IMPULSE•VG+ Series 3 Instruction Manual – 07/25/05
5-49
2. When the speed/torque control selection is ON, torque control is activated.
• Speed limit during torque control is the master frequency reference at terminal A1, A2,
or A3 when speed limit selection (D5-03) is set to “1”, and is the speed limit value
(D5-04) when D5-03 = “2”, regardless of the frequency reference selection (B3-01)
setting.
• During torque control, the terminal A2 or A3 analog input value becomes the torque
reference.
3. By giving a stop command during torque control, operation changes to speed control
automatically, and the motor decelerates to stop. The torque limit during deceleration to stop
becomes the values set in the torque limit parameters (C7-01 to C7-04).
NOTE: The control mode actually changes after the speed/torque control selection command
changes and the reference delay timer (D5-06) elapses. The speed reference/speed limit
and the torque limit/torque reference are stored in the inverter until the time set to D5-06
elapses.
Droop Control
The Drooping function reduces the motor speed based on the load torque of the motor. The actual
amount of motor speed reduction is based on the ratio of the amount of motor torque and maximum
output frequency (E1-04).
The Droop Delay Time D6-02 sets the response time for the drooping function. Decreasing the
Droop Delay Time will cause the response to become quicker, however, instability may occur.
Parameter
Code Display Function Range Initial Value
Access
Level
D6-01 Droop Quantity Sets the motor speed
reduction when torque
output equals 100%
0.0 - 100.0% 0.0 Adv
D6-02 Droop Delay
Time
Sets the response time for
the drooping function
0.03 - 2.0 sec 0.05 Adv
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