KB Electronics KBSI-240D KBSI Signal Isolator - Manual (Page 4)

I. INTRODUCTION
The KBSI-240D Signal Isolator is used to isolate, amplify and condition DC voltage and current
signals from any source (motors, tachs and transducers) which will drive most variable speed
motor controls with a voltage following input. The maximum output voltage of the isolator is 10
volts, which is a linear function of the input signal.
The KBSI-240D is versatile since it can accommodate a wide range of input voltages (0 - 25*,
0 - 120 and 0 - 550V DC) and, in addition, a wide range of input current signals (4 - 20 mA,
10 - 50 mA and 1 - 5 mA). The Voltage/Current (“VLT/CUR”) jumper is used to change the
KBSI-240D from a voltage to current input.
A built-in power supply enables the KBSI-240D to be controlled with a 5KΩ remote poten-
tiometer (connect potentiometer to terminals “P1,” “5” and “6” – see page 9). The potentiome-
ter can also be wired for Auto/Manual Operation.
*The input range of 0 - 25V is the maximum voltage that can be applied to terminals “5” and
“6”. The minimum input voltage is 0 - 5 volts, which can achieve an output voltage of 0 - 10
volts. The unit is factory calibrated so that a 0 - 10V DC input yields a 0 - 10V DC output.
II. MOUNTING
Mount the Signal Isolator using (4) 6-32 screws (not included). Use the Control Layout and
Mechanical Specifications drawing on page 3 to locate the mounting holes. The unit is
designed to be mounted in any position providing its components do not come in contact with
grounded or live wiring.
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