51
6
EXPLANATION OF COMPARISON FUNCTIONS
51
EX
PLANATION OF COMPARIS
ON FUNCTIONS
Chapter
6
6-2.
Hysteresis
This function is to allow a margin for timing at which HI/LO of the HI/LO limit comparison is
turned off. Normally, HI is turned on when the indicated value exceeds the HI limit and is turned off
when the indicated value falls below it. However, by setting the hysteresis, HI is turned off when
the indicated value falls below the HI limit further lowered by the hysteresis value. This function is
effective to prevent chattering (phenomenon in which signals repeat turning on/off immediately
after switching of relay contacts and switch contacts) in such a case where signals fluctuate
(vibrate) subtly.
≪
Setting value
≫
Hysteresis range: 0 to 9999 (During low speed rotation mode: 0 to 999.9)
<
HI/LO output conditions
>
- HI
ON conditions
Indicated value
>
HI limit
OFF conditions
Indicated value
≦
(HI limit setting value
-
Hysteresis setting value)
- LO
ON conditions
Indicated value
<
LO limit
OFF conditions
Indicated value
≧
(LO limit setting value
-
Hysteresis setting value)
- Hysteresis operation
High limit value
Low limit value
+
0
Hysteresis range
Time
HI output
HI status display
LO output
LO status display
Output ON
Status ON
Output OFF
Status OFF
Output ON
Status ON
Output ON
Status ON
-
Output OFF
Status OFF
Output OFF
Status OFF
Indicated value
OK output
(Example:HI output, LO output, OK output)
Torque and rotation speed can be set to HI/LO limit comparison, respectively.
However, this does not apply to timing output and alarm HI and LO limits.
Point
Summary of Contents for TM380
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