PG DRIVES TECHNOLOGY I-DRIVE TECHNICAL MANUAL – INSTALLATION
5 Drive Motors
The controller is designed to be connected to a permanent magnet DC motor, fitted with a suitable gearbox and solenoid
brake.
In order to optimize the performance of the machine, the controller must be matched to the motor terminal impedance. This
matching is implemented by programming the controller. The parameter for adjustment is
Motor Compensation. Refer to
Chapter 3.
The Motor Compensation value should be set in accordance with the armature resistance of the motor and all cables and
connectors between the i-Drive and the motor. The value is set in milli-Ohms (mΩ). A recommended value is:
60% of the (armature resistance + cables and connectors)
Motor manufacturers should be able to supply figures for armature resistance and cable and connectors may typically be
40mΩ.
Example:
Motor has an armature resistance of 200mΩ
Cables and connectors are 40mΩ
Set Motor Compensation to 0.6 x (200 + 40) = 144mΩ
Failure to match the controller with the motors may result in poor control characteristics.
If you have any doubts about the suitability of a particular motor type or you need advice on measuring motor impedance,
contact PGDT.
The machine manufacturer is responsible for ensuring that the controller is matched to the motor
armature resistance. Failure to do this may result in poor control characteristics, which in
extreme instances can make a machine uncontrollable and potentially unsafe. PGDT accepts no
liability for losses of any kind arising from failure to comply with this condition.
The machine 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 machine 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 machine type to install it on a
different machine 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 machine. Failure to observe this warning could result in an
unsafe set-up for the machine user and may create a fire hazard depending on the motors, wiring,
connectors and circuit breakers installed on the unauthorized machine. 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
machine. By minimizing these effects, user comfort is improved and drive train reliability increased.
Roll-back occurs when the throttle is released while driving uphill, the machine 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 machine is
still moving.
The following programming is provided to allow these two conditions to be minimized.
SK76977-07 49
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