YASKAWA SVC - Page 106

3.4 Motion Parameter Details
3.4.2 Setting Parameter Details
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3
Parameters for Motion Control
 Latch Zone Setting Conditions
The latch zone is valid if the following conditions are met.
If the above conditions are not met, the latch zone is not valid regardless of the position.
• Latch Zone Lower Limit < Latch Zone Upper Limit
• Latch Zone Lower Limit > Latch Zone Upper Limit

Infinite-length Axes and Latch Zones
When bit 0 in fixed parameter No. 1 (Axis Selection) is set to 1 (Infinite-length axis), the latch
zone setting is specified in a 32-bit coordinate system.
Therefore, as shown in the following figure, a multi-turn area of the value that is specified for
fixed parameter No. 10 (Infinite-length Axis Reset Position (POSMAX)) can be set as the latch
zone.

Precautions for Setting Latch Zones
Latch zones are implemented in a software process in the SVC Function Module. However, the
actual latching is performed by the slave SERVOPACK. Therefore, depending on the transmis-
sion cycle, reference speed, and position deviation, the actual zone may vary from the set
zone. Set a latch zone that provides some leeway.
• Bit 4 in the OW09 setting parameter (Latch Zone Enable) is set to 1 (Enabled)
and,
• OL2A setting parameter (Latch Zone Lower Limit Setting) ≠ OL2C setting parameter (Latch
Zone Upper Limit Setting)
−
+
Latch zone lower limit
Latch zone upper limit
Latch zone
−
+
Latch zone lower limit Latch zone upper limit
Latch zone Latch zone
POSMAX
0
2
31
-1
-2
31
0
IL10 (CPOS)
IL12 (MPOS)
IL16 (APOS)
IL18 (LPOS)
IL0E (TPOS)
IL14 (DPOS)
Latch zone Latch Zone Upper
Limit Setting
Latch Zone Lower
Limit Setting