TL33 Work Platform 6-3a
Section
6.1 Electrical Schematic SERIAL NUMBERS: 1001 TO 1132
Table 6-1: Electrical Schematic Legend
REFERENCE NAME FUNCTION LOCATION
ALM1 Alarm,Tilt. Provides warning sound until outriggers
are deployed and the contacts on LS1,
LS2, LS3 and LS4 are closed. If one of the
switches opens during the operation of
the machine then the alarm sounds and
power is cut to the upper controls.
Upper Control
Box.
BAT Batteries x
(4). 6 Volts
each.
Power supply. Chasis
subframe
BC1 24V Battery
Charger.
This chargers the 4 x 6v batteries when
switched on and the line contactor is
unergised.
Chasis
Subframe.
D1 Diode Feeds +24V to pin 6 on the controller
from upper controls.
Lower control
box PCB.
D2 Diode Feeds +24V to pin 6 on the controller
when the keyswitch is switched to lower
controls.
Lower control
box PCB.
D3 TO D8 Diode Suppression diodes for coils of hydraulic
solenoids.
Lower control
box PCB.
D9 Diode Prevents feedback to upper controls
when slew cut out switch LS5 is activated
Lower control
box PCB.
D10 Diode Feeds a signal from lower lift cylinder
(down) solenoid to pin 4 on the controller
and prevents feedback to the lift
solenoid when other functions are
selected.
Lower control
box PCB.
D11 Diode Feeds a signal from upper lift cylinder
(down) solenoid to pin 4 on the controller
and prevents feedback to the lift solenoid
when other functions are selected.
Lower control
box PCB.
D12 Diode Feeds power to slew left solenoid from
upper controls and prevents feedback to
upper controls from the lower controls
Lower control
box PCB.
D13 Diode Feeds power to slew left solenoid from
lower controls and prevents feedback to
lower controls from the upper controls
Lower control
box PCB.
D14 Diode Feeds power to the lower cylinder (up)
solenoid from upper controls and
prevents feedback to upper controls from
lower controls.
Lower control
box PCB.
D15 Diode Feeds power to the lower cylinder (up)
solenoid from lower controls and
prevents feedback to lower controls from
upper controls.
Lower control
box PCB.
D16 Diode Feeds power to the upper cylinder (up)
solenoid from upper controls and
prevents feedback to upper controls from
lower controls.
Lower control
box PCB.
D17 Diode Feeds power to the upper cylinder (up)
solenoid from lower controls and
prevents feedback to lower controls from
upper controls.
Lower control
box PCB.
D18 Diode Feeds power to slew right solenoid from
upper controls and prevents feedback to
upper controls from the lower controls
Lower control
box PCB.
D19 Diode Feeds power to slew right solenoid from
lower controls and prevents feedback to
lower controls from the upper controls
Lower control
box PCB.
REFERENCE NAME FUNCTION LOCATION
D20 Diode Feeds power to the lower cylinder
(down) solenoid from upper controls
and prevents feedback to upper
controls from lower controls.
Lower control
box PCB.
D21 Diode Feeds power to the lower cylinder
(down) solenoid from lower controls
and prevents feedback to lower
controls from upper controls.
Lower control
box PCB.
D22 Diode Feeds power to the upper cylinder
(down) solenoid from upper controls
and prevents feedback to upper
controls from lower controls.
Lower control
box PCB.
D23 Diode Feeds power to the upper cylinder
(down) solenoid from lower controls
and prevents feedback to lower
controls from upper controls.
Lower control
box PCB.
D24 Diode Feeds power signal from joystick
trigger to pin 4 on controller when
emergency override is activated
Lower control
box PCB.
D25,D26 Diode Feed the signal which comes from
the keyswitch (set at upper controls)
to one of the alarm relay contacts
and prevent power getting to upper
controls when the alarm is activated
from the lower controls.
Lower control
box PCB.
D27 Diode Suppression diode for the coil of
direction relay 1 (RL1)
Upper
Control Box
P.C.B.
D28 Diode Suppression diode for the coil of
direction relay 2 (RL2)
Upper
Control Box
P.C.B.
D29 Diode Feeds power to joystick at upper
controls . It also prevents a feedback
to normal upper controls when the
emergency override is being
operated.
Upper
Control Box.
D30 Diode Feeds a signal from lower lift cylinder
(up ) solenoid to pin 4 on the
controller and prevents feedback to
the lift solenoid when other functions
are selected.
Lower control
box PCB.
D31 & D32 Diode. Feeds a signal to pin 8 on the
controller when the lower cylinder lift
function is selected at the upper
controls. It prevents backfeed to the
lower lift solenoid when the upper lift
cylinder solenoid is energised.
Upper
Control Box
P.C.B.
D33 & D34 Diode. Feeds a signal to pin 8 on the
controller when the upper cylinder lift
function is selected at the upper
controls. It prevents backfeed to the
upper lift solenoid when the lower lift
cylinder solenoid is energised.
Upper
Control Box
P.C.B.
D35, D36 Diode Feed a signal to pin 4 on the
controller when slew is energised
from the lower controls. They prevent
backfeed to the slew solenoids when
a signal is fed through D24 to pin 4
on the controller
Lower control
box PCB.
D37 Diode Feeds a signal from upper lift
cylinder (up ) solenoid to pin 4 on the
controller and prevents feedback to
the lift solenoid when other functions
are selected.
Lower control
box PCB.
FU1 Fuse 7Amps Overload protection for curcuit. On MCU
FU2 Fuse 160Amps Overload protection for Electric
motor.
On MCU
KSW1 Keyswitch 3-
position
Diverts power to either upper or
lower control boxes.
Lower control
box.
REFERENCE NAME FUNCTION LOCATION
LED 1 Outrigger
LED (Green)
This LED is illuminated when the
outriggers are deployed and taking
load. If an outrigger becomes “light”
and comes off the ground this LED will
go off and the alarm will sound.
Upper Control
Box.
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.
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