The Supply Of 5Vdc For The Bypass Function; Precaution In Mounting - Hitachi Hidic EH-150 EH-OLNK Applications Manual

5.1.4 The supply of 5VDC for the bypass function

Even if a power supply is turned off, the optical CPU link module equips the bypass function not to make a
link system decline. You must supply 5VDC (No power failure) to the connector for the 5VDC supply from
the outside to make a bypass function effective.
A precaution to supply 5VDC from the outside is shown in the following.
Power supply
(No power failure)
AC / DC
Noise
Filter
D-type earth
1. Supply a fixed voltage power supply to the module. ( Fixed output voltage 5V DC, Permissible variable
range : ± 10%, Output current : more than 0.5A) And, use the power supply which has an over-voltage/over-
current protection function as much as possible.
2. Use a power supply device for 1 base, and prepare for a power supply device in each base.
3. The wire for the power supply to the module is to use shield line. And, separate from other cables (in such
cases as the one for I/O). (Connect shield to ground on the power supply side. )
4. The wire for the power supply to the module is to use the line of a thickness 0.75mm
length less than 1m.
5. Try to restrain mixing of the noise to the 5VDC line as much as possible. A noise filter is installed in the
AC/DC line of the fixed voltage power supply device.
6. Adjust the establishment of the voltage of the power supply to become 5.00～5.20VDC on the connector
side for the 5VDC supply of the optical CPU link module. (Voltage measurement is to use a digital volt
meter and so on.)

5.1.5 Precaution in mounting

Optical fiber cable which connects the optical type CPU link module is different from the usual electric
cable, and very delicate. When therefore handling is mistaken, optical fiber is sometimes made out. The
permissible bending radius of the cable exists in optical fiber cable. Please secure the space to under the
module. ( more than " Length of a connector (approx. 45mm) + Permissible bending radius" )
(As for Permissible bending radius, Please refer to the appendix .1.)
FG
5V DC
0V DC
Fixed voltage
power supply
Shield Cable
(more than 0.75mm
A duct for wiring
Figure 5.3 Wiring of power supply for bypass function
Connector (approx. 45mm)
Permissible bending
radius
Optical fiber cable
Figure 5.4 Wiring space of optical cable
5-3
Chapter 5. Installation and start-up
5V DC
Optical fiber
Cable
2
, Max. 1m )
2
Security of space is
necessary
and more. And, make