How To Attach The Current Transformer (Ct) - Panasonic KW9M User Manual

3.3 How to attach the Current Transformer (CT)

DANGER
●Never open the secondary circuit of CT under applying current to load.
●Never remove the terminal block under applying current to load.
Will cause electric shock or breakdown CT
・Use CT that the secondary side current is 5A or 1A, the rated burden 0.5VA or more.
・One CT is needed for 1 unit when measuring 1P2W (2 CTs for 2-circuit, 3CTs for 3-circuit). Two CTs
are needed when measuring 1P3W/3P3W. Three CTs are needed when measuring 3P4W.
Using all CTs for one unit should be the same.
・Use the applicable wire, or it might cause a breakdown, burnout or electric shock.
・When connecting CT, connect the secondary side to the terminal of the main unit first, and after that
wire the primary side to a load electric wire. Incorrect order might cause an electric shock or break CT.
・The CT has polarity. Wire correctly according to the K and L marks. Wrong direction can't measure
correctly.
･If there is some distortion by harmonic or waveform, it may not measure correctly.
Please check with the actual system before adopts it.
・Separate the wiring (strong electric part) of the measured voltage input terminal (operating power
supply terminal) from the CT cable. It may not satisfy the accuracy due to noise.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
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