Wiring - Mitsubishi Electric MELSEC iQ-R Series User Manual

Section 6 SETTING AND PROCEDURE FOR OPERATION
6.3

Wiring

6.3.1 Precautions for wiring
● For protection against noise, input 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
High-voltage line 600V or less
Other high-voltage line
(1) Maximum voltage of the circuit connected to RE81WH is 260V. For the circuit over this voltage, surely
use the transformer. When using the transformer, primary voltage is configurable up to 6600V. Secondary
voltage can be setup to 110V or 220V. (Primary voltage of VT can be set up to 6600V, and secondary
voltage of VT can be set up to 220V as optional setting.)
(2) Before connecting the cable, make sure that the orientation of the current sensor is correct for attachment.
K to L is the correct direction. K: power source side, L: load side.
(3) Use insulation wire rather than basic insulation for the primary side cable of current sensor.
(4) Do not ground the secondary side of the current sensor.
(5) Dedicated current sensor (excludes EMU2-CT5) is extendable up to 50m.
(6) EMU2-CT5 is extendable up to 11m, using together with an extension cable. To extend the wire further,
use the current transformer CW-5S(L) for split-type instrument in combination, extending the secondary
wiring on CW-5S(L) side.
(7) The available transformer ratio is 220/110 V to 6600/110 V. For connection to P1 to P3 terminals on this
module, connect the secondary of transformer. Make sure that terminal symbols are correct.
(8) Dedicated current sensor (excludes EMU2-CT5 and EMU-CT5-A) is used only for low voltage circuit. It
cannot be used for a high voltage circuit. EMU2-CT5 and EMU-CT5-A should be used with the secondary
side (5A) of transformer transfixed. If they are used for the circuit directly, they should be used under
200V.
(9) For input wiring of the measurement circuit, use separate cables from other external signals in order to
prevent from AC surge and induction.
(10) Keep any object off the cables.
(11) Protect cable coating from scratch.
(12) 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 22N)
(13) Please do not connect two or more cables to one terminal hole of the current input terminal block. If the
engagement of the terminal becomes weak, cable may fall out.
Caution
Distance
300mm or more
600mm or more
101
RE81WH