Wiring - Mitsubishi Electric Melsec Q Series User Manual

7 Setting and procedure for operation

7.5 Wiring

7.5.1 Precautions for wiring
(1) Connect cables. For connecting voltage transformer and current transformer, refer to
the corresponding wiring diagram.
(2) For wiring, check with the wiring diagram and check phase wire system for the
connecting circuit.
(3) For the current circuit input, Mitsubishi's current sensor is required. (Refer to section
7.5.3)
(4) If a current sensor is located in a strong magnetic field such as an area nearby a
transformer or high-current cable bus bar, the voltage circuit input may be influenced,
which in turn affects the measured value. Thus, please ensure sufficient distance
between devices.
(5) For input wiring of the measurement circuit, use separate cables from other external
signals in order to prevent from AC surge and induction.
(6) Keep any object off the cables.
(7) Protect cable coating from scratch.
(8) Cable length should be routed in length with a margin, please take care to avoid causing
stress to pull the terminal block. (Tensile load: less than 22 N)
(9) Please do not connect two or more cables to one terminal hole of the current input
terminal block. The engagement of the terminal becomes weak, and cable may fall
out.
(10)For the actual usage, connect the FG terminal to ground. (D-type ground: Type 3)
Connect it directly to the ground terminal.
Condition
Power line carrying 600 V or lower
and 600 A or lower
Other power lines
Distance
300 mm or longer
600 mm or longer
7 - 6
QE81WH