Wiring
KW2M-A/X User's Manual
15
4.5 How to attach the Current Transformer (CT)
・
Use a CT with a secondary side current of 5A or 1A.
・
One CT is needed when measuring 1-circuit of 1P2W. Two CTs are needed when measuring
1P3W/3P3W (4 CTs for 2-circuit).Three CTs are needed when measuring 3P4W (6 CTs for 2-circuit).
If you use all CTs for one unit, they should be all measuring the same type of system.
・
Use the coorect wire or it might cause a breakdown, burnout or electric shock.
・
When connecting a 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
the CT.
・
The CT has polarity. Wire correctly according to the K and L marks.
When the polarity is wrong, the
device cannot measure correctly.
･
If there is some distortion by harmonic or waveform, the device may not measure correctly. Please
perform some tests with the actual system before going live.
・
Separate the wiring (strong electric part) of the measured voltage input terminal (operating power
supply terminal) from the CT cable. Otherwise, noise may have an adverse effect on the accuracy.
DANGER
●
Never open the secondary circuit of CT under applying current to load.
