S-DRIVE - INSTALLATION PG DRIVES TECHNOLOGY
SK76745/10
If you have any doubts about the suitability of a particular motor type or you need advice on measuring motor impedance,
contact PGDT.
The scooter manufacturer is responsible for ensuring that the controller is matched to the motor
resistance. Failure to do this may result in poor control characteristics, which in extreme
instances can make a scooter uncontrollable and potentially unsafe. PGDT accepts no liability for
losses of any kind arising from failure to comply with this condition
.
The scooter manufacturer is responsible for always ensuring that any replacement motors or
gearboxes are fully compatible with the originals that the controller was designed to match.
Failure to do this may result in poor control characteristics, which in extreme instances can make
a scooter uncontrollable and potentially unsafe. PGDT accepts no liability for losses of any kind
arising from failure to comply with this condition.
Users or service personnel must not move a controller from one scooter type to install it on a
different scooter type. Controllers with different part numbers may have both hardware and
software differences to ensure that they are compatible with the electrical and dynamic
characteristics of their specific target vehicles. The characteristics of one type of controller may
not be compatible with a different scooter. Failure to observe this warning could result in an
unsafe setup for the scooter user and may create a fire hazard depending on the motors, wiring,
connectors and circuit breakers installed on the unauthorized scooter. PGDT accepts no liability
for losses of any kind arising from failure to comply with this condition.
5.1 Gradient Performance
To achieve the most comfortable performance on a gradient, it is desirable to minimize the roll-back and roll-forward of the
scooter. By minimizing these effects, user comfort is improved and drive train reliability increased.
Roll-back occurs when the throttle is released while driving up hill. The scooter will stop and then may roll-back slightly before the
brake is applied.
Roll-forward occurs when the throttle is released while driving downhill and results in the brake being applied while the scooter is
still moving.
The following programming is provided to allow these two conditions to be minimized.
Motor Compensation, Enhanced Motor Compensation Up, Enhanced Motor Compensation Down and Enhanced Motor
Compensation Up Gain. Refer to Chapter 3.
5.2 Freewheeling
There are two typical methods for providing a scooter freewheel function.
Disengaging the motor and brake assembly from the remainder of the drive train and allowing the wheels to freely
rotate.
Disengaging the solenoid brake from the motor and allowing the wheels and motor to rotate.
If the latter method is used, the S-Drive can detect the motor rotating above a certain speed and then brake it automatically,
thus removing the possibility of the scooter freewheeling at an excessive speed. This function will operate if the scooter is switched
off and even if there are no batteries fitted or connected.
It is the responsibility of the scooter manufacturer to ensure that adequate precautions are taken to warn the
user against the hazards of freewheeling the scooter at excessive speeds. It is also the responsibility of the
scooter manufacturer to utilize a suitable freewheel mechanism to reduce these risks. PGDT accepts no
liability for losses of any kind resulting from excessive freewheel speeds of a scooter.
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