Driving With Torque Bias - Hitachi WJ Series User Manual

Chapter 9
9.6.4

Driving with Torque Bias

 How to temporarily add torque when using torque control to operate an extrusion machine,
Q
winding machine, or similar equipment?
 The torque bias function adds a bias value to torque commands when using torque control for
A
motor operation with the " Permission of torque control [ATR] (52)" terminal ON.
 The torque bias value can switch the direction in which torque is added by switching the
forward rotation/reverse rotation direction of the RUN command with the "Torque bias polarity
selection [P038]" setting.
- If [P038] is "According to sign (00)":
Torque is increased in the direction of forward rotation when the torque bias value is (+),
and increased in the direction of reverse rotation when the torque bias value is (-),
regardless of the direction of operation.
- If [P038] is " Depending on the operation direction (01)":
The torque bias value is added with the direction of the RUN command as (+).
If the RUN command is forward rotation:
If the RUN command is reverse rotation:
 For the set torque value, the torque equivalent to the inverter's rated output current is used as
!
the reference value (100%). Therefore, note that the absolute torque value will vary depending
on the motor combination in use.
Code
[d010] Torque bias monitor
Torque bias input
[P036]
source selection
[P037] Torque bias value
Torque bias polarity
[P038]
selection
When the torque bias value is (+), the forward rotation torque increases.
When the torque bias value is (-), the reverse rotation torque increases.
When torque bias value is (+), the reverse rotation torque increases.
When the torque bias value is (-), the forward rotation torque increases.
Item
Monitors the current torque bias value.
None
Parameter setting
Option
Sets the torque bias value when [P036] is set to
"Parameter setting (01)".
According to sign:
Add a torque bias in the direction of forward
rotation when the torque bias value is (+),
and in the direction of reverse rotation when
the torque bias value is (-).
Depending on the operation direction:
The torque bias value is added with the
direction of the RUN command as (+).
9-6-6
Inverter Functions
Description Data
-200 to +200 (%)
00
01
05
-200 to +200 (%)
00
01