Mec Speed Level 2684 RT Service And Parts Manual page 55

E S
LECTRICAL
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 machine base.
L C
OWER
The lower controls will operate all functions except the steer,
drive and level functions.
U C
PPER
The upper controls will operate all functions including drive,
steer, lift, and lower. A momentary bi-directional 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.
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.
The electric Emergency Lowering switch will
continue to function when the Emergency
Stop switches are depressed.
E
MERGENCY
The machine utilizes a toggle switch to open the down valve on the lift cylinder, allowing
hydraulic fluid to return to the hydraulic reservoir at a controlled rate.
D
IAGNOSTIC
If the machine fails to operate, inspect the GP400 Module located inside the control
box. The LED located on the processor should be ON. If the LED is OFF or FLASHING,
refer to Section 4: Troubleshooting.
"3084 Speed Level™ Sigma Lift" Service and Parts Manual
– G
YSTEM ENERAL
ONTROLS
ONTROLS
S
TOP
L
OWERING
LED
E
L E C T R I C A L
Lower Controls
Figure 2-2: Emergency Stop Switches
Lower Controls
ART_2506 R2
S – G
Y S T E M E N E R A L
Figure 2-1: Diagnostic LED
GP400
Module
Terminal
Block
Module
Diagnostic LED
ART_3093
Upper Controls
ART_2507 R2
November 2009
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