KB Electronics KBSI-240D KBSI Signal Isolator - Manual (Page 13)

Note: The preceding circuit provides for the speed pot to be used in “MAN” mode only. In “AUT0”
mode, the process control signal is supplied directly to the signal isolator.
11
Motor
A(-) F(-)
A(+)
P3
Auto
W/Ratio
Manual
5K Pot
10(+)
9(-)
P2 KB
CONTROL
KBSI-240D
The following circuit
provides for dual pur-
pose usage of the
speed pot. In the
“AUTO” mode it is
used for ratio control
and in the “MAN”
mode it is used for
manual speed adjust-
ment.
FIGURE 6C – PROCESS CONTROL WITH AUTO (RATIO POT)/MANUAL SWITCH
Motor
F(-)
P2
A(-)
A(+)
9(-)
10(+)
5
6
P1
Auto/Man 5K Pot
KB
CONTROL
Process
Signal
0 - 10V DC
KBSI-240D
FIGURE 6D – AUTO/MANUAL OPERATION WITH POTENTIOMETER ON KBSI INPUT