Manitowoc 2250 Service And Maintenance Manual

Reference Only
HYDRAULIC AND AIR SYSTEMS 2250 SERVICE/MAINTENANCE MANUAL
2-10
Published 11-06-15, Control # 040-13
PROGRAMMABLE CONTROLLER
CALIBRATION PROCEDURES — PAST
General
To ensure proper operation of the crane functions, the
controls and pressure senders must be properly calibrated
as described below.
Controls Calibration
The controls must be calibrated at the following intervals:
• When a pump is replaced
• When a pump control (EDC or PCP) is replaced
• When a new programmable controller is installed
• When a new CPU board is installed
• When a new controller chip is installed
• When there is a noticeable increase in the time it takes a
crane function to engage when the handle is pulled back
from off
• Every 6 months
To calibrate the controls, proceed as follows:
1. Engage swing lock (past production) or park brake.
2. Calibrate pressure senders.
3. Start and run the engine at 2,100 RPM or higher.
4. Depress and hold swing holding brake switch (on swing
handle) for one minute.
5. Repeat steps 3.
and 4 a second time.
Pressure Sender Calibration
The pressure senders must be calibrated (zeroed) at the
following intervals:
• A new programmable controller is installed
• A new CPU board is installed
• A new controller chip is installed
• A pressure sender is replaced (see Pressure Sender
Replacement topic in this section).
• Displayed pressure is wrong
Be aware that if there is any residual pressure in the
system during the calibration process, the display
pressure reading in the cab may not reflect actual
system pressure. See Note regarding replacing a
pressure sender at the end of this procedure.
• Every 6 months
To calibrate the pressure senders, proceed as follows:
1. Stop the engine.
2. Turn on cab power switch.
3. Turn crane mode selector key counterclockwise to
confirm position and hold.
4. Press engine run/stop switch to run position.
5. Continue to hold crane mode selector key in confirm
position for one minute after performing above step.
6. Confirm that pressure senders are properly calibrated by
checking charge pressure on diagnostic screens (see
Diagnostic Display topic in Section 10 of this manual).
a. With engine off (key in run position), charge
pressure for each crane function should be 50 psi
(3,4 bar) or less.
b. With engine running, charge pressure for each
crane function should be within normal operating
range – approximately 275 (19 bar) at low idle to
400 psi (27,6 bar) at high idle.
NOTE: The cause of 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.
Before replacing a pressure sender, do the
following:
• Perform pressure sender calibration steps.
• Attach an accurate hydraulic pressure gauge
to the quick-coupler at the suspect pressure
transducer (see Section 2).
• If pressure appears on the gauge, bleed the
corresponding system so the gauge reads
zero pressure.
• Repeat calibration steps and check pressure
on the display in the cab with the engine
running at idle – the display reading and the
gauge reading should be the same.
• Before replacing a pressure sender, check the
signal voltage at the sender. It should be 1.0
volt against ground at 0 psi.
PROGRAMMABLE CONTROLLER
CALIBRATION PROCEDURES — CURRENT
General
To ensure proper operation of the crane functions, the
pressure senders and controls must be properly calibrated
as described below.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English