Yaskawa MP920 Communications Module - Manual (Page 312)

Appendix D Wiring Communications
D.4.2 Indoor and Outdoor Panel-to-Panel Optical Wiring
D-20
„ Connecting Optical Fiber Cords or Cables
The following methods can be used to connect crystal glass optical fiber cables outside a con-
trol panel to Optical Repeaters inside the control panel or connect optical fiber cables
between control panels. Use an appropriate method.
H-PCF optical fiber cables cannot be connected with each other.
The maximum transmission distance varies according to the optical fiber cable connection
method (fusing connection or connector relay connection) and the connection position.
Refer to the next section „Calculating the Maximum Transmission Distance for details on
how to determine the maximum transmission distance (L).
Fusing Connection Method
This method connects optical fiber cables inside a control panel to optical fiber cables outside
the control panel or connect optical fiber cables between control panels by fusing these
cables. Terminal boxes are used to connect the cables.
The connection loss will be 0.1 to 0.2 dB per connection (at intervals of 500 to 1,000 m
max.).
Connector Connection Method
This method connects the connectors of optical fiber cables inside and outside a control panel
or the connectors of optical fiber cables between control panels by using Conversion Adapt-
ers. Terminal Boxes are used to connect these connectors.
Note that Conversion Adapter connection loss varies according to the method for grinding
the tip of the optical connector ferrule.
The optical connector grinding methods and the connection loss values are as follows:
• Connection loss when using PC grinding for FC connectors: 0.8 dB per connection
• Connection loss when using flat grinding for FC connectors: 1.2 dB per connection
IMPORTANT
Control panel
Two-core crystal glass
optical fiber cable
Control panel
Terminal box Terminal box
Optical Repeater Optical Repeater
Optical connector
Fusing connection