9.4.2 Main ITC components
The most important components of the Intelligent Torque Control system developed by
SME are the following:
●
The control unit, which is made of a panel assembly containing the power inverter
and a control board; main board, wired directly to the power modules and can
manage up to 4 inverters. The presence of the DSP (Digital Signal Processors)
guarantees powerful software performance and high dynamic performance in
vectorial torque control.
●
An asynchronous three-phase drive motor equipped with a speed sensor (64
impulses/rotation)
●
The compact display.
The software control algorithm can be customized and a wide range of parameters can be
set to optimize system performance and to adjust the settings of the main functions
according to the user’s needs.
The user can interact with the control board by making use of a software application
(named EyePlus) developed by SME, or through the COMPACT display, a complete
console capable of diagnostic and calibration functions engineered by SME. In both cases,
you can obtain an exhaustive “on line” diagnostic of all the lift truck functional parameters
and adjust them too.
The control board can be upgraded by connecting a PC through the serial port (or through
the USB 1.x or higher by inserting the appropriate UART-USB adapter); indeed the
EyePlus application permits you to load and upgrade the firmware of the control panel in
any working conditions.
9.4.3 Basic ITC functions
The following basic hardware and software functions characterize The SME system:
●
Protection against reverse battery polarity
●
Anti-roll-back, with adjustable ramp stop time
●
Anti-roll-down
●
Regenerative braking
●
Electrically assisted braking
●
Management of static return to off function (SRO)
●
Speed compensation (load/unload)
●
Speed acceleration/deceleration
●
Speed reduction
●
Redundant control of acceleration pedal (applying a control switch or a double
potentiometer)
●
Continuous lift speed control
●
Continuous control of main contactor applied to DC power line
●
Seat switch open check with delay time
●
Battery discharged indicator with adjustable reset value
PRELIMINARY VERSION 56
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