Manitowoc 2250 Service Maintenance Manual

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-76
Published 07-19-16, Control # 249-01
Pressure Senders and Speed Senders
See Figure 1-47 for the following.
A counterweight strap cylinder pressure sender is located at
the rod end of each strap cylinder and the piston end of the
right side strap cylinder. The counterweight strap cylinder
pressure senders measure system pressures and send the
information as input voltages to the PC.
The drum 9 flange-mounted speed sender (encoder) detects
the speed and direction of the drum’s movement. The PC
receives this information as two out-of-phase square wave
voltages that are converted to “counts.”
The PC then determines when to apply the brake or adjust
the pump’s flow.
Limit Switches
See Figure 1-47 for the following.
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 the affected system to stop and apply the
system brake. Move the control in the opposite direction
away from the limit switch 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 the
display switch to scroll UP or DOWN to identify and display
the operating limit.
When a MAX-ER operating limit is enabled, the PC displays
the following messages:
• 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’s PC detects a load pin fault
(output voltage from the pin that is greater than 9.8 V).
When a MAX-ER system fault is enabled, the PC displays
the following message:
• LOAD PIN:
- THE MAX-ER’s counterweight assembly stops and
remains in last position, and the boom hoist stops
and is inoperable in UP direction. All other crane
functions remain operable.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English