Mitsubishi Electric Melsec Q Series User Manual page 85

7 Setting and procedure for operation
■ How to attach EMU-CT50/CT100/CT250
Follow the procedure below to attach to the cable of the target
circuit.
1) Open the movable core, as shown in the figure on the right.
Lift slowly the hooks located on both sides of the movable core, and
detach them from the stopper. Do not force to open it. You may
break the hook.
2) Do not let the cable touch on the core-spilt surface. Thus, carefully
pass the cable from underneath. Before passing the cable, check the
direction symbols of K and L, in order to attach the sensor in the
correct orientation. (Direction from power source
side (K) to load side (L) is indicated with the
arrow.)
3) Make sure no dust or foreign object is attached
on the split-core surface, and after that, close the
movable core. Lift the movable core until the
stoppers are firmly locked. (When the hooks on both side of movable
core are locked to the stoppers, you will hear click sound twice.)
4) Put a binding cable through a hole for fixing the current sensor, and
then tie it with the cable. Do not tie it too tightly. (Holes for fixing the
current sensor are located on both side of the current sensor. )
5) Cut off the extra portion of binding cable, using a nipper, etc, to
avoid interference of the cable.
6) Lift a protective cover of the secondary terminal, by holding the center
portion of the protective cover, and remove it. And then, connect the
given sensor cable. Check the terminal symbols printed on the
secondary terminal surface, so that connection is performed
correctly.
Supplementary -----------------------------------------------------------------------
 When opening the movable core on current sensor, do not widen the hook for fixing the
movable core too widely. It may break the hook.
 Refer to the table below for appropriate size of electric wires.
Usable wires
size (reference)
Size of electric wires conforms to what is described in the catalog of general PVC insulated
wires. Thickness of external PVC insulation is different for different wire. Check with the external
dimension diagram of this product and make sure the wire can go through the given space.
EMU-CT50 EMU-CT100
IV cable 60 mm 2 or less 60 mm
CV cable 38 mm 2 or less 38 mm
7 - 13
Protective cover
Movable core
Fixing hook
Movable core
Stopper
Hole for fixing
(3×2)
Current
direction
Binding band
EMU-CT250
2 or less 150 mm 2 or less
2 or less 150 mm 2 or less
QE81WH
Movable core
Fixing hook
Primary
conductor
(Cable)
Movable core split
surface
Hole for fixing
(3×2)
Primary
conductor
(Cable)
Binding band