Dynamic Controls DX-ACC2 User manual

Drive Stop Module
DX-ACC2
INSTALLATION MANUAL
Information in this document is subject to change without notice and does not
represent a commitment on the part of Dynamic Controls. No part of this manual
may be reproduced or transmitted in any form, or by any means, electronic or
mechanical, including photocopying or recording, for any purpose without the
written permission of Dynamic Controls.
Copyright 1998 by Dynamic Controls. All rights reserved.
Part Number GBK59698
(European reference No. GBK9998)
Version 2.0 March 2003
Dynamic and DX are trademarks of Dynamic Controls

DX Drive Stop Module, March 2003
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1 Introduction
The DX Drive Stop module is suitable for use in any DX system, and is used to
stop the wheelchair being driven without authorisation.
When the key is switched to the “Off” position the Drive Stop Module will
prevent the wheelchair from driving. If the key is switched to the “On” position,
the wheelchair functions normally.
Lighting and actuator functions, if fitted, operate as usual in either position.
Intended Use Statement
The DX-ACC2 is an accessory of the DX System intended to prevent
unauthorised driving of a powerchair.
2 Installation
The Drive Stop Module is to be installed in a system already comprising a DX
Power Module, and DX Master Remote.
The Drive Stop should be
securely fitted in a position that is
easily accessible to the chair user.
The selected position and
orientation should also give
maximum mechanical and
environmental protection. Avoid
positions in which the module or
its wiring can be knocked or
physically damaged or those
which are exposed to splashing
and/or other forms of abuse.
Dynamic Controls welcomes feedback from its customers on its products
and documentation. If you would like to comment on this manual or the
product it describes, please contact us at any of the addresses at the back on
this manual or by email at:
[email protected]
DX POWER MODULE
DRIVE STOP
MODULE
DX MASTER REMOTE

DX Drive Stop Module, March 2003
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With the DX system turned off, the Drive Stop
module can be connected to any of the other DX
modules being used in the system. This will
normally be either the DX Power Module or DX
Master Remote, but can be any other module with
an available DX BUS socket.
Warning: Do not use the frame of a wheelchair or scooter as the earth return for
any lights or actuators. Making any low resistance connection to the frame is
regarded as a possible safety hazard and not allowed by international performance
and safety standards for wheelchairs and scooters.
Ensure that all wiring is suitably restrained and of such a length that it is
physically impossible to connect the motor directly to the battery.
3 Safety
Users and Suppliers of Assistive Mobility products should give consideration to
the possibility of a failure to operate, or an incorrect operation, by the product.
Should an operator be left with limited or no mobility due to an equipment failure,
they should still be able to summon assistance from where ever they may be.
A warning must be conveyed to the operator that they have the responsibility to
ensure that the vehicle is kept in a good safe operating condition, and ensure that
components, such as cables, are protected from damage by securing them in
optimum positions.
All vehicle components should be regularly checked for loose, damaged or
corroded connectors, terminals, or cabling. All cables should be restrained to
protect them from damage. Damaged components should be replaced.
The user must turn the system off while getting in and out of the wheelchair.
If a wheelchair is programmed with settings other than default, under some very
rare fault conditions default settings could be automatically restored, thereby
changing driving characteristics. This in turn could lead to a chair moving in a
42mm
2
1mm
64mm
4
2mm

DX Drive Stop Module, March 2003
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direction or speed that is not intended. Programmers should consider this risk
when programming settings other than default.
4 Electromagnetic Compatibility (EMC)
Dynamic Electronic Controllers have been tested on typical vehicles to
confirm compliance with the following EMC standards:
Emissions: CISPR22, class B
Susceptibility: IEC1000-4-3
ESD: IEC1000-4-2
Compliance levels and set-up as per ISO 7176, part 21.
National and international directives require confirmation of compliance on
particular vehicles. Since EMC is dependant on the particular installation,
each variation must be tested. The guidelines in this section are written to
assist with meeting EMC requirements.
Minimising Emissions
Motors: Motor brushes generate electromagnetic emissions. It may
be necessary to fit capacitors between the brush holders and
the motor case. Ensure the leads are kept as short as
possible. A suitable capacitor is 4n7, 250V Ceramic.
Wiring: Keep wire lengths as short as practical for a tidy layout.
Minimise any wire loops, particularly loops of single wires
as opposed to wire return pairs.
Endeavour to run wires as send and return pairs.
Where practical, attach cables to wheelchair frame.
Immunity to Radiated Fields
Follow the wiring recommendations for minimising emissions.
Immunity to ESD
Follow the wiring recommendations for minimising emissions.
Ensure all vehicle sub-frames and modules are electrically connected.
Ensure any metal casing on speed setting potentiometers is electrically
connected to the vehicle frame.
Do not leave connection points unnecessarily exposed.

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5 International Standards
Dynamic Controls products built today allow our customers' vehicles to conform
to national and international requirements. In particular to:
ISO7176-9 - Climatic Tests for Electric Wheelchairs
ISO7176-14 - Power and Control Systems for Electric Wheelchairs
ISO7176-21 - Requirements and test Methods for Electromagnetic
Compatibility of Electric Powered Wheelchairs and
Scooters.
However the performance of controllers fitted to wheelchairs and scooters is very
dependent on the design of the scooter or wheelchair so final compliance must be
obtained by the vehicle manufacturer for their particular vehicle. No component
compliance certificate issued by Dynamic Controls relieves a wheelchair/scooter
manufacturer from compliance testing their particular vehicles.
User manuals should contain EMC warnings along the following lines:
Most electronic equipment is influenced by Radio Frequency
Interference (RFI). Caution should be exercised with regard to the use
of portable communications equipment in the area around such
equipment. While the manufacturer has made every effort to ensure
that RFI does not cause problems, very strong signals could still cause
a problem. If RFI causes erratic behaviour, shut the wheelchair off
immediately. Leave off while transmission is in progress.

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6 Miscellaneous
This manual must be read in conjunction with the installation manuals for all other
DX Modules to be used in your application. Heed all safety and misuse warnings
and if in doubt ask for advice.
For further information and assistance, including Sales and Servicing, contact
Dynamic.