PG DRIVES TECHNOLOGY S-DRIVE – TILLER MODULE
SK76745/10
6 Electromagnetic Compatibility (EMC)
The controller has been tested for compliance with EC directive 89/336/EEC, and the EMC requirements of prEN12184, the FDA
and the FCC. The guidelines in this section will help you to make sure that your scooter installation will easily meet the
requirements of the directive. You should consider EMC and perform relevant tests as early as possible in the design phase.
6.1 Immunity and Emissions
Refer to the Electromagnetic Compatibility section in the controller’s technical manual.
6.2 Electro-Static Discharge (E.S.D.)
The tiller is the most vulnerable area on the scooter to electro-static discharges. These discharges may cause disruption of
operation or even permanent damage. The tiller module incorporates extensive protection against E.S.D., however, you should
take the following precautions to prevent high levels of energy entering the scooter’s electronic system.
The highest degree of protection can be achieved by making the tiller enclosure, switches and other controls
non-conductive. Membrane keypads in particular provide good E.S.D. protection, keypad manufacturers will be
able to give appropriate design rule guidance. It should also be considered that high voltages can jump through
gaps in enclosures, thereby gaining access to the electronics. Enclosures should therefore be as closed as
possible.
If controls or enclosures are conductive, a low impedance electrical connection to 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.
The tiller module has a connection point, ESD: this can be used to provide an ESD drain path. The path should be
via a varistor connected between the ESD pin and the scooter’s metalwork. A suitable device is manufactured by
Harris, type GE-MOV V82ZA2.
7 Production Tests
7.1 Mounting
Make sure that the tiller module is securely mounted. Do not overtighten any securing screws.
Ensure that the adhesive sealing overlay is fully pressed down.
7.2 Cables and Connections
Check all cables and connections to the tiller module for damage. Ensure there are no dry solder joints.
7.3 Operational Test
The following tests should be carried out on a level floor with at least one meter of clear space around the scooter.
With the scooter switched off, displace the throttle and then switch the scooter on. The TruCharge display should “ripple” up and
down. When you have observed that all the bars illuminate, release the throttle and the display should now become steady and
indicate the battery condition.
There are two conditions when this test cannot be performed. Firstly, if the controller is programmed (Throttle Displaced at Power-
up) to instantly trip if it is powered-up with the throttle displaced. Secondly, if the controller is programmed (High Pedal Disable) to
drive immediately after power-up regardless of throttle position.
If this test cannot be performed due to the above conditions, then the only other test method is to power-up the scooter with fully
charged batteries and check that all the TruCharge bars illuminate.
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