Section 3 - Theory Of Operation; Overview; Modes Of Operation; Ground Mode - JLG TOUCAN 10E Service And Maintenance Manual

3.1 OVERVIEW

The MASTER MODULE (or master controller) mounted on
the right side of the chassis is the master system control-
ler. Most functions are dispatched and coordinated from
this module, all other system modules handle sub-tasks.
All characterized information (values) are stored into the
master module (i.e., Personalities, Machine Setups or Cal-
ibrations). If the master module is reprogrammed, this
information is lost.
Once set, all characterized information are copied to the
SLAVE MODULE (or slave controller) via the CAN bus.
The technician should record Personalities and Machine
Setups before programming so they can be restored after-
wards. Otherwise, default values can be used as a starting
point to restore previous configuration.
The PLATFORM MODULE reads linked switches and joy-
sticks positions and relays that information to the MAS-
TER and SLAVE MODULES. It uses information from the
CAN bus for operator display. It also reports faults pertain-
ing to devices in the Platform Control Station and devices
connected to the Platform Control Station.
The MASTER MODULE controls the main contactor, the
right drive motor and its brake and the hydraulic pump
motor via commands from the CAN bus. It also measures
current applied to these loads and input voltage for fault
protection and reporting.
The SLAVE MODULE controls the left drive motor and its
brake and all the hydraulic valves (lift up/down, swing,
steer and the proportional pressure relief valve) via com-
mands from the CAN bus. It also measures current
applied to these loads and input voltage for fault protec-
tion and reporting.
For safe operation of the vehicle, the control system will
not allow certain functions under certain conditions. These
are called interlocks. Specific interlocks are discussed
below. The interlocks discussed assume that all control
system devices are functioning properly unless indicated.
Fault conditions will generate DTC's and additional inter-
locks.
Some faults only show up at power-up when the control
system performs a self-test. All controls should be left
alone during this test.
Note that the market and model of the machine affects
what personalities and setups are. The appropriate infor-
mation is displayed for the given model and market. The
market and model must be set properly for safe and lawful
operation of the machine.

3.2 MODES OF OPERATION

Ground Mode

When the machine is powered up in Ground Mode, only
the functions at the Ground control station are opera-
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SECTION 3. THEORY OF OPERATION
– JLG Lift –

SECTION 3 - THEORY OF OPERATION

tional. Functions are controlled by membrane switches
(buttons). Whatever the function controlled, the Enable
button [ ] must be pushed-in and held to enable other
controls.

Platform Mode

In platform mode the Platform Control Box is enabled. It is
the primary control station for the vehicle. At power-up, all
indicators illuminate for a lamp check.

3.3 CAN COMMUNICATIONS

CAN (Controller Area Network) is the type of two-wire dif-
ferential serial communication link used between the plat-
form board, the Multi Display Indicator (MDI) and the
ground modules (master and slave controllers) for control
of the vehicle. This type of network has matured since its
invention in 1986 and is used extensively in many kinds of
machines.
Two-Wire Differential: The signal meaning is derived from
the difference in voltage between two wires, usually
twisted together in a common "jacket". This jacket can
also contain a shield surrounding the wires inside for
noise protection. Any noise that does penetrate the shield
will affect both wires the same. However, the difference in
voltage stays the same, therefore signal meaning is not
corrupted. This differs from one-wire signals in that one
wire signals derive the signal meaning from the difference
between the signal wire and system ground wire. The sys-
tem ground is the ground for many signals, as well as
power. Any noise on either wire will change the signal and
may corrupt it.
Serial Communication Link: Modules on the link send
messages digitally, bit by bit along the wires where differ-
ent voltage levels represent a "1" or a "0". The 1's and 0's
are assembled by the receiver according to the protocol
used to determine the messages meaning. Using serial
communication allows two wires to replace many more. It
also allows use of sensor and switch information in multi-
ple places without duplicating those sensors and
switches.
CAN: On a bus, all modules on the bus are connected to
the same wires. A CAN bus could be represented on a
schematic by a long pair of straight lines with multiple
modules connected to them by short pairs of lines. It has
a termination resistor at both ends of the long lines placed
between the two wires. These resistors are approximately
120 . On a JLG aerial work platform, this is typically in
the platform and in the chassis. These resistors may be in
the harness or in the module. A complete CAN circuit
measures approximately 60
these wires are open to the shield.
Each module on the CAN bus broadcasts its messages
according to a priority assigned to the message. All the
other modules will receive the message and determine if it
between the two wires and
3-1