Reference
Only
Manitowoc
Published 05-16-17, Control # 233-03
1-29
999 SERVICE/MAINTENANCE MANUAL
INTRODUCTION
1
The PC controls lowering speed by varying the voltage to
pump EDC and motor PCP in relation to handle movement.
As front drum handle is pushed forward, the PC sends a
signal to increase the front drum pump swashplate angle.
The PC also sends a signal to reduce the displacement of
the motor. The PC is continuously balancing the system
pressure and the motor displacement angle so the motor
displacement goes to minimum when handle is all the way
back, if the torque on the motor is not too high. Knowing the
displacement of the motor, the PC may then control the
speed that the motor turns by regulating the flow through the
pump.
The load weight attempts to drive motor faster than return
fluid can return to low-pressure side of pump. System charge
pump maintains fluid supply at a positive pressure to motor.
Pump swashplate position restricts returning fluid flow.
Pressure builds on fluid return side of closed-loop, acting as
a motor brake to control lowering speed.
When front drum handle is moved to neutral position, the PC
sends an output signal to front drum pump EDC to decrease
swashplate angle, reducing flow output. The PC also shifts
the motor back to maximum displacement for slower output
speed to slow the drum rotation. The PC shifts the pump
swashplate through neutral until the EDC has a slightly
positive signal. This shifts the swashplate in the positive
direction and builds pressure on high-pressure side of
closed-loop. The PC stores load-holding pressure in
pressure memory. After control handle neutral switch opens,
the PC sends an output signal to disable brake release
FIGURE 1-19
WA-01
8D
8
WB-10
WB-09
SELECT
CONFIRM
CRANE MODE
8T
0
0
8
WB-26
WB-33
DOWN SCROLL
UP SCROLL
WA-22
WA-23
K1
F4
F8
REAR DRUM
PRESSURE TRANSDUCER
FRONT DRUM
SYSTEM FAULT
BUZZER
25A
25
OPERATING LIMIT
BEEPER
5A
5A
+
_
ENGINE
10A
5D
5A
F15
STOP
STOP
3
RUN
START
7
MS1
K1
5DA
8
8P1
50 AMP
CB7
PRESSURE TRANSDUCER
SEAT SWITCH
WB-34
999CSM1-118
F12
3A
REGULATED 10V DC OUTPUT
RAISE
OFF
LOWER
FRONT DRUM
WA-03
WD-18
WD-19
DIGITAL DISPLAY
WC-05
FRONT DRUM
B
A
EDC
RAISE
OFF
LOWER
REAR DRUM
WA-04
REAR DRUM
WC-06
B
A
EDC
3
2
3
1
RIN
BLOCK UP LIMITS
HS
16
FRONT DRUM
WD-33
HS
20
FRONT DRUM
WD-08
WC-18
WD-27 ROTATION INDICATOR
FRONT DRUM
19
HS
FRONT DRUM PAWL IN
WD-32
BRAKE
WD-24
FD
PCP
FRONT DRUM
WD-25
RD
PCP
REAR DRUM
PUMP CONTROL
PUMP CONTROL
MOTOR CONTROL
MOTOR CONTROL
WD-28
ROTATION INDICATOR
REAR DRUM
WD-35
REAR DRUM
24
HS
REAR DRUM PAWL IN
WD-34
25
HS
PAWL OUT
PAWL OUT
WD-09
WC-19
21
HS
REAR DRUM
BRAKE
3
8
FRONT DRUM
SPEED
ENCODER
F
A
B
D
SHAFT
WD-01
WD-02
REAR DRUM
SPEED
ENCODER
F
A
B
D
SHAFT
WD-03
WD-04
3
11
PROGRAMMABLE
CONTROLLER
8D
8
F4
5A
3
14
3
12
3
13
3
9
3
10
3
6
Содержание 999
Страница 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc 999 ...
Страница 2: ...R e f e r e n c e O n l y ...
Страница 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Страница 173: ...R e f e r e n c e O n l y Manitowoc Published 05 16 17 Control 233 03 4 19 999 SERVICE MAINTENANCE MANUAL BOOM 4 ...
Страница 174: ...R e f e r e n c e O n l y BOOM 999 SERVICE MAINTENANCE MANUAL 4 20 Published 05 16 17 Control 233 03 ...
Страница 297: ...R e f e r e n c e O n l y ...
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