Manitowoc 2250 Service Maintenance Manual

Reference Only
HYDRAULIC AND AIR SYSTEMS 2250 SERVICE/MAINTENANCE MANUAL
2-10
Published 07-19-16, Control # 249-01
PROGRAMMABLE CONTROLLER
CALIBRATION PROCEDURES
General
To ensure proper operation of the crane functions, the
pressure senders and controls must be properly calibrated
as described below.
Calibrating the Pressure Sender
When the pressure sender calibration screen is accessed
and calibration is started, the crane's programmable
controller zeros the pressure senders to ensure accurate
pressure signals.
The pressure transducers must be calibrated at the following
instances and/or intervals:
• Installation of a new programmable controller
• Installation of a new CPU board
• Replacement of a pressure sender
• Every six months
• Incorrect displayed pressure
If there is any residual pressure in the system during the
calibration process, the display pressure reading in the cab
may not reflect the actual system pressure. See the note at
the end of this procedure regarding replacing a pressure
sender.
To calibrate pressure senders, proceed as follows.
1. Access the diagnostic screens by pressing the Limit
Bypass switch while scrolling up with the scroll switch.
2. Scroll until the Control Calibration screen appears
(Figure 2-10
).
3. Stop the engine (leave the ignition and cab power
switches on), turn the Limit Bypass key clockwise, and
hold the key. It is normal for the yellow Operating Limits
light to come on during this procedure.
Calibration will not start if the engine is running and the
screen shown in Figure 2-11
appears. Likewise, the
same screen appears and calibration stops if the engine
is started during calibration.
4. Repeat step 3
if the engine is running or if the engine is
started.
When calibration starts, the screen shown in Figure 2-12
appears to indicate the percentage of completion. It
takes approximately 1 minute to complete this process.
When calibration is complete, the Start screen shown in
Figure 2-10
reappears.
5. Check the data bank in the upper right corner of the
screen. If a pressure sender/pump failed the test, the fail
item’s binary number is displayed.
See Table 2-11
for a list of the binary numbers and their
corresponding descriptions.
Table 2-11. Pressure Sender Binary Numbers
The cause of a failed calibration or faulty display
pressure reading in the cab may not be the pressure
sender. The cause of the fault could be trapped air or
hydraulic pressure in the system.
6. Before replacing a pressure sender, perform the
following steps.
a. Perform the pressure sender calibration steps.
b. Attach an accurate hydraulic pressure gauge to the
quick-coupler at the suspect pressure transducer.
c. If pressure appears on the gauge, bleed the
corresponding system so the gauge reads zero
pressure.
d. Repeat the calibration steps and check the pressure
on the display in the cab with the engine running at
idle. The display reading and the gauge reading
should be the same.
e. Before replacing a pressure sender, check the
signal voltage at the sender. It should be 1.0 volt
against ground at 0 psi.
FIGURE 2-10
PRESS SENDER CAL
BYPASS TO START
FIGURE 2-11
PRESS SENDER CAL
ENGINE MUST BE OFF
Binary
No.
Pump
No.
Description
1 1 System Pressure (main hoist)
2 3 System Pressure (swing left)
4 3 System Pressure (swing right)
8 1 Charge Pressure (main hoist)
16 2 System Pressure (boom and luffing drums)
32 4 System Pressure (travel/drum 9 on MAX-ER)
64 5 System Pressure (left travel)
128 0 System Pressure (independent luffing)
FIGURE 2-12
PRESS SENDER CAL
___% COMPLETE

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English