Drive Medical Sunfire Plus EC Owner's Manual download pdf (Page 8)

2 . S A F E T Y N O T I C E

This section provides the user with basic information that describes the problems with electromagnetic

interference (EMI), known sources of EMI, protective measure to either lessen the possibility or

exposure or to minimize the degree of exposure, and suggested action should unexpected or erratic

movement occur.

 Attention

It is very important that you read this information regarding the possible effects of

electromagnetic interference on your Sunfire Plus EC power wheelchair.

■ ELECTROMAGNETIC INTERFERENCE (EMI) FROM RADIO WAVE SOURCES

Powered wheelchair’s may be susceptible to electromagnetic interference (EMI), which is interfering

electromagnetic energy (EM) emitted from sources such as radio stations, TV stations, amateur radio

(HAM) transmitters, two-way radios, and cellular phones. The interference (from radio wave sources)

can cause the power wheelchair to release its brakes, move by itself, or move in unintended directions.

It can also permanently damage the powered wheelchair’s control system. The intensity of the

interfering EM energy can be measured in volts per meter (V/m). Each power wheelchair can resist

EMI up to a certain intensity; this is called its “immunity level”. The higher the immunity level, the

greater the protection. At this time, current technology is capable of achieving at least a 20 V/m

immunity level, which would provide useful protection from the more common sources of radiated

EMI. This power wheelchair model has as shipped as with no further modification an immunity level

of 20 V/m without any accessories.

There are a number of sources of relatively intense electromagnetic fields in the everyday environment.

Some of these sources are obvious and easy to avoid. Others are not apparent and exposure is

unavoidable. However, we believe that by following the warning listed below, your risk to EMI will

be minimized.

The sources of radiated EMI can be broadly classified into three types:

1. Hand-held portable transceivers ( transmitter-receivers with the antenna mounted directly on the

transmitting unit. Examples include: citizens band (CB) radios, “ walkie talkie”, security, fire, and

police transceivers, cellular telephones and other personal communication devices.

 Attention Some cellular telephones and similar transmit signal while they are ON, even when

not being used.

2. Medium-range mobile transceivers, such as those used in police cars, fire trucks, ambulances and

taxis. These usually have the antenna mounted on the outside of the power wheelchair.

3. Long-range transmitters and transceivers, such as commercial broadcast transmitters (radio and

TV broadcast antenna towers) and amateur (HAM) radios.

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Drive Medical Sunfire Plus EC Owner's Manual Page 8