KB Electronics KBPC-240D - Manual (Page 15)

12
FIG. 11 – REMOTE
POTENTIOMETER
FIG. 12 – ANALOG VOLTAGE
FIG. 13 – REMOTE START/STOP SWITCH
FIG. 14 – INHIBIT CIRCUIT
Note: If the tach voltage is connected backwards, the control will drive the motor
at full speed only. Note: If the Forward-Brake-Reverse switch is used, provision
must be made to reverse the polarity of the tach-generator leads when the control
is switched to "Reverse."
Warning! To avoid erratic operation do not bundle AC Line and motor wires with
potentiometer, voltage following, enable, inhibit or other signal wiring. Use
shielded cables on all signal wiring over 12" (30 cm) – Do not ground shield.
F. Main Potentiometer – The control is supplied with
the main potentiometer prewired. However, the
control can also be operated from a remote
potentiometer, or from an Isolated analog voltage
for voltage following. To operate from an external
source remove white, orange and violet
potentiometer leads from terminals P1, P2 and P3.
The leads may be taped and left in the control. The
potentiometer itself may be removed, if a watertight seal is used to cover the hole in the
front cover.
1. Remote Potentiometer – Connect remote potentiometer wires to terminals P1, P2 and
P3, so that the "high" side of the potentiometer connects to P3, the "wiper" to P2 and
the "low" side to P1. (See figure 11.)
2. Analog Input – An isolated 0-5 or 0-10VDC
analog voltage can also be used to drive the
control. Note: If an isolated signal voltage is
not available, an optional signal isolator can
be installed (Model KBSI-240D, P/N 9431,
see figure 17, p. 20 for signal isolator wiring
diagrams). Connect the isolated input voltage
to terminal P2 (+) and P1 (–). (See fig. 12)
Note: Be sure jumper J7 corresponds to proper range of input voltage 0-10 or 0-
5VDC. When the potentiometer is disconnected from P1, P2 and P3 to connect an
analog input signal, the MIN trimpot will have to be adjusted clockwise to achieve a
0 + output voltage.
G. Remote Start/Stop Switch – A remote
Start/Stop Switch can be installed by
removing the wires from the "Start,"
"Com" and "Stop" terminals, and
reconnecting them to a remote switch.
(See fig. 13.) Note: To eliminate
Start/Stop function, join the "Start" &
"Com" Quick Connect terminals with a jumper.
H. Inhibit – The control can be
electronically stopped and started with
the Inhibit circuit. To "Stop" the
control, Terminals I1 & I2 must be
joined via a contact. The control can
be restarted by opening the contact.
Note: The Inhibit should not be used as a safety disconnect. Use only the AC Line
for that purpose. (See fig. 14.) Note: The Inhibit Circuit is not isolated. Do not common
or ground inhibit leads.
I. Enable – The control can also be started and stopped with an Enable circuit (the Enable
circuit functions opposite to that of the inhibit circuit; INHIBIT: open to start-close to stop,
ENABLE: open to stop-close to start). The Enable function is established by wiring a
contact in series with the violet potentiometer lead connected to terminal P3. (See fig. 15
on page 13.) The Enable circuit is not isolated. Do not common or ground wiring. Note:
The MIN speed trimpot must not be set higher then 70% CW rotation (approx. 2:00 o'clock
position) or Enable will not function.