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MELSEC-Q
4 INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT
CAUTION
After removal of the SSCNET cable, be sure to put a cap on the SSCNET connector.
Otherwise, adhesion of dirt deteriorates in characteristic and it may cause malfunctions.
Do not remove the SSCNET cable while turning on the power supply of QD75MH and servo
amplifier. Do not see directly the light generated from SSCNET
connector and the end of
SSCNET
cable. When the light gets into eye, may feel something is wrong for eye. (The light
source of SSCNET
cable complies with class1 defined in JISC6802 or IEC60825-1.)
If the SSCNET cable is added a power such as a major shock, lateral pressure, haul, sudden
bending or twist, its inside distorts or breaks, and optical transmission will not be available.
Be sure to take care enough so that the short SSCNET
cable is added a twist easily.
Be sure to use the SSCNET cable within the range of operating temperature described in this
manual. Especially, as optical fiber for MR-J3BUS
M and MR-J3BUS M-A are made of
synthetic resin, it melts down if being left near the fire or high temperature. Therefore, do not
make it touched the part which becomes high temperature, such as radiator or regenerative
option of servo amplifier, or servomotor.
When laying the SSCNET cable, be sure to secure the minimum cable bend radius or more.
(Refer to this Section [2] Precautions for SSCNET
cable wiring.)
Put the SSCNET cable in the duct or fix the cable at the closest part to the QD75MH with
bundle material in order to prevent SSCNET
cable from putting its own weight on SSCNET
connector. When laying cable, the optical cord should be given loose slack to avoid from
becoming smaller than the minimum bend radius, and it should not be twisted.
Also, fix and hold it in position with using cushioning such as sponge or rubber which does not
contain plasticizing material.
Migrating plasticizer is used for vinyl tape. Keep the MR-J3BUS M, and MR-J3BUS M-A
cables away from vinyl tape because the optical characteristic may be affected.
Optical cord
Cable
SSCNET cable Cord Cable
MR-J3BUS M
MR-J3BUS M-A
MR-J3BUS M-B
: Normally, cable is not affected by plasticizer.
: Phthalate ester plasticizer such as DBP and DOP may affect optical characteristic of cable.
Generally, soft polyvinyl chloride (PVC), polyethylene resin (PE) and fluorine resin contain non-
migrating plasticizer and they do not affect the optical characteristic of SSCNET
cable.
However, some wire sheaths and cable ties, which contain migrating plasticizer (phthalate
ester), may affect MR-J3BUS
M and MR-J3BUS M-A cables (made of plastic).
In addition, MR-J3BUS
M-B cable (made of quartz glass) is not affected by plasticizer.