V. EMI (ELECTROMAGNETIC INTERFERENCE)
QM-710/715HD/ 720
6
2. Medium-Range Mobile Transceivers:
These include two-way radios used in police cars, fire trucks,
ambulances and taxi cabs. The antenna is usually mounted on the
outside of the vehicle.
3. Long-Range Transceivers:
These include commercial radio and TV broadcast antenna towers
and amateur (HAM) radios.
NOTE– The following are not likely to cause EMI problems: Lap-
top computers (without phone or fax), Cordless phones, TV sets
or AM/FM radios, CD or tape players.
D. DISTANCE FROM THE SOURCE
WARNING
Electro-magnetic energy rapidly becomes more intense as you get
closer to the source. For this reason, EMI from hand-held devices
is of special concern. (See Section C.1) A person using one of
these devices can bring high levels of EM energy very close to your
chair without you knowing it.
E. IMMUNITY LEVEL
WARNING
1.
The level of EM is measured in volts per meter (V/m). Every
power wheelchair can resist EMI up to a certain level. This is
called its “immunity level”.
2.
The higher the immunity level, the less the risk of EMI. It is
believed that a 20 V/m immunity level will protect the
power
wheelchair user from the more common sources of
radio
waves.
3.
The common configuration tested and found to be immune
to at least 20 V/m is: Quickie QM-710 power wheelchair
with a right-hand mounted RNET remote joystick system,
18" seat width, 18" seat depth, Omni
2
specialty control
module, power recline seat, cantilever armrests, power tilt,
ELR ALR powered legrests, attendant module, bluetooth
mousemover, I-device mousemover, output module, Gp 24
gel cell batteries.
4.
All After Market input device options, classified as breath
con-trols, Proportional controls, and/or Switched controls
that
can be used with this powerchair, have an unknown
effect on
their immunity level to different types of EMI. They
have not
been specifically tested with the
QM-710/715HD/720 and
RNET control system:
5.
All modifications required for the common configuration to
com-ply with ANSI/RESNA WC2/21 have been installed
WARNING
If there is any doubt that the specialty control input device is not
immune to 20V/m, extra care should be taken around known
sources of EMI.
WARNING
There is no way to know the effect on EMI if you add accessories
or modify this chair. Any change to your chair may increase the
risk of EMI. Parts not specifically tested or parts from other suppli-
ers have unknown EMI properties.
F. REPORT ALL SUSPECTED EMI
INCIDENTS
WARNING
You should promptly report any unintended movement or brake
release. Be sure to indicate whether there was a radio wave
source near your chair at the time. Contact:
Sunrise Medical, Customer Service Department at (800) 333-4000.
G. EMI FROM CHAIR
WARNING
The chair itself can disturb the performance of electromagnetic
fields such as emitted by alarm systems of shops.
H. HEAD ARRAY SAFETY AND RFI
WARNING
If you have a Head-array, the sensors used in the product have the
potential to operate unintentionally if moisture or any substance
that is electrically conductive is present in sufficient quantities.
Electro magnetic interference from electrical power lines and cer-
tain types of phones can cause the sensors to activate.
These sensors are capacitive in nature, and can generate an elec-
tronic field, which can be affected by liquids and/or a source of
radio frequency Interference (RFI). Any material that is conductive
has the potential to activate the Head-array unintentionally.
Avoid use under high power lines and around cell phones.
Avoid the use of a Head Array in rain or snow and protect against
the potential of spilled liquids on the sensors.
Avoid cell phones and electronic devices in proximity to the array.
Avoid any source that has the potential of (RFI).
Warn the user of this chair that the chair controls have the poten-
tial of acting erratically or making sudden stops, if (RFI) is not
avoided.
If any (RFI) causes erratic behavior, immediately cut off the power
to the wheelchair, and wait until the interference passes.
MK-100158 Rev. G
MK-100158 Rev G
