Hitachi SJ Series, User Manual

Page: 301 / 786

12-11-14
Chapter 12 Inverter Functions
12.11.8 Operate by Commanding Torque
• 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.
• 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.
Parameter
• 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.
Item Parameter Data Description
Speed/torque control
switch time
[Ad-04] 0~1000(ms)
It is time to switch from torque command to speed
control. Set longer time when an error occurs at
the time of switching control.
Torque control speed
limit value input
selection
[Ad-40] 01~13
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)
Torque control
frequency limit value
(for normal rotation)
[Ad-41] 0.00~590.00(Hz)
Sets frequency to limit in the normal rotation
during torque control.
Torque control
frequency limit value
(for reverse rotation)
[Ad-42]
0.00~590.00(Hz)
Sets frequency to limit in the reverse rotation
during torque control.
Q
A
!
Speed
control
Torque command
(Command value of
current control)
Speed control operates when the speed
detection value exceed the speed limit value.
Torque bias Torque limit
Torque command
input
Speed limit value
Speed detection
value
Speed
monitoring
+
-
+
+
+
+