Configure Point Limits
Mlink allows you to set up ten point limits for each of
the five profiles. Point Limits allow you to setup dif-
ferent stages of triggering tailored to monitor voltage
(or current) sags and swells. Set up each point limit in
the same manner, and place them in any order. This
makes setting them up very flexible.
In the example below (Figure 13) there are three
separate point limits defined. All of the limit func-
tions are X
>
Limit; two limit formats are absolute and
one is percent. The limits are defined in decreasing
voltages as 150, 140 and 120 with the first two fixed
limits and one as a sliding reference. Each point is
assigned a different dwell time: 1, 4 and 12 half-cycles
respectively.
Use a sliding reference, for example, to provide a
gradually changing
limit to account for a line voltage
that changes slowly throughout the day.
The slid-
ing reference uses the method described in IEC-61000-
4-30, paragraph 5.4.4, and should eliminate needless
triggers during normal operation. Hard limits could
be used for extreme voltage swings.
Point Limit Definitions
Point:
denotes the number of the Point Limit (1 -
10). You can define up to 10 different points to
measure the selected value (e.g. voltage or current).
Limit Function:
set to OFF, X
<
Limit, X
>
Limit.
Limit Format:
set to Absolute or Percent.
Absolute refers to the the actual measured value (e.g.
X (voltage)
>
130 Vrms). Percent refers to a percent
of the measured value (e.g. 105 percent of the
measured value, entered as 1.05).
78
Summary of Contents for 928A
Page 1: ...MODEL 928A USER S MANUAL Arbiter Systems Inc Paso Robles CA 93446 U S A ...
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Page 57: ...Channel B Combined Caution For current probe use see CT Probe Use on page 4 43 ...
Page 112: ...CT Cable Connector Figure 16 CT Cable Connector side view Figure 17 CT Connector End View 98 ...
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Page 115: ...CE Mark Certification ...
