CN-1 CN-2 CN-3 Pin
No. Signal name Input/
output Pin
No. Signal name Input/
output Pin
No. Signal name Input/
output
1 Boom bottom pressure sensor Input 1 NC Output 1 VB (controller power) Input
2 R pump pressure sensor Input 2 Swing emergency switch Input 2 VIS (solenoid power) Input
3 Arm angle potentiometer Input 3 NC Input 3 SOL_COM (solenoid common gnd)
4 Signal GND Input 4 232C_RxD Input 4 Battery relay drive Output
5 Abnormality in auto-greasing
con-troller Input 5 Overload sensor (ON/OFF) Input 5 Governor motor A phase (+) Output
6 Overload alarm valid switch Input 6 LS-EPC Output
6 NC Input 7 Model selection 4 Input 7 Travel junction SOL Output
7 Overload sensor (analog) Input 8 Attachment circuit selector signal Output 8 NC Output
8 F boom pressure sensor Input 9 NC Output 9 Bucket CURL pressure SW Input
9 Boom angle potentiometer Input 10 NC Input 10 Boom RAISE pressure SW Input
10 Signla GND Input 11 NC Output 11 VB (controller power) Input
11 Knob SW Input 12 CAN shield 12 VIS (solenoid power) Input
12 NC Input 13 Model selection 5 Input 13 SOL_COM (solenoid common gnd)
13 Governor motor FB potentiometer Input 14 232C_TxD Output 14 KEY_SIG Input
14 Boom head pressure sensor Input 15 NC Input 15 Governor motor A phase (-) Output
15 NC Input 16 Travel steering signal pressure SW Input 16 PC-EPC Output
16 SENS_PWR Output 17 Model selection 3 Input 17 Pump merge/divider solenoid Output
17 Key Switch (Terminal C) Input 18 Relay drive signal for arm crane Output 18 Heater relay drive Output
18 NC Input 19 NC Output 19 Bucket DUMP pressure switch Input
19 Throttle potentiometer Input 20 NC Input 20 Boom LOWER pressure switch Input
20 NC Input
21 S_NET Input/
output
21 GND (controller GND)
21 GND (analog GND) 22 VIS (solenoid PWR) Input
22 POT_PWR Output
22 CAN0_L Input/
output
23 SOL_COM (solenoid common gnd)
23 Key switch (terminal ACC) Input 24 KEY_SIG Input
24 Arm crane relay actuation
observa-tion Input 23 CAN1_L Input/
output
25 Governor motor B phase (+) Output 26 Service flow adjustment EPC (1) Output 24 Flash memory write permission
sig-nal Input 27 Travel Hi/Lo selector solenoid Output
28 2-stage relief solenoid Output
25 NC Input 29 Swing pressure switch Input
26 NC Input 30 Arm IN pressure switch Input
27 Model selection 2 Input 31 GND (controller GND)
28 NC Input 32 GND (controller GND)
29 GND (pulse GND) 33 GND (controller GND)
30 NC Input 34 NC
31 GND (S_NET GND) 35 Governor motor B phase (-) Output
32 CAN0_H Input/
output
36 NC Output
37 Swing parking brake solenoid Output
33 CAN1_H Input/
output
38 NC Output
39 Travel pressure switch Input
34 GND (232C GND) 40 Arm OUT pressure switch Input
35 Service valve pressure switch Input
36 NC Input
37 Model selection switch 1 Input
38 Swing lock switch Input
39 GND (pulse GND)
40 Engine speed sensor Input
★ For the self-diagnosis function, see "TROUBLE SHOOTING".
Control function 1
Engine/Pump composite control function
2
Pump/Valve control function
3
One-touch power maximizing function
4
Auto-deceleration function
5
Auto-warm-up/Overheat prevention function Electronic control system
6
Swing control function
7
Travel control function
8
ATT flow control, circuit selector function (option)
Self-diagnosis function
1. Engine and Pump control function
SJP08754 OR 08908
• The operator can set the work mode switch on the monitor panel to mode A, E, or B (or L) and select proper engine torque and pump absorption torque according to the type of work.
• The engine throttle and pump controller detects the speed of the engine governor set with the fuel control dial and the actual engine speed and controls them so that the pump will absorb all the torque at each out-put point of the engine, according to the pump absorption torque set in each mode.
: The L mode is on the multi-monitor specifi-cation machine only.
SJP08755 OR 08909
SJP08756 OR 08910
SJP08757 OR 08911
1) Control method in each mode Mode A
• Matching point in mode A: Rated speed
• If the pump load increases and the pressure rises, the engine speed lowers.
At this time, the controller lowers the pump discharge so that the engine speed will be near the full output point. If the pressure low-ers, the controller increases the pump dis-charge so that the engine speed will be near the full output point.
By repeating these operations, the controller constantly uses the engine near the full out-put point.
Model PC200-7, PC220-7
Mode A 106.6 kW/1,900 rpm {143 HP/1,900 rpm}
SJP08758 OR 08912
SJP08759 OR 08913
SJP08760 OR 08914
Mode E / Mode B / (Mode L)
• At this time, the controller keeps the pump absorption torque along the constant horse-power curve and lower the engine speed by the composite control of the engine and pump.
By this method, the engine is used in the low fuel consumption area.
: The L mode is on the multi-monitor specifica-tion machine only.
Mode Digging Breaker Finishing
Partial output point 85% 75% 70%
Model PC200-7, PC220-7
Mode E 123 HP / 1,750 RPM
Mode B 108 HP / 1,650 RPM
(Mode ❈L) 99 HP / 1,800 RPM
SJP08761 OR 08915
SJP08762 OR 08916
SJP08763 OR 08917
2) Function to control pump during travel
• If the machine travels in mode A, either of engine speed and pump absorption torque does not change.
• If the machine travels in mode E or B, the working mode does not change, but the engine speed and pump absorption torque rise to the same value as in mode A.
• If the machine travels in mode L, the work-ing mode and engine speed do not change, but the pump absorption torque is increased.
: The L mode is on the multi-monitor specifi-cation machine only.
3) Function to control when emergency pump drive switch is turned ON
• Even if the controller or a sensor has a trouble, the functions of the machine can be secured with pump absorption torque almost equivalent to mode E by turning on emergency pump drive switch (10).
In this case, a constant current flows from the battery to the EPC valve for PC and the oil pressure is sensed by only the EPC valve for PC.
SJP08764 OR 08920
Function
• The machine is matched to various types of work properly with the 2-stage relief function to increase the digging force, etc.
SJP08765 OR 08921
1) LS control function
• The change point (LS set differential pressure) of the pump discharge in the LS valve is changed by changing the output pressure from the LS-EPC valve to the LS valve accord-ing to the operataccord-ing condition of the actuator.
• By this operation, the start-up time of the pump discharge is optimized and the com-posite operation and fine control perfor-mance is improved.
2) Cut-off function
• When the cut-off function is turned on, the PC-EPC current is increased to near the maxi-mum value.
By this operation, the flow rate in the relief state is lowered to reduce fuel consumption.
• Operating condition for turning on cut-off function
The cut-off function does not work, however, while the machine is travelling in mode A or the arm crane operation width swing lock switch is turned on.
1. 2-stage relief function
• The relief pressure in the normal work is 34.8 MPa {355 kg/cm²}. If the 2-stage relief func-tion is turned on, however, the relief pressure rises to about 37.2 MPa {380 kg/cm²}.
By this operation, the hydraulic force is increased further.
• Operating condition for turning on 2-stage relief function
Condition
• The average value of the front and rear pressure sensors is above 27.9 MPa {285 kg/cm²} and the one-touch power maximiz-ing function is not turned on
Condition Relief pressure
• During travel
• When swing lock switch is turned on
• When boom is lowered
• When one-touch power maxi-mizing function is turned on
• When mode is operated
34.8 MPa {355 kg/cm²}
⇓ 37.2 MPa {380 kg/cm²}
08922