I-DRIVE TECHNICAL MANUAL – PROGRAMMING PG DRIVES TECHNOLOGY
The machine manufacturer is responsible for always ensuring that any replacement motors 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.
8.5.2 Slope Factor
This parameter can be used to fine tune the performance of the machine when stopping on a gradient. The parameter can be
adjusted in steps of 5 between 0 and 1275. When this parameter is set correctly, the machine should:
Have almost no roll-back while stopping on a gradient, driving up or down a slope.
Be almost completely stopped before the brake is applied.
The optimum value for this parameter can only be determined by test driving the machine. Refer to
Section 8.6 for details.
8.5.3 Anti-Rollback Level
This parameter should never require adjustment.
For further details contact PGDT.
8.6 Set-up Procedure
The i-Drive controller, when set-up correctly, can offer exceptional control of the machine on a gradient. It is possible to minimize
roll-back and in some cases, eliminate it completely. The degree to which this can be achieved depends on many machine
variables, such as weight, type of motor, backlash in transaxle etc.
Below is a procedure that if followed carefully should produce good results on nearly all machine types.
1. Set Compensation for the i45 & i70 to 100mΩ, Slope Factor to 150 and Brake Time to 1 second.
Set Compensation for the i140 & i180 to 25mΩ, Slope Factor to 500 and Brake Time to 1 second.
2. Set Forward Acceleration, Forward Deceleration, Reverse Acceleration and Reverse Deceleration to values that feel
good for the machine on a level surface. At this stage, don’t worry if there is a slight jolt when the machine comes to
rest.
3. With a cool motor, drive the machine very slowly up a 10° slope and gently release the throttle. Observe what
happens in the 1 second before the brake comes on.
• If the machine continues to drive forward, then the value of Compensation is too high and should be
reduced.
• If the machine rolls back down the slope, then the value of Compensation is too low and should be
increased.
When adjusting the value, make changes of 10mΩ each time and re-try. The target for this test is for the vehicle to
hold stationary for the 1 second until the brake is applied.
4. Take the machine back onto a level surface, drive forwards at full speed and release the throttle. Observe what
happens in the 1 second before the brake comes on.
• If the machine recoils (drives slightly in reverse) before the brake comes on, then the value of Slope Factor is
too low and should be increased.
• If the machine is still moving when the brake comes on, then the value of Slope Factor is too high and
should be decreased.
When making adjustments in the value, make changes of 10 each time.
Even if the machine feels good initially, it is recommended that Slope Factor be reduced until
slight recoil is felt, then the value increased again until the recoil just disappears.
SK76977-07 78
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