 M-System
has a solution using the CLSC-10 Clamp AC Sensor and the AS4CT CT Digital
Alarm. The CLSC is a clamp-type current sensor with an AC output of 0
to 1 A and can be mounted to hot lines. Furthermore, the CLSC incorporates
an overvoltage clamp element, which ensures safety because no high voltage
is generated if the output terminals are open. The AS4CT provides quad
relay outputs at preset AC current levels from the CLSC. Originally, the
AS4CT was developed as a comparator alarm. In your case, output contact
signals as comparison results are combined to indicate the zone of the
input signal classified by four set values (e.g., 40, 43, 47, and 50 A).
The ON-delay time of the contact signals can be adjusted between 0 and
99 seconds so that the in-rush current will not be indicated.
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We
are monitoring the power of a production line. Although the instantaneous
power is already monitoring at the central monitor room, additionally
we like to display rough value of current at site. Specifically, we want
to classify the current values into three to four levels in advance and
display the present current value with the corresponding lamp lit. We
need to install measuring equipment easily without interrupting the facilities,
and furthermore, we do not want to have the generated in-rush current
at the time of starting the facilities indicated by the lamps. Is there
any method to realize these requirements? The normal AC current is around
45 A and the maximum current is around 50 A.