Mitsubishi Electric EMU4-FD1-MB User Manual page 13

*1 For low voltage circuits, do not connect to grounding the secondary side of VT and CT.
*2 When this unit is used at a high voltage circuit, the terminal P0 (P2) must be connected to ground.
*3 When grounding a CT line, please make the L side of the CT a common line and connect 1L,2L,3L terminal
for the unit side by the shortest course.
*4 When connecting the L side of the CT by a common line, please connect 1L, 2L, 3L terminal for the unit
side by the shortest course.
・ For protection against noise, transmission lines and input/output lines shall not be placed close to or bound
together with the power lines and high-voltage lines. Keep distance as below between them. (except for
the terminal block)
Condition
Power line 600V or less
Other power line
・ For the actual usage, connect the FG terminal to ground. (D-type ground: Type 3) Connect it directly to the
ground terminal.
This is being bonded to the conductive part of the product for safety reasons and being connected to the
terminal which is connected the outside protection grounding system.
Caution
Do not connect to FG terminal during the insulation resistance test and pressure test.
・
Do not connect together more than one EMU4-FD1-MB on the secondary side of a current transformer.
・
Do not connect together other units and EMU4-FD1-MB on the secondary side of a current transformer.
・
･ Use appropriate crimp-type terminal. Appropriate crimp-type terminal is as below.
･ Use electric wires as below, and tighten the terminal screws by the torque as below.
Auxiliary power, voltage
input terminals
Current input terminals
Input and output terminals
*5: If the diameter of the wire is small, the conductor resistance of the wire will be high and the consumption VA of the wire will increase.
Decide wire diameter and wire length so that it does not exceed the rated burden of CT to be connected.
･ Maximum voltage of the circuit connected to this unit directly is 277 / 480V. For the circuit over this voltage, use the transformer.
Using the transformer, primary voltage is configurable up to 6600V.
(Primary voltage of VT can be set up to 6600V, and secondary voltage of VT can be set up to220V as optional setting.)
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･ For MODBUS RTU communication wiring, recommended to have the extra length wires about 200mm (When extended to B /
NET transmission from MODBUS
･ When screwing the terminals at both ends of the terminal block, be careful not to touch the projection of the terminal block cover.
･ In case using external input and/or external output, refer to the following.
External input：For the case of contact input
No-voltage a-contact
Use an appropriate type for
5V DC 7mA switching.
External output：For the case of contact output
Relay
distance
300mm or longer
600mm or longer
Applicable wire
stranded wire: AWG26-14(0.13～2.0mm
single wire : AWG26-14(φ0.41～1.62mm)
stranded wire: AWG18-14(0.82～2.0mm
single wire : AWG18-14(φ1.03～1.62mm)
stranded wire : AWG22-14(0.33～2.0mm
single wire : AWG22-14(φ0.65～1.62mm)
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communication, use of MODBUS
No-voltage a-contact
35V DC 75mA or,
24V AC 75mA (power factor : 1)
Tightening Recommended crimp-type terminal
torque
For M3.5 screw of external diameter below 5.6mm
2 ) 0.8～1.0N・m
For M3 screw of external diameter below 5.6mm
2 ) *5 0.5～0.6N・m
2 For M3 screw of external diameter below 5.6mm
) 0.5～0.6N・m
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RTU communication wiring is possible).
External input: For the case of pulse input
Transmitter
External output: For the case of pulse output
Counter
(12/71)
No-voltage a-contact
Use an appropriate type for
5V DC 7mA switching.
No-voltage a-contact
35V DC 75mA or,
24V AC 75mA (power factor : 1)