Eaton IQ 250, Руководство пользователя и инструкция по установке

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Chapter 8:
IQ 250/260 Meter Programming the IQ 250/260
www.eaton.com
IB02601006E
8-13
To
Configure
a
Limit
:
Double-click on the
Field
to set the following values:
Above
and
Below Set Point
: % of Full Scale (the point at which the reading goes out of limit)
Examples
: 100% of 120V Full Scale = 120V
90% of 120V Full Scale = 108V
Above
and
Below Return Hysteresis
: (the point at which the reading goes back within limit)
Examples
: Above Set Point = 110% Below Set Point = 90%
(Out of Limit above 132V) (Out of Limit below 108V)
Above Return Hysteresis = 105% Below Return Hysteresis = 95%
(Stay Out of Limit until below 126V) (Stay Out of Limit until above 114V)
The Primary fields are display only . They show what the set point and return hysteresis value are for each limit.
NOTES :
• If you are entering negative limits , be aware that the negative value affects the way the above and below limits
function, since negative numbers are processed as signed values .
• If the Above Return Hysteresis is greater than the Above Set Point, the Above Limit is Disabled; if the Below
Return Hysteresis is less than the Below Set Point, the Below Limit is Disabled. You may want to use this feature
to disable either Above or Below Limit conditions for a reading.
TIME
Above Limit
condition
Below Limit
condition
Above Limit Trigger point
Return point from Above Limit condition
Below Limit Trigger point
Return point from Below Limit condition
HYSTERESIS
HYSTERESIS
-
MEASURED VALUE
(if applicable)
+
MEASURED VALUE
0