KB Electronics KBSI-240D KBSI Signal Isolator - Manual (Page 10)

a) Connect the armature of the main motor to the SI input terminals “5” (-) and “7” (+).
b) Set the armature voltage of the main motor to zero (0). Adjust the “MIN” trimpot so that
the output at terminals “9” and “10” reads zero (0) volts.
c) Reset the armature voltage of the main motor to 90V. Adjust the “MAX” trimpot so that
the output voltage is 9V DC.
Notes:
1. When setting the output voltage using the “MIN” and “MAX” trimpots the voltage or speed
of the driven motor can be read directly instead of using the output of the KBSI.
2. When readjusting the “MIN” and “MAX” trimpots, always set the minimum voltage first and
then the maximum voltage.
3. Trimpots allow approximately 20 turns for the full range of adjustment. If during the adjust-
ment procedure the output stops changing, try reversing the direction of rotation of trimpot.
IV. OUTPUT SIGNAL
The output signal from the SI is obtained from terminals “9” (-) and “10” (+). Connect the out-
put directly to the signal following input terminal of the speed control. For multiple follower
motors, several controls can be driven from a single KBSI-240D. Be sure the AC line connec-
tions to the follower control are to the same phase (eg, L1 to L1 and L2 to L2 of all controls.)
The output from the KBSI-240D can be scaled to control the speed control over any desired
speed range. Adjust the “MIN” trimpot to provide the desired minimum speed and the “MAX”
trimpot to provide the desired maximum speed.
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