Invacare TDXSPBASE Service Manual page 20

SECTION 2—ELECTROMAGNETIC COMPATIBILITY (EMC) INFORMATION
Powered Wheelchair Electromagnetic Interference (EMI)
Because EM energy rapidly becomes more intense as one moves closer to the transmitting
antenna (source), the EM fields from hand-held radio wave sources (transceivers) are of special
concern. It is possible to unintentionally bring high levels of EM energy very close to the powered
wheelchair's control system while using these devices. This can affect powered wheelchair
movement and braking. Therefore, the warnings listed below are recommended to prevent
possible interference with the control system of the powered wheelchair.
Electromagnetic interference (EMI) from sources such as radio and TV stations, amateur radio
(HAM) transmitters, two-way radios, and cellular phones can affect powered wheelchairs and
motorized scooters. Also, the electronics used in our powered wheelchair can generate a low
level of electromagnetic interference, which however will remain within the tolerances
permitted by law.
FOLLOWING THE WARNINGS LISTED BELOW SHOULD REDUCE THE CHANCE OF
UNINTENDED BRAKE RELEASE OR POWERED WHEELCHAIR MOVEMENT WHICH
COULD RESULT IN SERIOUS INJURY.
1) Do not operate hand-held transceivers (transmitters receivers), such as citizens band (CB)
radios, or turn ON personal communication devices, such as cellular phones, while the
powered wheelchair is turned ON;
2) Be aware of nearby transmitters, such as radio or TV stations, and try to avoid coming close
to them;
3) If unintended movement or brake release occurs, turn the powered wheelchair OFF as soon
as it is safe;
4) Be aware that adding accessories or components, or modifying the powered wheelchair, may
make it more susceptible to EMI (NOTE: There is no easy way to evaluate their effect on the
overall immunity of the powered wheelchair); and
5) Report all incidents of unintended movement or brake release to the powered wheelchair
manufacturer, and note whether there is a source of EMI nearby.
Important Information
1) 20 volts per metre (V/m) is a generally achievable and useful immunity level against EMI (as of
May 1994) (the higher the level, the greater the protection);
2) This device has been tested to a radiated immunity level of 20 volts per meter.
3) The immunity level of the product is unknown.
Modification of any kind to the electronics of this wheelchair as manufactured by Invacare may
adversely affect the EMI immunity levels.
Risk of Injury or Damage
EMC interference affecting other products may result in injury or damage.
To avoid impacting the operation and function of other products:
- Products not specified by Invacare that may be used on or near the wheelchair may be
impacted by emissions from this product if they have a sensitivity level that is lower than the
recognized standard and provided by this wheelchair. Refer to the manufacturer specifications
for any electronic device BEFORE use near this product to determine its level of immunity and
potential risk.
TDX® SP
WARNING
CAUTION
20
Part No 1143209