KB Electronics KBPC-240D Installation And Operation Manual Supplement page 35

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 6D – AUTO/MANUAL OPERATION WITH POTENTIOMETER ON KBSI INPUT
Process
Signal
0 - 10V DC
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.
FIGURE 6C – PROCESS CONTROL WITH AUTO (RATIO POT)/MANUAL SWITCH
Auto
W/Ratio
10(+)
KBSI-240D
9(-)
Auto/Man 5K Pot
6
5
Manual
5K Pot
P1
10(+)
KBSI-240D
9(-)
P3
A(+)
KB
P2
CONTROL
A(-)
F(-)
P2 A(+)
KB
CONTROL
F(-) A(-)
Motor
Motor
11