AC Mobility
User Manual for the Traxx 2 2 electric wheelchair
September 2009
Page 8
General Warnings
Please take the time to carefully study all the following warnings. They are designed to help
you avoid an accident which may lead to injury to you or to others.
Warning #1 - Electromagnetic interference
What is electromagnetic interference (EMI) ?
Electromagnetic interference is the interference that may occur as a result of
electromagnetic energy emitted from radio wave sources. Such radio waves can adversely
affect the operation of electronic devices, such as the controller on your wheelchair.
Sources of electromagnetic interference
Sources that emit electromagnetic energy can be broadly classified into three groups:
Hand held portable transceivers
eg mobile phones, CB radios. These devices have the
antenna mounted on them.
Medium range mobile transceivers
eg radios and other communications equipment on
police, fire, ambulance and other emergency
vehicles. The antenna is normally mounted on the
outside of the vehicle.
Long range transmitters and
transceivers
eg commercial radio and TV stations, HAM radios,
microwave stations
The closer the chair is to the source of the EMI, the greater the potential impact of the EMI
on the operation of the chair.
The effect of electromagnetic interference on your wheelchair
It is important that you are aware of the potential dangers that may arise from EMI with
the operation of your chair. Such interference may appear as the unintended release of the
electric brakes on the chair and possibly movement of the chair by itself or movement of
the chair in unintended directions. EMI can also permanently damage the wheelchair
control system. The interference can occur without warning.
Any of these effects could result in severe injury to you or other people or cause other
property damage! Please remain vigilant for the possible effects of EMI and take care in the
operation of your chair.
Immunity to interference
Wheelchairs differ in their ability to resist EMI. An immunity level of 20 volts per metre or
more (a higher level is better) is desired for reasonable protection against the common
sources of EMI.
The Traxx 2 wheelchair fitted with either the Dynamic Controls DX controller system or the
Penny & Giles VSI controller system meets or exceeds an immunity level of 20 volts per
metre.
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