INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-80
Published 11-06-15, Control # 040-13
Limit Switches
See Figure 1-48 for the following procedure.
When operating, all limit switches should be closed, sending
input signals to the PC. If a limit switch opens, the PC sends
an output signal to affected system to stop and apply system
brake. Move control in the opposite direction away from limit
to correct the problem.
The yellow operating limit light and alert in the operator’s cab
is enabled if one of the operating limits is activated. Use
display switch to scroll up or down to identify and display
operating limit.
When a MAX-ER operating limit is enabled, the PC displays
the following message:
BOOM MAXIMUM UP - Mast stops hoisting at 80°, operable
only in Standard mode.
FUNCTION NOT PARKED:
• Drum 2 (boom hoist) cannot operate until load drum
(drum 3) is parked and vice versa.
• Drum 9 (front load drum) cannot be operated until
crawler travel is parked.
• Drum 4 (mast hoist) cannot operate until drum 5 (luffing
jib) is parked.
The red system fault light and alarm alert in the operator’s
cab is enabled if the crane PC detects a load pin fault (output
voltage from the pin that is greater than 9.8 volts).
When a MAX-ER system fault is enabled, the PC displays
the following message:
LOAD PIN - the MAX-ER counterweight assembly stops and
remains in last position and boom hoist stops and is
inoperable in up direction. All other crane functions remain
operable.
F
A
B
D
90QR
90QL
15 AMP
5M
RM-02
0
0
88MB
88MA
89GA
89F4
89P4
90RP
89L4
89J5
8K
RH PISTON END
STRAP CYLINDER
SENDER
LH ROD END
STRAP CYLINDER
SENDER
RH ROD END
STRAP CYLINDER
SENDER
LEFT STRAP
CYLINDER
LIMIT
REAR DRUM
PAWL
LIMIT
MAXIMUM
ANGLE
LIMIT
DRUM 9 BAIL
LIMIT
PUMP 2 FILTER ALARM
DRUM 9
ENCODER
SYSTEM FAULT
ALARM
25A
25
OPERATING LIMIT
ALARM
LIGHT
LIGHT
FIGURE 1-48
MAX-ER
PROGRAMMABLE
CONTROLLER
90QM
MAST
ACCUMULATOR
SENDER
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