Section 75
00-02-0522
04-06-11 -
47 -
J10 – Connections from the CT’s
The most accurate method of measuring current will be to connect each wire from each of the
CT
’
s directly to the controller at J10. The controller offers a low impedance path to neutral
(~.25 Ohms) so the common mode voltage will be well within a safe range.
In applications where the CT
’
s are commoned together (4 wires - CT1+, CT2 +, CT3+ and
CT common) the system will only read 1/2 of the current signal, unless the iGUARD is
programmed to reflect commoned CT
’
s.
The iGUARD supports both, full differential CT inputs (both wires from each CT brought back
to the EMB) and
“
commoned
”
CTs (where the high sides are brought back individually but
the low sides are all connected together). See the following illustration of current input
construction.
Phase-out
/ Discontinued
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