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manual abstract
3. The types of hazards you must overcome in daily use (in areas where you are likely to use your chair/scooter). 4. The need for options for your safety and comfort (such as positioning belts or special seat systems). B. ADJUST CHAIR/SCOOTER TO YOUR ABILITY You need to work with your doctor, nurse or therapist, and your supplier, to fit this chair/scooter and adjust the controller settings for your level of function and ability. C. REVIEW THIS MANUAL OFTEN Before using this chair/scooter you, and each person who may assist you, should read this entire Manual and make sure to follow all instructions. Review the warnings often, until they are second nature to you. D. WARNINGS The word “WARNING” refers to a hazard or unsafe practice that may cause severe injury or death to you or to other persons. The “Warnings” are in four main sections, as follows: 1. V — EMI Here you will learn about electromagnetic interference and how it can affect your chair/scooter. 2. VI — GENERAL WARNINGS Here you will find a safety checklist and a summary of risks you need to be aware of before you ride this chair/scooter. 3. VII — WARNINGS — COMPONENTS & OPTIONS Here you will learn about your chair/scooter. Consult your supplier and your health care professional to help you choose the best set-up and options for your safety. 4. XI — BATTERIES Here you will learn about battery and charger safety, and how to avoid injury. NOTE– Where they apply, you will also find “Warnings” in other sections of this Manual. 930705 Rev. B V. EMI (Electromagnetic Interference) 7English V. EMI (Electromagnetic Interference) 7English V. EMI (ELECTROMAGNETIC INTERFERENCE) Heed all warnings to reduce the risk of unintended brake release or chair/scooter movement: 1. Beware of the danger from hand-held transceivers. Never turn on or use a hand-held transceiver while power to your chair/scooter is on. Use extra care if you believe that such a device may be in use near your chair/scooter. 2. Be aware of nearby radio or TV stations, and avoid coming close to them. 3. If unintended movement occurs, turn your chair/scooter off as soon as it is safe to do so. A. WHAT IS EMI? 1. EMI means: electromagnetic (EM) interference (I). EMI comes from radio wave sources such as radio transmitters and transceivers. (A “transceiver” is a device that both sends and receives radio wave signals). 2. There are a number of sources of intense EMI in your daily environment. Some of these are obvious and easy to avoid. Others are not, and you may not be able to avoid them. 3. Powered wheelchair/scooters may be susceptible to electromagnetic interference (EMI) emitted from sources such as radio stations, TV stations, amateur radio (HAM) transmitters, two way radios, and cellular phones. 4. EMI can also be produced by conducted sources or electro-static discharge (ESD). B. WHAT EFFECT CAN EMI HAVE? 1. EMI can cause your chair/scooter, without warning, to: • Release its brakes • Move by itself • Move in unintended directions If any of these occurs, it could result in severe injury to you or others. 2. EMI can damage the control system of your chair/scooter. This could create a safety hazard, and lead to costly repairs. C. SOURCES OF EMI The sources of EMI fall into three broad types: 1. Hand-Held Transceivers: The antenna is usually mounted directly on the unit. These include: • Citizens band (CB) radios • “Walkie-talkies” • Security, fire and police radios • Cellular phones • Lap-top computers with phone or fax • Other personal communication devices NOTE– These devices can transmit signals while they are on, even if not in use. 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. 930705 Rev. B 8 English V. EMI (Electromagnetic Interference) V. EMI (Electromagnetic Interference) D. DISTANCE FROM THE SOURCE EM 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 C.1) A person using one of these devices can bring high levels of EM energy very close to your chair/scooter without you knowing it. E. IMMUNITY LEVEL 1. The level of EM energy is measured in volts per meter (V/m). Every power wheelchair/ scooter 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/scooter user from the more common sources of radio waves. 3. The configurations tested and found to be immune to at least 20 V/m are: a. Guardian Ruby power wheelchair with a right-ha...