Hitachi SJ Series, User Manual

Page: 294 / 786

12-11-7
Chapter 12 Inverter Functions
12.11.4 Operation under Limitation of
Torque
• We want to limit torque not to be excessive.
• We want to perform bump control.
• We want to use as a limit switch that it stops when
reached at the end of the system in torque control.
• We want to monitor the torque that the inverter
limits.
• This limits torque when the speed is controlled.
• In the case of using [AA121] control method,
sensorless vector control, sensorless vector control
in the zero speed area, and sensor vector control,
this limits output torque of the motor.
• The torque limit function is set in [bA110].
• When a torque limiting signal is selected in output
selection, the output terminal 022 [TRQ] torque
limiting signal will be turned ON once the torque
limit function above starts operation.
• If the torque liming function [TL] is set to an input
terminal, the torque limit function set to [bA110] will
be enabled, only when [TL] is turned ON. When it is
OFF, the torque limit setting will be disabled and the
torque limit value will be the maximum value.
• If the torque liming function [TL] is not set to an
input terminal, the torque limit function set to the
torque limit selection [bA110] will be enabled
constantly.
• The torque limit value [bA-11] in this function is
based on the inverter output current. Therefore,
output torque varies by the combination of motors.
Please be aware that these are not absolute figures
of torque.
1. Analog input mode
• It is a mode to set a torque limit value in all
operation states by applied voltage/current by
setting the Ai1/Ai2/Ai3 terminal on the control
terminal block in the torque limit selection [bA110].
• In the case of setting torque bias, values
corresponding to analog input are as follows.
Input to Ai1/Ai2 terminal
0 to 10 (V)/0 to 20 (mA)
corresponding value
Torque command addition 0.0 to
500.0(%)
Input to Ai3 terminal
-10 to 10 (V) corresponding value
Torque command addition -500.0 to
500.0(%)
• The setting of the ratio above can be changed by
adjusting the analog input start end function.
See "12.24.5 Adjust Analog Input".
(e.g.) In the case of setting 0.0 to 50.0% to the
torque command addition value for 0-10 (V)/0-20
(mA) input as [Ai1], set 10.0% for [Cb-04] to make it
50.0% against maximum 500.0%.
([Cb-03]=0.0,[Cb-04]=10.0,[Cb-05]=0.0,[Cb-06]=10
0.0)
2.4 Quadrant specific setting mode
• It is a mode to set respective torque limits 1 to 4
([bA112] to [bA115]) in the four quadrants of normal
powered, normal regenerative, reverse powered,
and reverse regenerative.
• It will be enabled when torque limit selection
[bA110] = 07 (parameter setting) and torque limit
mode selection [bA111] = 00 (by each quadrant).
• The relationship of four quadrants and torque limits
is shown in the figure below.
Q
A
!
Torque
Normal
Reverse
Powered
[bA112]
Regenerative
[bA115]
Powered
[bA114]
Regenerative
[bA113]