Mitsubishi Electric MELSEC Q Series User Manual page 59

4 INSTALLATION, WIRING, START-UP, AND MAINTENANCE
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 Section 4.2.1)
Put the SSCNET cable in the duct or fix the cable at the closest part to the QD74MH 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.
SSCNET 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.
If the adhesion of solvent and oil to the cord part of SSCNET cable may lower the optical
characteristic and machine characteristic. If it is used such an environment, be sure to do the
protection measures to the cord part.
When keeping the QD74MH or servo amplifier, be sure to put on a cap to connector part so that a dirt
should not adhere to the end of SSCNET connector.
SSCNET connector to connect the SSCNET cable is put a cap to protect light device inside
connector from dust. For this reason, do not remove a cap until just before connecting SSCNET
cable. Then, when removing SSCNET cable, make sure to put a cap.
Keep the cap and the tube for protecting light cord end of SSCNET cable in a plastic bag with a
zipper of SSCNET cable to prevent them from becoming dirty.
CAUTION
Optical cord
Cord
Cable
Cable
4 - 10
MELSEC-Q