October 2008
"3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page 2-2
ELECTRICAL SYSTEM - GENERAL
The electrical control system consists of lower controls located on the machine base and upper
controls located on the machine platform. Emergency lowering controls are also located on the ma-
chine base.
Lower Controls
The lower controls will operate all functions except steering and drive.
Upper Controls
The upper controls will operate all functions including drive, steer, lift, and lower. A momentary bidirec-
tional rocker switch on the joystick provides the steering function. The control system for operation of
drive, steer, lift, and lower are electric-over-hydraulic type. The drive system is a proportional system
controlled by position and direction of the upper controls joystick.
Emergency Lowering (3772ES)
The 3772ES utilizes a toggle switch and independent 12 Volts DC battery to open the down valve on
the lift cylinders, allowing hydraulic fluid to return to the hydraulic reservoir at a controlled rate.
Diagnostic LED
If the machine fails to operate, inspect the GP400 Module located
inside the control module. The LED located on the processor should
be
ON. If the LED is OFF or FLASHING, refer to Section 4: Trouble-
shooting.
ART_2391
15
Diagnostic LED
Master Disconnect Switch
Battery disconnect is provided in the control module to facilitate servicing and
also to prevent unauthorized use of machine by using a padlock.
ART_2387
ART_2755
Battery Charge Indicator
If the machine fails to operate properly, check the battery charge indicator located on
the lower control panel to ensure that the batteries have a proper state of charge.
Содержание 3072ES
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