Handicare Raptor, Service Manual, Page: 70 / 163

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DRIVES TECHNOLOGY
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electronic system, may cause disruption of operation or even permanent damage.
The Egis controller incorporates extensive protection against E.S.D., however, you should
take the following precautions to prevent high levels of energy entering the controller.
The area where E.S.D. is most likely to enter the system is the tiller. Users who have
become “charged”, for example by walking on a nylon carpet, can impart a
significant discharge to the scooter via the first point they touch. The best method of
protection against such a discharge is to make all user controls and tiller enclosures
non-conductive. Switch manufacturers should be able to provide appropriate advice
and design rules.
Where controls and enclosures are conductive, a low impedance electrical connection
to the main mass of the scooter’s metalwork should be provided. If such a connection
is used, it should be kept as short as possible to minimize its electrical inductance.
If such a low impedance connection cannot be made because of electrical isolation
requirements then an alternative electrical connection should be provided via a
varistor. For 24V systems a suitable device is manufactured by Harris, type GE-MOV
V82ZA2. The varistor should be connected between the electrical terminal and battery
negative.
Charger socket, battery and motor terminals do not normally require protection.
If you need advice please contact PGDT.