Omron VARISPEED G7 Instruction Manual page 316

Negative voltage: Torque compensation reference for reverse motor rotation (clockwise as viewed from
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the motor output axis).
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. If you want to input reverse torque com-
pensation, be sure to 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
corresponding change in the control mode can be set in d5-06. During the timer delay, the value of the 3 ana-
log 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
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in d5-03.
If the torque reference has been assigned to a multi-function analog input, terminal A2, or terminal A3, the
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input function changes when the control mode 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
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the torque control mode, the system will automatically change to speed control and decelerate to a stop
when the run command turns OFF.
When A1-02 (control method selection) is set to 3 (flux vector control), the speed/torque change command
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(a setting of 71) can be set for a multi-function input (H1-01 to H1-10) to switch between speed and torque
control during operation. An example is shown below.
Terminal No. User Constant No.
8
A1
A3
Factory Setting
H1-06 8
b1-01 1
C5-03 1
H3-05 0
Individual Functions
Setting Function
71 Speed/torque control change
Frequency reference selection
1
(terminals A1, A2)
1 Speed limit (terminals A1, A2)
13 Torque reference/torque limit
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