Electrical System - General - Mec 4069RT Service And Parts Manual

E S
LECTRICAL
The electrical control system consists of lower controls located on the machine base
and upper controls located on the machine platform. The emergency lowering switch is
also located on the lower controls, and is electrically operated.
L C
OWER
The lower controls operate the glow, start, emergency down, lift and lower functions.
U C
PPER
The upper controls operate all functions including drive, steer, lift, and lower, along with
outrigger controls for machines equipped with outriggers. A momentary bi-directional
rocker switch on the joystick provides the steering function. The joystick also has an
enable bar switch that must be depressed to enable the Lift, Lower and Drive
functions.The control system for operation of drive, steer, lift, and lower are electric-
over-hydraulic type. The drive and lift systems are proportional systems controlled by
position and direction of the upper controls joystick.
E
MERGENCY
There are two red Emergency Stop switches: One located on the
upper controls and one on the lower controls. Activation of either
Emergency Stop switch will immediately cut electrical power to all
controls, thereby stopping all machine functions. Press the switch
to stop all electrical power and turn the switch clockwise to reset.
When both Emergency Stop switches are "set", the controls have
electrical power and the machine will operate.
NOTE: Both switches must be set or the machine will not operate.
E
MERGENCY
IF THE CONTROL SYSTEM FAILS WHILE THE PLATFORM IS ELEVATED,
USE THE EMERGENCY LOWERING PROCEDURE TO SAFELY LOWER THE
PLATFORM.
DO NOT CLIMB DOWN THE SCISSOR ASSEMBLY OR EXIT THE
PLATFORM.
The Emergency Lowering
System is used to lower the
platform in case of power
failure.
To lower the platform, push
down on the Emergency
Lowering Switch, located at
the Lower Control Box.
– G
YSTEM ENERAL
ONTROLS
ONTROLS
S
TOP
L S
OWERING WITCH
"4069RT" Service and Parts Manual
Figure 2-1: Emergency Stop Switches
Figure 2-2: Emergency Lowering Switch
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E S – G
L E C T R I C A L Y S T E M
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E N E R A L
March 2014
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