VR2 CONTROL SYSTEM
SK77898/2
PG DRIVES TECHNOLOGY
42
12 Electromagnetic Compatibility (E.M.C.)
The VR2 control system series has been tested for compliance with the EMC
requirements of EN12184. The guidelines in this section will help you to make sure
that your wheelchair installation will meet the requirements of the directive.
12.1 Emissions
A typical wheelchair and VR2 installation have been type tested and have passed
the requirements of CISPR 11.
Observe the following recommendations to minimize radio frequency emissions:
12.1.1 Motor Suppression
Solder a suitable suppression capacitor between the brush holders of each motor,
inside the motor cases. Keep the lead length as short as possible. We recommend
a value of 4n7F 250V AC ceramic. The maximum value you should use is 10nF. A
typical type is Roderstein WY0472MCMCF0K.
For 4 pole motors, a capacitor should be fitted between each pair of brushes.
12.1.2 Cables
You do not need to use screened battery and motor looms, but:
• Keep the length of all wiring to a minimum.
• Make sure the loop area of the wiring is minimized. Route the positive and
negative wires to each motor together.
• Route the battery positive and negative wires together. Where possible, route
the battery and motor looms together.
• Secure the motor and battery looms to the wheelchair frame over as much of
their length as is practical.
12.2 Immunity
The VR2 control system has been stringently tested for susceptibility to electromagnetic
radiation over the frequency range 26 MHz to 1 GHz. The test was conducted on a
typical wheelchair installation and passed the requirements of EN12184.
Follow the recommendations in section 13.1.2 to ensure maximum immunity to
electromagnetic radiation.
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