TL33 Work Platform 6-3c
Sectio
n
6.1 Electrical Schematic SERIAL NUMBERS: 1331 TO CURRENT
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 To elimninate any power spikes which
may affect relay 1
On lower control
box PCB.
D3 Diode To elimninate any power spikes which
may affect relay 2
On lower control
box PCB.
D4 Diode Feeds +24V to pin 6 on the controller
when the keyswitch is switched to lower
controls.
Lower control
box PCB.
D5 TO D10 Diode Suppression diodes for coils of hydraulic
solenoids.
Lower control
box PCB.
D11,D12 Diode prevents feedback to alarm ALM1 whens
relays k1 and k2 are energised
Lower control
box PCB.
D13 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.
D14 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.
D15 Diode Feeds power to slew left solenoid from
upper controls and prevents feedback to
upper controls from the lower controls
Lower control
box PCB.
D16 Diode Feeds power to slew left solenoid from
lower controls and prevents feedback to
lower controls from the upper controls
Lower control
box PCB.
D17 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.
D18 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.
D19 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.
D20 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.
D21 Diode Feeds power to slew right solenoid from
upper controls and prevents feedback to
upper controls from the lower controls
Lower control
box PCB.
D22 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
D23 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.
D24 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.
D25 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.
D26 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.
D27 Diode Feeds power signal from joystick trigger to
pin 4 on controller when emergency
override is activated
Lower control
box PCB.
D28,D29 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.
D30 Diode Prevents backfeed to pin 4 on the controller
when the a signal is sent to the line
contactor from the jostick trigger.
Lower control
box PCB.
D31 Diode Prevents backfeed to lower control contact
of the keyswitch when the line contactor is
energised.
Lower control
box PCB.
D32 Diode It prevents backfeed to the lower control
switches when the alarm is activated from
upper controls.
Lower control
box PCB.
D33 Diode Feeds a signal to the line contactor when
the joystick trigger is depressed. It
prevents backfeed to the upper controls
when the line contactor is energised by the
lower controls.
Lower control
box PCB.
D34 Diode Allows the feed to the alarm for continuous
operation in tilt. Prevents the continuous
alarm during intermittent outrigger
operation
Lower control
box PCB.
D35 Diode Feeds the tilt alarm switch when the key
switch is set to lower controls and prevents
feedback when the keyswitch is set to
upper controls.
Lower control
box PCB.
D36 Diode Feeds the tilt alarm switch when the key
switch is set to upper controls and
prevents feedback when the keyswitch is
set to lower controls.
Lower control
box PCB.
D37 Diode Suppression diode for the coil of direction
relay 1 (RL1)
Upper Control
Box P.C.B.
D38 Diode Suppression diode for the coil of direction
relay 2 (RL2)
Upper Control
Box P.C.B.
D39 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.
D40 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.
REFERENCE NAME FUNCTION LOCATION
D41 & D42 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.
D43 & D44 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.
D45 Diode Suppression diode for coil of line
contactor.
LC1
D46, D47 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 D27 to pin 4 on the controller
Lower control box
PCB.
D48 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
FU3 Fuse 7Amps Overload protection for supply to motor
control unit.
On MCU
K1 Alarm Relay. This relay is energised when the four
outrigger limit switches are activated
the normally closed contacts which feed
power to the alarm are opened and the
alarm switches off. If an outrigger limit
switch opens during operation of the
booms the relay de-energises and the
alarm sounds.
On lower control
box PCB.
K2 Relay. This Relay is constantly energised
through the tilt alarm. The normally
open contacts remain closed in this
state and feed the upper controls with
power when the keyswitch is turned to
the upper controls.
On lower control
box PCB.
KSW1 Keyswitch 3-
position
Diverts power to either upper or lower
control boxes.
Lower control
box.
LC1 Line
Contactor.
In the unergised state the normally
closed contacts allow the charger +ve to
the batteries.
In the energised state the normally
open contacts contacts close and route
the battery +ve to the pump motor.
On the motor
control unit on the
chasis subframe.
LED 1 Battery
Indicator.
(Red)
The LED remains off when the batteries
are fully charged. The LED flashes when
the batteries begin to discharge. The
LED will remain on when the batteries
are fully discharged.
Upper Control
Box.
LED2 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.
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