GBK60027 DX-SLM Installation Manual Issue 5
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General Description
The SLM is designed to enable the DX System to run on a servo steered power
wheelchair, with lights. The wheelchair will have: a servo motor, a position sense
potentiometer, a steering release microswitch, one or two drive motors with integral
park brakes, a 24 V battery supply, and optional 24 V lights.
The DX system will comprise of a minimum of a DX Remote, a DX Power Module, a
SLM and may also have up to 13 other DX modules.
The DX BUS is used to control and monitor all DX Modules. The DX Power Module has
two identical DX BUS connectors and is connected in a chain type arrangement with
the SLM. The SLM can be powered from an independent 24 V power supply, but low
power steering requirements can be powered from the DX BUS 24 V supply. The
lighting can also be supplied from the DX BUS, or from the 24 V wheelchair battery.
See section 5.4.3 and 5.4.4.
In a servo system, the speed and direction data from a DX Remote is passed to the
SLM rather than directly to the DX Power Module. The SLM processes the speed data
and then sends it directly to the DX Power Module. The direction signal is processed
by the SLM and applied to the servo steering motor. A position sense potentiometer
tells the SLM the steering position.
A microswitch is attached to the steering clutch so that when the clutch is released
for manual wheelchair manoeuvring, the system is inhibited and will not drive. When
the clutch is restored, the system must be turned off then on again to drive.
The DX System allows up to five preset Drive Programs to be selected, depending on
the type of remote. Each Drive Program contains an associated Steering Program
that defines the maximum steering lock available for safe driving at different speeds.
The SLM controls the steering lock to conform to the Steering Program, and also
controls the speed output, so that the speed cannot exceed that allowable for a
particular lock.
The SLM can control a full lighting system of sidelights (front and rear) and indicator
lights (left and right). The activation of the lights is via the DX Remote.
The SLM can be used with a two channel (70 or 90 A per channel) DX Power Module
(DX2-PMAxx) or a single channel 160 A DX Power Module (DX-PMB2-S). If only one
drive motor is used in the system then the DX-PMB2-S should be used.
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