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Wiring Precautions
Measuring Unit
・ Do not place transmission or input/output signal wires close to or bound together with
power or high-voltage lines in order to prevent noise interference. If installing transmission
or input/output signal wires next to power and high-voltage lines, maintain the separation
CAUTION
distances shown on the right table. (Except for terminal blocks.)
・ For actual usage, connect the frame GND terminal to ground (D-type ground). Connect it directly to the ground terminal.
・ Do not connect to frame GND terminal during insulation resistance or voltage resistance testing.
Use compatible solderless terminals. Refer to the compatible solderless terminals described in below table.
●
Use electrical wires as described in below table, and tighten the terminal screws according to the torques described below.
●
［EMU4-HD1-MB］
［EMU4-HD1-MB］
Auxiliary power and voltage input terminal
Current input and input/output terminal
［EMU4-BD1-MB］
［EMU4-BD1-MB］
Auxiliary power and voltage input terminal
Current input and input/output terminal
Before connecting the cable, make sure that the split-type current sensor is appropriately installed with the correct orientation. K => L is the correct orientation.
●
K: Power source side; L: load side
EMU-CT50, 100, 250, 400, and 600 are used only for low-voltage circuits (Maximum voltage: 460 V). They cannot be used for a high voltage circuit. Use EMU2-
●
CT5 and EMU2-CT5-4W transfixed the secondary side (5A) of the current transformer. They can only be used directly in a circuit that is 200 V or less (max. voltage
of 260 V).
The maximum voltage of a circuit directly connected to this unit is 260 V for EMU4-BD1-MB, or 277/480 V for EMU4-HD1-MB. Always be sure to use a
●
transformer for circuits exceeding this voltage. The value for the primary voltage of the transformer can be specified up to 6,600 V when using a transformer for
circuits.
Mitsubishi Electric recommends having an extra length of approximately 20 cm for MODBUS
●
Be careful not to touch the projecting parts of the terminal block cover when screwing the terminals at both ends of a terminal block.
●
Refer to the following if using external inputs or outputs.
●
External Input
External Input
For contact input
For contact input
X1
COM
X
Non-voltage Contact
Use a type appropriate for
5V 7 mA DC switching.
MODBUS
RTU （RS485） Communication
®
Connection of MODBUS
®
communication terminals (485+,
485-, SLD, and Ter):
1. Use shielded twisted pair cables for transmission wires.
(Refer to p. 16 for recommended cables.)
2. Connect terminating resistance (120 Ω) to both ends of
devices connected to MODBUS
transmission lines.
®
Terminating resistance of 120 Ω can be achieved by
short-circuiting terminals "485-" and "Ter" of this unit.
3. Connect to ground by using thick electrical wires so that
low impedance is achieved.
4. Do not place MODBUS
®
communication signal wires close
to or bound together with high-voltage lines.
5. Ground the SLD terminal at one end.
Compatible wire
AWG26-14 (Single/Stranded)
AWG22-14 (Single/Stranded)
Compatible wire
AWG24-16 (Single/Stranded)
AWG22-16 (Single/Stranded)
External Input
External Input
For pulse input
For pulse input
X1
COM
X
Transmitter
Non-voltage Contact
Use a type appropriate for
5V 7 mA DC switching.
OR
PLC
Power lines of 600 V or less
Other power lines
Tightening torque
0.8〜1.0N ・ m
For M3.5 screws with an external diameter of 5.6 mm or less
0.5〜0.6N ・ m
For M3.5 screws with an external diameter of 5.6 mm or less
Tightening torque
0.8N ・ m
For M3 screws with an external diameter of 5.6 mm or less
0.5〜0.6N ・ m
For M3 screws with an external diameter of 5.6 mm or less
®
communication wiring.
External Output
External Output
For contact output
For contact output
Y1
COM
Y
Relay
35V 75 mA DC
or 24V 75 mA AC
(Power factor 1)
LAN
MODBUS
®
RTU （RS485）
or
USB
120Ω
Terminating
Resistance
PC
Measuring Unit
Max. amount of connected units: 31
Condition
Distance
300 mm or more
600 mm or more
Compatible solderless terminal
Compatible solderless terminal
External Output
External Output
For pulse output
For pulse output
Y1
COM
Y
Counter
35V 75 mA DC
or 24 V 75 mA AC
(Power factor 1)
120Ω
Terminating
Resistance
Measuring Unit
Measuring Unit
26
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