Wiring Procedures; Connection Of Voltage Lines, Sensors Cable And Sensors - Mitsubishi Electric EcoMonitorPro EMU2-RD3-F Instruction Manual

8.

Wiring Procedures

• Connect all cables. When wiring, check the phase and wire system of the circuit to be connected, and see the relevant wiring
diagram. When connecting a potential transformer or a current transformer, see the transformer instruction manual.
• If the current sensor is installed in a strong magnetic field near a transformer or a large current cable bus bar, the measurements may be
affected. Install the sensor as far as possible from such a device.
8.1 Connection of voltage lines, sensor cables and sensors
Below given is an example of connection for measurement of some transformer systems (differing in voltage and number of phases and
wires) by one unit (example of connection of EMU2-RD7-C).
Circuit 1: 3-phase 3-wire system, primary voltage 690 V, primary current 800 A (A 690 V/110 V potential transformer is separately
necessary.)
Circuit 2: 3-phase 3-wire system, primary voltage 440 V, primary current 250 A (A 440 V/110 V potential transformer is separately
necessary.)
Circuit 3: Not used
Circuit 4: Single-phase 2-wire system, primary voltage 110 V, primary current 50 A
Circuit 5: Single-phase 3-wire system, primary voltage 110 V, primary current 100 A
Circuit 6: 3-phase 3-wire system, primary voltage 2200 V, primary current 400 A (A 2200 V/110 V potential transformer is separately
necessary.)
Circuit 7: Single-phase 2-wire system, primary voltage 110 V, primary current 50 A
Circuit 2
EMU2-CT5
Circuit 1
R
S
T
Current
transformer
Supplementation ---------------------------------------------------------------------------------------------------------------------------------------------------------------
When the unit is used for a single-phase 2-wire circuit, the side 3 of the current sensor cable is not used. Disconnect the side 3 of the cable
from the connector, and protect the terminal with insulating tape as shown below.
Circuit 4
R
S
T
Potential
transformer
440/110
～
100 to 220 V
AC
Potential
transformer
690/110
R
N
Circuit 5
Insulation tape
R
N
(7/32)
Current
transformer
R
S
T
Potential
transformer
2200/110
EMU2-CT5
R
N
Circuit 7
Circuit 6