Hitachi SJ Series User Manual page 301

Chapter 12
12.11.8 Operate by Commanding Torque
Q
• We want to control as such a certain torque is
applied on the motor.
• We want to perform bump control.
• We want to set a certain torque when winding.
A
• In the case of using [AA121] control method in
sensorless vector control, sensorless vector control
in the zero speed area, and sensor vector control,
this drives the motor based on torque command.
• This function can be used not only in speed
control/pulse train position control but also in torque
control. It can also be applied to a winding machine.
• Using the torque bias function at the time of torque
control adds a torque bias amount to torque
command.
Torque command
+
Speed limit value
Speed detection
value
Parameter
Item
Speed/torque control
switch time
Torque control speed
limit value input
selection
Torque control
frequency limit value
(for normal rotation)
Torque control
frequency limit value
(for reverse rotation)
Torque bias
+
+
input
Speed
control
-
Speed
monitoring
Parameter Data
[Ad-04] 0~1000(ms)
[Ad-40] 01~13
[Ad-41] 0.00~590.00(Hz)
[Ad-42]
0.00~590.00(Hz)
12-11-14
!
• Because the speed under torque control is decided
by the balance with load, set [Ad-40] torque control
speed limit value input selection for prevention of
runaway. In the case of 07: Parameter setting, set
the speed limit value setting [Ad-41]/[Ad-42].
• In the case of operating by torque control, assign
067 [ATR] to any of the input terminals. Turning ON
the [ATR] terminal switches from speed control to
torque control.
• Torque command handles the input value selected
in the torque command setting [Ad-01] as a
command.
Torque limit
+
+
Speed control operates when the speed
detection value exceed the speed limit value.
Description
It is time to switch from torque command to speed
control. Set longer time when an error occurs at
the time of switching control.
01 (Ai1 terminal input)/02 (Ai2 terminal input)/ 03 (Ai3
terminal input)/04 (Ai4 terminal input: P1-AG)/ 05 (Ai5
terminal input: P1-AG)/ 06 (Ai6 terminal input: P1-AG)/
07 (Parameter setting)/08 (RS 485)/ 09 (Option 1)/10
(Option 2)/ 11 (Option 3)/12 (Pulse train input: main
unit)/ 13 (Pulse train input: P1-FB)
Sets frequency to limit in the normal rotation
during torque control.
Sets frequency to limit in the reverse rotation
during torque control.
Inverter Functions
Torque command
(Command value of
current control)