Manitowoc 2250 Service Maintenance Manual

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-74
Published 07-19-16, Control # 249-01
EPIC
®
Programmable Controller
See Figure 1-46 for the following.
The MAX-ER’s solenoid valves, cylinders, and motors are
monitored and controlled with electronic components of the
electronically-processed independent controls (EPIC)
system. The crane’s programmable controller (PC) and
MAX-ER PC are interfaced with serial wire RX3 (36) and
TX3 (37). The abbreviation (PC) assumes MAX-ER
programmable controller unless noted otherwise.
The PC receives and sends both analog and digital input/
output signals. Analog input/output signals are AC or DC
voltages or currents that are modulating. Digital input/output
voltages are 12 V nominal voltages that are either 0 = OFF or
1 = ON.
The PC uses the binary system. The binary system is based
on binary multiples of two and only recognizes 0 = OFF or 1
= ON. Basic counts of this system are exponents of the
number two. These exponents are formed in words, called
bytes, of eight numbers each. The eight numbers are 1, 2, 4,
8, 16, 32, 64, and 128 for an 8-bit controller or a combination
of up to 255 bytes. These bytes represent electrical inputs/
outputs to the controller. The controller processes this
information by comparing it to the programming
requirements and data information. The PC then provides
appropriate output commands to the control devices.
Operating controls or control handles send input voltage
command signals to the MAX-ER’s or the crane’s PC. The
PC compares these input voltages with feedback voltages
received from system monitoring sensors, memory
information, and directives entered into programming.
Monitoring sensors include limit switches, pressure senders,
encoders, counterweight level sensor, and backhitch load
pin sensor. The PC then sends a 12 V output signal to the
solenoid valves to control the system cylinders, brakes,
pawls, and other controls.
NOTE: The rated capacity indicator/limiter (RCL) system
has its own programmable controller and is part of
the EPIC system. For complete information see the
Rated Capacity Indicator/Limiter Operation
Manual.
The luffing jib (drum 5) operates the same as a load drum,
whether used as a whip line or luffing jib. For drum 9
operation, load drum holding pressure memory is used.
Before releasing the drum disc brake, the PC reverses the
voltage polarity to the travel (or main hoist in MAX-ER mode)
pump’s EDCs, stroking the crawler’s travel pumps in the UP
direction until pressure memory is met. The PC then
responds to the left control handle (drum 9) commands. See
Section 3 of the MAX-ER Operator Manual for description of
drum numbers and handle indicator lights.
RM-01
Sensor Voltage Input
Digital Display
Monitoring
Voltages Out
Memory
Voltages
to
Counts
to
Voltages
Command
Voltages in
Sensor Digital Input
Programmable
Controller (PC)
Processing
Control
Handles
Selectors
Switches
Limit
Switch
Remote
Control
P
Hydraulic
Solenoid
Hydraulic
Cylinder
Limit
Switch
Pressure
Sender
T
Voltage Out
Voltage Out
Voltage Out
Right Side Crane
Typical
Backhitch Load Pin
FIGURE 1-46

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English