E&J GF0600059REVB06 manual Electromagnetic interference EMI from radio wave sources

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Electromagnetic interference (EMI) from radio wave sources

It is very important that you read this information regarding the possible effects of electromagnetic interference on your Everest & Jennings Metro Power III power wheelchair.

Powered wheelchairs may be susceptible to electromagnetic interference (EMI), which is interfering electromagnetic (EM) energy emitted from sources such as radio stations, TV stations, amateur radio (HAM) transmitters, two-way radios, and cellular telephones. The interference (from radio wave sources) can cause the powered wheelchair to release its brakes, move by itself, or move in unintend- ed 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 powered 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 radi- ated EMI.

This powered wheelchair model has an immunity level of 20 V/m when tested with Integral Control- ler Part Number 90762330.

Be aware that using different components, adding accessories, or modifying the powered wheelchair may change the immunity level.

There are a number of sources of relatively intense electromagnetic fields in the everyday environ- ment. 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 warnings that follow, your risk to EMI exposure will be minimized.

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

1)Hand-held portable transceivers (transmitters-receivers) with the antenna mounted directly on the transmitting unit. Examples include: citizens band (CB) radios, “walkie talkies”, security, fire, and police transceivers, cellular telephones, and other personal communication devices.

Note: Some cellular telephones and similar devices transmit signals 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 vehicle; and

3)Long-range transmitters and transceivers, such as commercial broadcast transmitters (radio and TV broadcast antenna towers) and amateur (HAM) radios.

Note: Other types of hand-held devices, such as cordless telephones, laptop computers, AM/FM radios, TV sets, CD players, and cassette players, and small appliances, such as electric shavers and hair dryers, so far as we know, are not likely to cause EMI problems with your powered wheel- chair.

 

 

 

Metro Power III Owner’s Manual

GF0600059RevB06, November 2006



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Contents Metro Power Contents Introduction Maintenance II Safety PrecautionsGF0600059RevB06, November GF0600059RevB06, November Electromagnetic interference EMI from radio wave sources EMI Warnings Powered Wheelchair Electromagnetic Interference EMIImportant Information Balance III Handling TipsReaching / bending backward Reaching / bending forward or sidewardRamps and Inclines Descent AscentIV Getting Started Joystick Power Drive SystemMotor and battery cables Integral controllerHorn button ON/OFF switchBattery gauge Maximum speed / profile indicatorBatteries Operating InstructionsArms Flip arm back VI AdjustmentsFootrest-detachable, swingaway Remove footrest Adjust footrest lengthAttach footrest Attach elevating legrest Adjust legrest elevationAdjust elevating legrest pad position up or down Adjust elevating legrest footplate extension lengthAdjust wheel locks VII Batteries Guidelines to extending battery lifeBattery Charger Interface Battery charger back panel Battery Charger Battery Charger FeaturesBattery charger front panel AC voltage switchLine connector AC connectorBattery Charger Safety Charging the Batteries Remove and Install Batteries Remove Batteries Metro Power Battery connections Install BatteriesClean battery terminals Battery maintenance Clean batteriesDo-it-yourself Maintenance Viii MaintenanceControl system daily check Joystick Controller Maintenance GeneralList of Tools Charge batteriesMounting ConnectorsJoystick boot CablesCheck wheel lock engagement Clean & check upholsteryClean wheelchair Check tiresCheck bearings Inspect motor brushesGeneral diagnostic guide IX TroubleshootingTroubleshooting, Power Drive Troubleshooting, integral controllerBattery gauge diagnostic guide table Battery gauge diagnostic guideBattery System Gauge Check / Action Lights Front output fuse panel Troubleshooting, battery chargerSYMPTOMCHECK-ACTION Reassembly Transporting the Metro PowerWarranty Periods XI Limited WarrantyGF0600059RevB06, November XII Index GF0600059RevB06, November

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