6-4c TL33 Work Platform
Section
6.1 Electrical Schematic SERIAL NUMBERS: 1331 TO CURRENT
Table 6-1: Electrical Schematic Legend (Contd...)
REFERENCE NAME FUNCTION LOCATION
LS1,LS2,LS3
& LS4.
Outrigger
Limit
Switches.
activated when the outriggers are
deployed and taking load. +24V supply
from the batteries is routed through
these four limit switches, which are
wired in series, to the keyswitch and
provides power to the upper and lower
control boxes for operation of the boom
functions.
On Outrigger
supports.
LS5 Slew cut-out
limit switch.
This prevents slewing until the second
post is clear of the tow bar.
The normally closed contact is open and
the slew signal to pin 4 on the controller
is broken until the second post is clear
of the towbar.
On first post
under lower
boom.
MCU Motor
Control Unit.
This controls the speed of the electric
motor. Using the upper controls the
motor speed varies with the position of
the control joystick. Using the lower
controls the motor has different fixed
speeds for the various functions which
are programmed into the MCU using a
special calibrator.
Chasis
Subframe.
MOT 24V D.C.
Electric
Motor.
This motor is coupled to the hydraulic
pump which provides the oil flow and
pressure to operate the various machine
functions.
Chasis
Subframe.
RL1 Joystick
direction
relay.
This relay is energised when the joystick
is pushed foward. The contacts close
allowing +24V to be fed into only one
half of the contacts on the selector
switch. This then allows only one of the
two solenoids on each function spool to
be energised thus allowing only one
direction of motion when the joystck is
pushed forward.
Upper
Control Box
P.C.B.
RL2 Joystick
direction
relay.
This relay is energised when the joystick
is pulled backwards. The contacts close
and feed +24V to opposite set of
contacts on the selector switch as RL1
does. This then energises the opposite
solenoid for each function and provides
motion in the opposite direction when
the joystck is pulled back.
Upper
Control Box
P.C.B.
SOL1 Solenoid Solenoid used for activating hydraulic
valve to slew in the right direction
Back of first
post.
SOL2 Solenoid Solenoid used for activating hydraulic
valve to raise the first boom.
Back of first
post.
SOL3 Solenoid Solenoid used for activating hydraulic
valve to raise the second boom.
Back of first
post.
SOL4 Solenoid Solenoid used for activating hydraulic
valve to slew in the left direction
Back of first
post.
SOL5 Solenoid Solenoid used for activating hydraulic
valve to lower the first boom.
Back of first
post.
SOL6 Solenoid Solenoid used for activating hydraulic
valve to lower the second boom.
Back of first
post.
SW 1 Function
switch
Lower
Boom.
Sends power to the lower lift cylinder
solenoid which diverts oil to full bore or
annular side of lower lift cylinder.
Lower
control box.
SW 2 Function
switch
Upper
Boom.
Sends power to the upper lift cylinder
solenoid which diverts oil to full bore or
annular side of upper lift cylinder.
Lower
control box.
SW 3 Function
switch slew.
Sends power to the slew motor control
solenoid which diverts oil to the left or
right side of the slew motor.
Lower
control box.
SW 4 Switch-
3 position
selector
Sends power to selected solenoid valve
(lower lift, upper lift, tele & slew). Only
one function can be selected at any time.
Upper
Control Box.
REFERENCE NAME FUNCTION LOCATION
SW 5 Emergency stop
button.
Control circuit shut off. In series
with SW8.
Upper
Control
Box.
SW 6 Switch,
Emergency
Override.
Provides emergency power when
power is cut to the upper controls
due to an outrigger limit switch
de-activating.
Upper
Control
Box.
SW 7 Swith On/Off Allows +24V supply to feed upper
controls. Allows signals from tele
and lift functions to pass down to
the controller. Allows joystick
trigger signal to pass down do the
controller. (this switch is combined
in the same housing as SW13)
Upper
Control
Box.
SW 8 Emergency stop
button.
Control circuit shut off. In series
with SW5.
Lower
Control
Box.
TS 1 Tilt Sensor This is a warning device that will
sound if the machine tilts at an angle
greater than 3 degrees
Chasis
Subframe.
MOTOR CONTROL UNIT (PIN LEGEND)
PIN
No.
DESCRIPTION
1 Battery Discharge Indicator (B.D.I.) output
2 Not used - sw8 - Switch 8
3 Not used - 10V supply
4 sw4 - Switch 4 (Speed 4: slew speed from lower controls - Factory set at
13%)
5 Not used - Not connected.
6 24V supply (Must be greater than 14V)
7 Not used - Not connected.
8 sw1 - Switch 1 (speed 1: Max. variable speed for upper and lower lift
cylinders from upper controls - Factory set at 90%)
9 Not used - Not connected.
10 Not used - Not connected.
11 Not used - Not connected.
12 sw3 - Switch 3 (Speed 3: Boom speeds from lower controls - Factory set at
45%)
13 sw2 - Switch 2 (Speed 2: Max variable slewing speed from upper controls -
Factory set at 40%)
14 Accelerator (3.5V - 0V) - Input from joystick to vary motor speed from
upper controls.
15 Not used - Not connected.
16 Not used - Not connected.
17 Not used - Not connected.
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