User Guide

i. Current Input Signal
Warning! Read Safety Warning on Page 1
before attempting to use this control.
Note:
The Voltage/Current (VLT/CUR) jumper must be in “CUR”
position. Connect the negative current signal input to terminal “5”
and the positive to terminal “6.” The KBSI-240D is factory calibrat-
ed so that a 4 - 20mA signal will provide a 0 - 9 Volt output. The
input range can be converted to a 10 - 50mA range by attaching a
150Ω 1W resistor across the current input terminals “5” and “6.”
See figure 3. Control must be recalibrated when the 150Ω resistor is installed. The range of
signal input can be changed to 1 - 5mA by removing resistor R3 from the printed circuit board.
Recalibrate the Signal Isolator to follow a 4 - 20mA current signal input as follows:
1. Connect a 10V DC meter (digital DC meter is suggested) to terminals “9”(-) & “10” (+).
2. Apply the minimum input current (4mA) at terminals “5” and “6.”
3. Adjust the “MIN” trimpot to an output voltage of 0 volt DC.
4. Set the input current to 20mA and adjust the “MAX” trimpot so that the output voltage is at
the desired level (9V DC).
5. Repeat steps 3 and 4 if extreme accuracy is required. The Signal Isolator is now cali-
brated to provide 0 - 9V DC output with a 4 - 20mA input.
6. Use the “MIN” and “MAX” trimpot if other than 0 - 9V DC output is required with the respec-
tive input current range.
6
56
150Ω Resistor
Converts 4 - 20mA

to 10 - 50mA
+–
4 - 20mA
FIGURE 3 – CURRENT INPUT
SIGNAL CONNECTION
!