Joysticks; Traction - JLG TOUCAN 10E Service And Maintenance Manual

3.4 JOYSTICKS

The joysticks are used to "command" lift, swing and drive.
Those commands may be modified by the control system
based on interlocks and personalities.
The joystick control handle sensors are not simple poten-
tiometers. There is a position sensing element, and signal
conditioning circuitry in them to generate the position sig-
nal. They are powered by 5VDC supplied from the plat-
form module. When centered a joystick will output
approximately 2.5VDC. Fully backward or left, it will output
approximately 0.5V DC. Fully forward or right, it will output
approximately 4.5V DC.
On the handle of the drive/swing joystick is the trigger
switch that must be depressed in order to operate those
functions. For the mast and jib joystick, an enable button
(located on the left hand side of the box) must be
depressed and held. This prevents unintentional move-
ment.
To pass start-up tests controls must be released and the
joysticks must be centered.
No operation from the platform console is possible until
the joysticks are centered. If one of the enable device is
found triggered at power-up, the emergency stop switch
must be re-cycled to clear the fault.
Joysticks personalities to define the centered position
(where command is 0%), minimum and maximum for-
ward, as well as minimum and maximum reverse can be
altered by performing a calibration of the joysticks.
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SECTION 3 - THEORY OF OPERATION

3.5 TRACTION

The traction or drive system, moves the vehicle along the
ground by electric asynchronous motors.
Each controller is an inverter which transforms the battery
DC voltage in AC voltage, to power the three phases drive
motors. The motors are wired in triangle configuration.
The rotating speed is directly linked to the voltage fre-
quency applied. The voltage supplied to the motor is
modulated below approx. 60 Hz; above 60 Hz, nominal
voltage is applied. The nominal voltage betweed two
motor phases is approx. 15 Vrms to 19 Vrms (will vary
depending on battery status and driving conditions). The
default frequency range is 0.6Hz to 170 Hz which approxi-
mately corresponds to a driving speed of 0km/h to 5.5km/
h. The actual rotating frequency of the motors is mea-
sured by the encoders; for a proper motor operation, the
difference between the actual frequency and the inverter
output frequency has to be maintained within few Hz.
When a motor
Freq.>Encoder Freq.; when the motor is braking, Inverter
Freq.<Encoder Freq.. The tolerance between the fre-
quency applied and the actual measurement called maxi-
mum slip value, is approx. 15Hz (depends on the speed
and on the driving conditions).
Figure 3-2. Drive Motor Schematic
– JLG Lift –
is driving the machine, Inverter
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