AC TRACTION – ADJUSTMENTS PG DRIVES TECHNOLOGY
1.36 Dual Motor Cutback – (DMcut)
1.37 Dual Motor Angle 1 – (DMang1)
1.38 Dual Motor Angle 2 – (DMang2)
1.39 Dual Motor Angle 3 – (Dmang3)
1.40 Dual Motor Speed 1 – (DMspd1)
1.41 Dual Motor Speed 2 – (DMspd2)
1.42 Dual Motor Speed 3 – (DMspd3)
For these functions to be active, the parameter, 3.2 Control Mode, must be set to 1 (Torque) and 3.15 Single / Dual Motor Select,
must be set to 1 or 2.
The values for parameters 1.36 to 1.39 are expressed as percentages, where:
100% = a voltage corresponding to the parameter, 1.27 Steer Pot. Max. (normally full right hand lock).
-100% = a voltage corresponding to the parameter, 1.25 Steer Pot. Min. (normally full left hand lock).
0% = a voltage corresponding to the parameter, 1.26 Steer Pot. Mid. (no steer).
Dual Motor Cutback sets the point at which the inner motor starts to reduce speed in response to the position of the steering
potentiometer. For example, if a value of 10% is chosen, then the speed reduction will commence if the steering potentiometer
is outside of a central deadband of +/- 10%.
In the central deadband, the inner motor speed is equal to the outer motor speed and corresponds to the driving speed of the
vehicle.
The relationship between parameters 1.36 to 1.42 is explained below for both the inner and outer motors.
Inner motor – When the steering pot is beyond the 1.36 Dual Motor Cutback setting towards the 1.37 Dual Motor Angle 1 setting,
the motor starts to reduce speed towards the 1.40 Dual Motor Speed 1 setting, while it also reduces the torque towards zero.
When the steering pot is between 1.37 Dual Motor Angle 1 and 1.38 Dual Motor Angle 2, the torque of the inner motor is zero,
meaning it is able to freewheel.
Steering beyond the 1.38 Dual Motor Angle 2 towards the 1.39 Dual Motor Angle 3, causes the inner motor to reverse it’s
direction, torque is increased towards half the demanded torque and the speed of the inner motor starts at 1.41 Dual Motor
Speed 2 and is increased towards half the value of the 1.42 Dual Motor Speed 3 setting.
When steering beyond the 1.39 Dual Motor Angle 3 setting towards 100% full steering, the torque of the inner motor is maintained
at half the demanded torque and the speed is set to half the value of the 1.42 Dual Motor Speed 3 setting.
Outer motor – When the steering pot is beyond the 1.36 Dual Motor Cutback setting and towards the 1.38 Dual Motor Angle 2
setting, the speed of the outer motor is reduced towards the 1.42 Dual Motor Speed 3 setting.
When steering between 1.38 Dual Motor Angle 2 and 1.39 Dual Motor Angle 3, the speed of the outer motor is reduced from the
1.42 Dual Motor Speed 3 setting towards half of the 1.42 Dual Motor Speed 3 setting.
Steering beyond the 1.39 Dual Motor Angle 3 setting maintains the speed of the outer motor at half the 1.42 Dual Motor Speed 3
setting.
The torque of the outer motor is maintained at the demanded torque.
The reason why both inner and outer motors are maintaining a speed half that of the 1.42 Dual Motor Speed 3 setting is because
the outer motor runs in one direction while the inner motor runs in the opposite direction. This produces a total speed twice that of
one motor. Therefore, the total speed beyond 1.39 Dual Motor Angle 3 is exactly the 1.42 Dual Motor Speed 3 setting.
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