Yaskawa Matrix Converter - Manual (Page 279)

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„ Adjusting the Torque Reference
Consider the following information when adjusting the torque.
Torque Reference Delay Time: d5-02
The time constant of the primary filter in the torque reference section can be adjusted. This parameter is used
to eliminate noise in the torque reference signal and adjust the responsiveness to the host controller. Increase
the setting if oscillation occurs during torque control.
Setting Torque Compensation
Set multi-function analog input A2 or A3 to torque compensation (setting 14). When the amount of torque loss
(such as mechanical loss, etc.) is input to one of these terminals, it is added to the torque reference to compen-
sate for the loss. The direction of torque will be as follows:
• Positive voltage (current): Torque compensation reference for forward motor rotation (counterclockwise as
viewed from the motor output shaft).
• Negative voltage: Torque compensation reference for reverse motor rotation (clockwise as viewed from
the motor output shaft).
Since the polarity of the voltage input determines the direction, only forward torque compensation can be
input when the 0 to 10 V or 4 to 20 mA signal level has been selected. To input reverse torque compensation,
select the 0 to ±10 V signal level.
„ Speed/Torque Control Switching Function
It is possible to switch between speed control and torque control when one of the multi-function inputs (H1-01
to H1-10) is set to 71 (Speed/Torque Control Change). Speed control is performed when the input is off and
torque control is performed when the input is on. Set d5-01 to switch speed/torque control.
„ Setting the Speed/Torque Control Switching Timer
The delay between a change in the speed/control switching function input (on to off or off to on) and the cor-
responding change in the control method can be set in d5-06. During the timer delay, the value of the 3 analog
inputs will retain the values they had when the on/off status of speed/torque control switching signal was
changed. Use this delay to complete any changes required in external signals.
Application Precautions
• The frequency reference (during speed control) is set in b1-01. The speed limit during torque control is set
in d5-03.
• If the torque reference has been assigned to a multi-function analog input, terminal A2, or terminal A3, the
input function changes when the control method is switched between torque control and speed control.
During speed control: The analog input terminal is used as the torque limit input.
During torque control: The analog input terminal is used as the torque reference input.
• When the Run Command turns off, the control method when stopped will be for speed control. Even from
the torque control method, the system will automatically change to speed control and decelerate to a stop
when the Run Command turns off.