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INTRODUCTION
999 SERVICE/MAINTENANCE MANUAL
1-10
Published 05-16-17, Control # 233-03
Boom, luffing jib, and fixed jib monitored components include
component angles, minimum/maximum angle limits, block-
up limits, and load sensors. The mast angle related to
transport position is also monitored.
NOTE:
RCL (Rated Capacity Indicator/Limiter) system has
its own PC and is part of the EPIC system. For
complete information on the RCL, see separate
RCL Operation Manual.
Standard Mode
Hoisting or lowering are performed with front drum, rear
drum, and auxiliary drum. Raising or lowering the boom is
performed with boom hoist. Control handle commands for
these operations are up or down.
When an up or down command is received from a control
handle in full power, the PC compares the input command
signal with sensor information to control braking and pump
output. Before releasing system brake, the PC sends a
positive voltage signal to pump EDC to stroke pump in up
direction until pressure memory is met. Enough system
pressure must be available to hold the load before the PC
sends an output signal to release brake. This prevents
momentary lowering of the load. The PC then responds to
control handle command.
The PC sends required negative or positive output voltage
command to load drum pump EDC. Pump EDC tilts
swashplate to stroke pump in control handle command
direction. The PC program provides precise pump control
needed for initial control handle movement. Fluid then flows
from pump to motor. The higher the command voltage, the
more the pump EDC tilts swashplate.
As selected control handle is moved back to neutral position,
the PC sends an output signal to pump EDC to decrease
pump output flow. When control handle is moved to neutral
position and motion is stopped, the PC sends an output
signal to apply system brake. A switch in control handle
opens circuit when control handle is in neutral position.
Other Crane Modes
The PC applies brakes and pawls, verifies brake and pawl
application, controls pump speeds, and selects control
handle operation depending on other crane operation
modes.
•
The Standard mode is for all normal load-handling
operations. Load drums can be operated in full power or
free fall (optional).
-
In drum 1 free fall mode, the front drum is allowed to
operate in free fall (optional).
-
In drum 2 free fall mode, the rear drum is allowed to
operate in free fall (optional).
•
In Clamshell
mode, the front drum operates as the
closing line and rear drum operates as the holding line.
Power down and closing features are turned on. Closing
line can be operated in free fall (optional).
•
In Dragline mode, the front drum operates dragline and
rear drum operates the hoist line. Drums can be
operated in full power or free fall (optional).
•
In Luffing Jib mode, the rear drum operates as luffing
hoist and must be rigged accordingly.
•
In Crane Setup mode, the PC allows operation of gantry
cylinders, mast raising cylinders, boom hinge pin
cylinders, counterweight pins, and carbody jacks.
Summary of Contents for 999
Page 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc 999 ...
Page 2: ...R e f e r e n c e O n l y ...
Page 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Page 297: ...R e f e r e n c e O n l y ...
Page 298: ...R e f e r e n c e O n l y ...