Manitowoc Published 05-03-17, Control # 228-03 1-21
16000 SERVICE/MAINTENANCE MANUAL INTRODUCTION
Pressure Senders and Speed Sensors
Pressure senders monitor drum system pressures, right/left
travel system pressure, swing right/left system pressure,
swing brake pressure, and accessory system pressure.
Remote node controllers receive 0 to 5 volt input signals for
each system pressure sender. Pressure senders transmit
drum holding pressure information to the Node-1 controller.
Drum speed sensors detect the speed in rpm and direction of
drum movement. The Node-1 controller receives this
information as two out-of-phase square wave voltages that
are converted to counts. The controller compares the control
handle voltage with the pump output to determine when to
vary the pump stroke.
System Faults
See Figure 1-12 for the following procedure.
The Node-1 controller monitors and enables an alarm if any
system fault is detected and displays the fault on the crane
information screen (see Section 3 in this manual).
When operating, all limit switches are closed, sending an
input voltage to the Node-1 controller. If a limit switch is
opened, the system node controller sends a zero-output
voltage to that system pump EDC and brake solenoid. The
system pump de-strokes and the system brake valve shifts to
apply the brake. Move the control in the opposite direction
from the limit to correct the problem.
The limit bypass switch allows the crane to be operated
beyond the limits for crane setup or maintenance only. (For
example, to add wire rope on the load drum or to remove
wire rope from a load drum after an operating limit is
enabled.) The jib up limit bypass switch allows the jib
maximum up limit to be bypassed when the boom or luffing
jib is lowered to the ground.
Brake and Drum Pawl Operation
All load drums, boom/mast hoist, travel, and swing park
brakes are spring-applied and hydraulically released. Drums
3 (when configured with luffing jib), 4, and 5 have drum pawls
that are released with the selected park switch. When the
operator places the selected brake switch in the off-park
position, the selected drum pawl is disengaged from the
drum. Place the selected brake switch in the on-park position
to apply the pawl to drum.
The Node-1 controller releases the swing brake immediately
when swing brake switch is placed in the off-park position.
The travel Node-controller releases the brake with control
handle movement.
With a drum control handle command, the Node-1 controller
does not release the drum brake until the pressure memory
holding pressure is reached to hold the load.
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