Hitachi SJ Series, User Manual

Page: 387 / 786

12-17-26
Chapter 12 Inverter Functions
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Shortest Position Control
• When the [AE-56] positioning mode selection is set
to 01 (without limit), the rotation direction is
determined so that the moving distance to a target
position is the shortest for applications such as a
turntable.
Application example) A turntable with eight
positioning points
• Assume a case of moving from the current position
(1000 pulse) to the target position (6000 pulse).
• When [AE-56] = 00 (with limit), Since (target
position) - (current position) = +5000 pulse, the
rotation is in the forward direction.
• When [AE-56] = 01 (without limit), the move is in
the reverse direction with the shorter moving
distance comparing the forward and reverse
directions.
Moving distance in the forward direction: +5000
pulse
Moving distance in the reverse direction: -3000
pulse
• For the above example, Set the [AE-52] forward
rotation side position range designation = 7999 and
[AE-54] reverse rotation side position rang
designation = 0.
Also, each positioning point is required to be set in
this range.
• Depending on the setting for the position range
designation, the following settings are also allowed.
[AE-52]=3999
[AE-53]=-4000
• When [AE-56] = 01, the [E104] position control
range error does not occur.
• In the following left case, when moving the position
of 7000 pulse to that of 1000 pulse, the forward
rotation side position range (7999) is exceeded,
however, the current position counter gets back to
0.
Current
position
2000
4000
6000
3000
1000
7000
5000
Target
position
For AE-56 = 01
0
For AE-56 = 00
!
Current
position
-2000
0
2000
-1000
-3000
3000
1000
Target
position
－
4000
For AE-56 = 01
For AE-56 = 00