Rockwell Automation FlexPak 3000 115 VAC Control Opt. Board M/N 917FK0101 - Manual (Page 17)

AĆ1
Appendix A
115 VAC Control Option Board Circuitry
The Control Option Board circuitry consists of ten identical AĆC inputs which are optically coupled to DĆC
sourceoutputs. Oneof thecircuits is shown below in figureA.1. Theincoming AĆC is limited by an 8.2K resisĆ
tor and rectified and dropped across a 2.4K resistor in series with 182 ohms. The 182 ohm resistor limits the
turnĆon voltageof theoptical isolator. When theoptical isolator is turned on, it sinks theinput of theSource
Driver, which supplies a DĆC voltage at its output. The Source Driver internally drops a maximum of 2 volts
from theDĆC sourcevoltage(VS).
VS
7.2K
SOURCE DRIVER
8.2K 2W .
01
AC LO
1uF 182
GND
2.4K 1W
GND
3K
AC HI
DC OUT
7.2K
10K
FigureA.1 Ć 115 VAC Control Option Board Circuitry