10 - 17 10 - 17
10 MOUNTING AND INSTALLATION
MELSEC-ST
(b) Wiring by screw clamp connection
1) Cable connection
Insert the screwdriver into the tool hole, loosen the screw and insert
the wire into the wire hole. Then, tighten the screw within the torque
0.27 to 0.80 N m and pull the screwdriver. After the wire has been
clamped, gently pull the wire to confirm that it is secure.
2) Cable disconnection
Insert the screwdriver into the tool hole that corresponds to the
terminal to be removed, and loosen the screw. Then pull out the wire.
Tool hole
Wire hole
Screwdriver
Wire
Wire strip length
12 to 13mm
POINT
(1) If the wire strip length is too long, the conductive part may protrude over the
terminal block front, which increases the risk of electric shock or short circuit
between terminals. If the wire strip length is too short, this will result in the poor
contact.
(2) Make sure to use the screwdriver recommended in Appendix 4 or the
equivalent to connect/disconnect a cable.
The bar type crimping terminals used for wiring should comply with DIN 46228-
1.
(3) Start wiring (installation/removal) after removing the slice modules from the
base modules.
(4) Grounding
Ground the cable according to the steps (a) to (c) shown below.
(a) The independent grounding is most recommeded.
(b) When the independent grounding is not allowed, perform the common
grounding as shown below (2).
MELSEC-ST
system
Another
equipment
grounding
(1) Independent grounding.....Best
(2) Common grounding.....Good
(3) Joint grounding.....Not allowed
Another
equipment
Another
equipment
grounding
MELSEC-ST
system
MELSEC-ST
system
(c) For grounding, use the cable of 2 mm
2
or more.
Ground the cable closer to the MELSEC-ST system so that the grounding
cable will be short as possible.
Summary of Contents for MELESEC-ST
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