KB Electronics KBIC-240DS - Manual (Page 22)

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9.4 Voltage Following – All models can be controlled with an isolated analog reference voltage (0 -7 VDC)
in lieu of the main speed potentiometer. The voltage is connected to P2 (+) and F-. The control output
voltage will linearly follow the input voltage. The source impedance of the input should be 10K ohms or
less. The Min and Max trimpots are rendered inoperative in the voltage following mode. Use auxiliary
trimpots for scaling and to limit the control range. If the input signal is not isolated, or is a current signal
(4 - 20 mA), the KBSI-240D or SI-5 Barrier Terminal Board Signal Isolator must be used. It will allow
direct connection to process controllers and microprocessors.
CAUTION: The voltage feeding P2 and F- must be isolated from the AC line. Do not earth ground P2 or F- to
setup a zero or ground reference. 2. Do not bundle signal wires to P2 and F- with AC line or motor
connections. If signal wires are over 18 inches, use shielded cables.
9.5 Connection Methods – Additional methods for motor connections may be used. See Figure 11.
FIGURE 11. CONNECTION METHODS
KBIC ® WITH BARRIER TERMINAL
AC / DC MOTOR CONNECTION
L1 L2 A1 A2 F+ F- P1 P2 P3
ARMATURE FIELD
A+
AC POTENTIOMETER
U A-