8

5

2

CN2-5

CN2-4

7

6

II

I

II

0

0

I

3

CN1-12

(C3)

CN1-1

CN1-2

15A

15A

15A

8

9

2

26

26 26

25

24

19

17

13

FG000587

Figure 67

Reference

Number

Description

2 e-EPOS Controller

8 Pressure Sensor (Front Pump)

9 Pressure Sensor (Rear Pump)

13 Solenoid Valve (High speed)

17 Engine Control Dial

19

Selector Switch For Automatic

Travel

24 Battery

25 Battery Relay

26 Fuse

Reference

Number

Description

SP001038

Page 81

Electrical System

SELF-DIAGNOSTIC FUNCTION

e-EPOS Controller

The system operation status and malfunction codes can be
checked through the display on top of the e-EPOS controller box
the rear cover behind the operator's seat.

1. Power Monitor

This LED is turned "OFF" when the input voltage to the
e-EPOS controller is below 18.5 ±1 V or above 32.5 ±1 V.
Stays "ON" while in normal range.

2. Engine Speed Monitor

This LED light flashes according to the engine speed. The
flashing interval is proportional to the engine speed.

1

2

4 3

FG000588

Figure 68

Reference

Number

Description

1 Upper Digit

2 Lower Digit

3

Engine Speed Monitor LED

(Flash Interval Increases With

Engine Speed.)

4

Power Monitor (Stays "ON"

While Power Is In Normal

Range,)

Reference

Number

Description

SP001038Electrical System

Page 82

3. Normal Operation Display Readout

4. Communication Monitor

What are shown in the 7-SEGMENT LED are same as
those in the Error Codes.

Mode Selection

Display Readout

Operation Status

Upper Digit Lower Digit

Power Mode

Power Mode

Normal Operation
Power Mode

Standard Mode

Normal Operation
Standard Mode

Work Mode

Digging

Normal Operation
Digging Mode

Trenching

Normal Operation
Trenching Mode

HAOH340L

HAOH350L

HAOH370L

HAOH380L

Error Code Indication Code Fault Location

V201 01 Communication error in instrument

panel.

V202 02 Communication error in engine

controller.

SP001038

Page 83

Electrical System

AIR CONDITIONER SYSTEM

Outline

Solid-type heater and air conditioner are installed in the cover
behind the operator's seat.

Temperature of the operator's room is adjusted automatically to
the temperature set by operator.

FG000784

A

A

C

B

C

Figure 69

SP001038Electrical System

Page 84

(Please refer to the Operation Manual for detailed full automatic
control.

Vent mode selects the direction of discharged air.

Outlets by vent modes

Internal and External Filters

Internal and external air purification filters are installed for the
operator's room.

Filters should be cleaned every 500 hours.

If machine operates in an excessively contaminated
environment, filters should be cleaned more frequently and if
necessary, replaced with new ones.

How to Check Internal Air Filter

1. Press both levers on the left and right side at the top of the

filter installed at the rear of the operator's seat.

How to Check External Air Filter

1. Open the door at the left side of machine and loosen four

marked bolts to remove the cover (1, Figure 71).

Modes

Outlets A A+B B B+C C

FG000422

Figure 70

TOP

Donaldson.

FG000440

1

Figure 71

SP001038

Page 85

Electrical System

2. Turn marked knobs (1, Figure 72) at the rear side of the

cabin to open the cover.

3. Remove the filter attached to the cover and clean the

contaminated filter using compressed air.

4. Close the cover, replace the knobs, and secure the cover

to the support with butterfly bolts.

FG000441

1

Figure 72

FG000342

Figure 73

SP001038Electrical System

Page 86

Air-Conditioning System Layout

11

1

2

3

5

7

5

4

9

8

6

6

10

FG007144

Figure 74

Reference

Number

Description

1 Air Conditioner/heater Unit

2 Condenser

3 Compressor

4 Receiver Dryer

5 Discharge Hose

6 Suction Hose

7 Liquid Hose (1)

8 Liquid Hose (2)

9 Ambient Temperature Sensor

10 Sun Sensor

11 Control Panel

Reference

Number

Description

SP001038

Page 87

Electrical System

Air Conditioner/heater Circuit Diagram

44B44A

45B45A

49A

114C

142B

142A

48A

167B

49B

48B

116A

167C

115A

112A

114A

113A

99

116B

167A

115B

112B

114B

113B

47B

47A

43A

111A

110A

109A

108A

107B

106B

43B

111B

110B

109B

108B

107A

99

106A

46A

105B

168B

42E

42B

54E

130C

105A

168A

46B

42D

42C

47C

MODE F/BACK

CN9-17

0.5YW

CN10-10

(CN11)

4 3

KET 4P

2 1

(CN10)

141920 18 17 16 15 101113 12

18

AMP 040-III 20P

89 7 6 2 15 4 3

8

(CN8)

AMP 070 12P

(CN9)

1517 16 1214 13 911 10 12 11 10

AMP 070 18P

6 57 4 13 2 5 4

6789

123

CN8-1

0.5LgR

CN10-14

AMP 18P + 12P

CN8 CN9

CN8-4

0.85YG

0.5YR

SUN LOAD SENSOR

0.5Lg

CN8-3

-2 1+

CN8-5

0.5LY

SENSOR

AMBIENT TEMP

2

0.85BL

0.85YG

1

SENSOR

CN10

AMP 20P

2

CN10-17 1

INCAR

CN11

KET 4P

WATER

SENSOR

CN10-19

CN8-2

0.5OrB

CN9-2

CN9-4

1.25BL

0.5YW

CN9-1

0.5LgW

CN9-3

CN9-18

0.5LgB

0.5YR

CN9-10

1.25B

ACTUATOR

CN10-15

MIX F/BACK

GND

CN10-4

CN10-9

DUCT

SENSOR

WARM (P1)

Vref MIX

COOL (P2)

CN10-7

CN10-3

M

Temp. Control

0.85LW

CN10-1

CN10-2

CN10-20

CN10-12

CN11-1

CN10-11

CN10-13

CN9-16

CN9-14

0.5YB

0.5OrW

CN9-15

CN9-12

0.5OrR

0.5GrY

CN9-13

CN8-12

0.5GrG

0.5LW

CN8-11

1.25B

0.5LY

INTAKE

Vref MODE

VENT (P2)

REC (P2)

DEF (P1)

MODE

ACTUATOR

M

ACTUATOR

M

FRE (P1)

BLOWER

CN10-6

­M

+

FET

0.85B

0.85BW

A/C THERMO (LOW)

CN9-8

CN8-10

0.5LB

0.5LG

0.85LR
RECEIVER DRIER

ILL

LED 1~12

A/C CONTROL PANEL

0.5WR

1.25LR

CN9-5

CN9-11

0.85LR

CN9-6

1.25LR

CN10-5

CN10-16

BLOWER

RELAY

CN11-4

A/C

RELAY

AIRCON UNIT

CN10-18

CN10-8

CN11-2

DIODE 4

0.85B

COMPRESSOR

24V

BATT.

FUSIBLE LINK

LAMP SWITCH

0.5RW

BATTERY RELAY

20A

STARTER SWITCH

FG001463

Figure 75

Air Conditioner/heater Unit

Air Flow Diagram

External Air Inlet

Vent

Front

Outlet

VENT

Vent Rear

Outlet

Cold Box

Outlet

DEF

Outlet

Internal Air Inlet

Foot

Outlet

External Air

Figure 76

Page 88

DEF

FOOT

COOL

WARM

DOOR

-MIX

Heater

Core

DOOR

-INTAKE

Internal Air

Evaporator Fan

FG001359

SP001038Electrical System

SP001038

Page 89

Electrical System

Door Open by Vent Modes

Main Components

Door

Mode

Vent Bi-level Foot Def/foot Def

Vent 100 60 0 0 0

Foot 0 40 100 80 60

Def 0 0 0 20 40

FG007754

Actuator

- Temp
Control

A/C

Relay

Duct

Sensor

Blower

Relay

Air Flow

Control
Module

Blower

Motor

Actuator

- Internal/external
Air Exchanger

Internal

Air Sensor

Internal

Air Filter

Evaporator

Water Temp

Sensor

Actuator

-Wind Direction
Control

Figure 77

Actuator - Wind Direction Control

Change of discharged air flow according to selected wind
direction mode

Change of wind direction: Direction changes in the order of
VENTo BI-LEVEL o FOOT o FOOT/DEF o VENT.

Actuator - Temperature Control

Change of discharged air temperature by controlling the position
of temperature control door.

Figure 78

Actuator - Wind Direction Control

Wind Direction Mode Output Terminal Voltage

Vent

Bi-level 1.3 ± 0.2V

c(+): CN10-10

0.5 ± 0.2V

Foot 2.45 ± 0.2V

Foot/def 3.5 ± 0.2V

b(-): CN10-4

Def 4.5 ± 0.2V

Actuator - Temperature Control

Set Temperature Output Terminal Voltage

Max cooling c(+): CN10-9

Max heating Above 4.5V

b(-): CN10-4

Below 0.4V

FG001361

Page 90

SP001038Electrical System

Actuator - Internal/external Air Exchange

CN10-20 CN10-2

FG001055

Figure 79

Mode Output Terminal Output

Intake P1(+), P2(-)

Moving of exchange door
by selecting intake.

Recirculate P1(-), P2(+)

Moving of exchange door
by selecting recirculate.

Air Flow Control Module

Air flow is controlled through the control of voltage between
GATE and SOURCE.

DRAIN

(CN10-1)

SOURCE

(CN11-1)

Figure 80

Air flow Output Terminal Output

1st

10 ± 0.5V

2nd 12.5 ± 0.5V

3rd 15 ± 0.5V

4th 17.5 ± 0.5V

CN11-2 CN10-1

5th 20.0 ± 0.5V

6th 22.0 ± 0.5V

7th More than 25V

GATE

(CN10-6)

FG001056

Input voltage is 27.5V.

The air flow is based on manual set.

Electrical System

SP001038

Page 91

Relay - Blower: Power is supplied to the blower motor when the

system is turned "ON."

Specifications

Rated voltage 24V

Rated current 20A

Relay - A/C: Power is supplied to the magnetic clutch of the
compressor.

Specifications

Rated voltage 24V

Rated current 10A

Figure 81

L S1

(+)

Duct Sensor: It is inserted in the core of the evaporator to
prevent freezing of the evaporator.

The sensor consist of negative characteristic thermistor that
resistant value increases and decreases when the temperature
rises and falls, respectively.

Temperature (°C) Resistance (K:)

0 11.36 ± 0.1

2 10.39 ± 0.2

2.5 10.17 ± 0.2

3 9.95 ± 0.2

3.5 9.73 ± 0.2

4 9.52 ± 0.2

5 9.12 ± 0.2

10 7.36 ± 0.15

25 4.02 ± 0.08

30 3.33 ± 0.07

Figure 82

Figure 83

B

S2

(-)

FG001058

Page 92

SP001038Electrical System

Water Temperature Sensor: It senses the temperature of

Figure 85

Temperature (°C) Resistance (K:)

-15 218.2 ± 7.5

0 97.83 ± 0.9

15 47.12 ± 0.7

25 30.0 ± 0.36

35 19.60 ± 0.3

FG001064

Figure 86

Temperature (°C) Resistance (K:)

-10 163 ± 4.9

0 96.9 ± 2.9

10 59.4 ± 1.8

20 37.4 ± 1.1

25 30 ± 0.9

30 24.2 ± 0.7

coolant water in the heater core.

Temperature (°C) Resistance (K:)

-10 55.8 ± 1.7

0 32.9 ± 0.9

15 15.76 ± 0.5

25 10.0 ± 0.3

35 6.5 ± 0.2

Internal Air Temperature Sensor: Built in the internal air filter,
it senses the internal temperature.

Figure 84

Ambient Air Temperature Sensor

Built at the bottom of the cockpit, it senses the temperature of
external air.

Electrical System

SP001038

Page 93

SP001038Electrical System

Page 94

Sun Sensor

Built beside the socket of spare power, it senses the quantity of
the sun radiation to optimize discharge temperature and air flow
as set by operator.

Control Panel

Appearance and Terminal Arrangement

Refer to "Air Conditioner and Heater" of operation manual.

83.7

76.2

67.7

58.8

46.6

36.0

21.4

1.0 2.0 3.0 4.0 5.0 6.0 7.0

LUX(x10,000)

OUTPUT VOLTAGE(mV)

FG001062

Figure 87

AUTO

AUTO

OFF

TEMP

A/C

A/C

MAX

OUTSIDE

SEL

MODE

FG001063

18

8

(CN8)

AMP 070 12P

(CN9)

1517 16 1214 13 911 10 12 11 10

AMP 070 18P

6 57 4 13 2 5 4

6789

123

Figure 88

SP001038

Page 95

Electrical System

Terminal Terms

Control Logic

CN Term No. Terms CN Term No. Terms

CN9

1 Temperature control

(warm)

CN8

1 Water temperature

sensor

2 Sensor ground 2 Duct sensor

3 Temperature control

Power (5V)

3 Sun sensor

4 Mix feedback 4 Ambient air temperature

sensor

5 Power (KEY "ON") 5 Internal air temperature

sensor

6 Back-up 6 -

7 - 7 -

8 A/C output (LOW) 8 -

9 - 9 -

10 Ground 10 D.P.S CHECK

11 Illumination 11 Air flow module (gate)

12 Intake/Recirculate

(Recirculate)

12 Blower motor (feedback)

13 Intake/Recirculate

(Intake)

14 Wind direction control

(VENT)

15 Wind direction control

(DEF.)

16 Wind direction control

Power (5V)

17 Wind direction control

(feedback)

18 Temperature control

(cool)

Categories Inputs System Operation

AUTO Set temperature

Internal air temperature
sensor

Ambient air temperature
sensor

Water temperature sensor

Sun sensor

1. Automatically adjust room temperature as set and then
next items.

Temperature, Wind direction, Recirculate/Intake, Air flow,
Compressor

2. Auto mode is released when manually setting any switch
except, Temperature Control switch in Auto mode.

3. Upon the releasing of Auto mode, all of functions except
selected switch are controlled automatically.

SP001038Electrical System

Page 96

Sensor
compensation

Set temperature

Internal air temperature
sensor

Ambient air temperature
sensor

Water temperature sensor

1. In case of sensor failure, following defaults are applied:

Internal air temperature sensor: 25°C, Ambient air
temperature sensor: 25°C, Duct sensor: -2°C

Temperature control actuator:

- Set Temperature 17 - 24.5°C: Max cooling, Set
Temperature 25 - 32°C: Max heating

Wind direction mode actuator

- VENT: VENT fix, modes other than VENT: Fixed to DEF

* Sun sensor is not compensated.

Max cooling/
heating control

Auto Setting 1. Set Temperature 32°C: Max heating

2. Set Temperature 17°C: Max cooling

* Max cooling/heating control is possible only in Auto mode.

Starting
Control of
Cooling

Auto mode

Duct sensor

1. Prevention of discharge of hot air before discharge
temperature drops enough in hot summer weather

2. Start conditions (AND condition)

(1) A/C on (AUTO or manual)

(2) Temperature sensed by the duct sensor is above 30°C

(3) Air flow: Auto mode

3. One time control in the cycle of engine OFF o engine run

4. Initial cooling control is executed when the Auto switch is
"ON" in the manual status (A/C "OFF" and manual control
of air flow) in 5 seconds after engine run.

5. Initial cooling control should be before max cooling.

6. Release condition (OR condition)

(1) A/C "OFF"

(2) Air flow: Manual control

(3) Release is possible with the "OFF" switch but not
allowed within 12 seconds (after Start "ON") while the
system is off using the "OFF" switch and during the time of
initial cooling control.

Categories Inputs System Operation

Temp Control

Actuator

Air Flow

Compressor

Intake/Recircle

Wind Direction Mode

Max Cooling (17 C) Max Heating (32 C)

FULL COOL FULL HOT

MAX HI AUTO HI

Forced ON OFF

Recircle Intake

VENT FOOT

SP001038

Page 97

Electrical System

Starting
control of
heating (1)

Water temperature sensor

Internal air temperature
sensor

Auto mode

Set Temperature

1. Start condition (AND condition)

(1) When wind direction mode is one of the following
modes in the Auto or manual control mode

- BI-LEVEL, FOOT or FOOT/DEF

(2) The Water temperature sensor is stable and the water
temperature < 73°C

(3) Air flow: Auto mode

(4) Set temperature > Internal air temperature + 3°C

* Air flow falls gradually up to 12 seconds when operation
released.

2. One time control in the cycle of engine OFF o engine run

3. Initial heating control should be before max heating.

4. Air flow is controlled only when the wind direction is in the
manual mode and BI-LEVEL, FOOT, or FOOT/DEF is set.

5. Control through the water temperature sensor for start.

6. Starting control of heating (2) starts in case of fault of the
water temperature sensor during controlling.

7. Operation release (OR condition)

(1) Only air flow is released if it is selected manually.

(2) When handling the wind direction mode switch, only
wind direction is released but the air flow control is
performed only for the remaining period of the starting
control of heater.

(3) When Max Cooling (17°C) is selected.

(4) Water temperature sensor > 73°C.

Categories Inputs System Operation

SP001038Electrical System

Page 98

Starting
control of
heating (2)

Water temperature sensor

Ambient air temperature
sensor

Internal air temperature
sensor

Auto mode

1. Entry condition (AND condition)

(1) Auto Mode

(2) Ambient air temperature < 5°C and difference between
ambient and internal air temperature d 5°C

(3) Failure of water temperature sensor

2. Only one time of engine OFF o engine run

3. Starting control of heating is before max heating.

4. Operation release (OR condition)

(1) Air flow: Manual selection

(2) When handling the wind direction mode switch, only
wind direction is released but the air flow control is
performed only for the remaining period of the starting
control of heater.

(3) Difference between internal and ambient air
temperature>15°C

(4) When Max Cooling (17°C) is selected.

5. Exceptional case

Starting control of heating is performed only once during
the remaining period if the entry condition is satisfied
within the starting control period that is the accumulation
of initial start times.

(Inclusive of Auto mode "ON" case within the period of
starting control of heater.)

* Air flow should be reduced slowly for up to 12 seconds in
case of exceptional entry case.

Categories Inputs System Operation