Installation Of Dedicated Ct - Omron KM1 User Manual

0BPreparation
2.3 2.3

Installation of dedicated CT

Installation of dedicated CT

The dedicated CT is divided into the two types: split type and panel fixed (through) type. The dedicated CT is divided into the two types: split type and panel fixed (through) type.
[Common] [Common]
Measurement with single-phase 2-wire requires one dedicated CT, measurement with Measurement with single-phase 2-wire requires one dedicated CT, measurement with
single-phase 3-wire or 3-phase 3-wire requires two dedicated CTs, and measurement with single-phase 3-wire or 3-phase 3-wire requires two dedicated CTs, and measurement with
3-phase 4-wire requires three dedicated CTs. 3-phase 4-wire requires three dedicated CTs.
Use of dedicated CTs in a circuit requires all the CTs to have the same standard. Use of dedicated CTs in a circuit requires all the CTs to have the same standard.
The standard of the dedicated CTs to be used should match the settings of the dedicated The standard of the dedicated CTs to be used should match the settings of the dedicated
CT of Model KM1. CT of Model KM1.
A dedicated CT has its polarity. Carry out wiring correctly between (K) and (L). A dedicated CT has its polarity. Carry out wiring correctly between (K) and (L).
For terminal positions, refer to Page 2-14 and later. For terminal positions, refer to Page 2-14 and later.
Before making connections, confirm the directions of power supply side (K) and load side Before making connections, confirm the directions of power supply side (K) and load side
(L). Wrong direction prevents correct measurements. (L). Wrong direction prevents correct measurements.
Securely close the terminal cover on the secondary side of dedicated CT. Securely close the terminal cover on the secondary side of dedicated CT.
Do not ground the dedicated CT. Doing so causes a failure. Do not ground the dedicated CT. Doing so causes a failure.
Electric shocks may occur. Electric shocks may occur.
For the primary side wire to be clamped in CT, be sure to use a covered electric wire of 600 For the primary side wire to be clamped in CT, be sure to use a covered electric wire of 600
V or more in basic insulation. V or more in basic insulation.
When using a conductive object, such as bus bar, for clamping, ensure the basic insulation When using a conductive object, such as bus bar, for clamping, ensure the basic insulation
at least by, e.g., covering with an insulator. at least by, e.g., covering with an insulator.
Avoid direct clamping in a line of 600 VAC or more. Avoid direct clamping in a line of 600 VAC or more.
[Split type] [Split type]
Open the hook for the split/fixed type and clamp each phase. After clamping, securely Open the hook for the split/fixed type and clamp each phase. After clamping, securely
perform fitting until a clicking sound is heard. perform fitting until a clicking sound is heard.
[Panel fixing (through) type] [Panel fixing (through) type]
Securely fix the dedicated CT to the panel, etc. Securely fix the dedicated CT to the panel, etc.
Load side
負荷側
(L)
(Ｌ )
Hook for
分割/
split/fixing type
固定用フック
Split type Split type
2-12
Load side
Loading
電 源側
( K) side (K)
For fixing a banding
結束バンド等
band, etc.
の固定用
Terminal cover on the secondary
CT二次側
side of dedicated CT
端子カバー
負荷側
(L)
(L)
Panel fixing (through) type Panel fixing (through) type
Loading
電源側
side (K)
(K)