KB Electronics KBPC-225D User Manual

Page 11

FIG. 6A – FULL VOLTAGE FIELD

180 VDC MOTORS WITH 200 VDC FIELDS

FIELD

TB1

TB2

LINE

ARM

–

FIG. 6B – HALF VOLTAGE FIELD

180 VDC MOTORS WITH 100 VDC FIELDS

FIELD

TB2

TB1

LINE

ARM

–

D. Ground – Be sure to ground (earth) the control by connecting a ground wire to the Green

Ground Screw located to the right of the terminal block. (See Fig. 1, p. 5)

E. DC Tachometer Input – If tachometer feedback is required, an analog tach signal must be

connected to the terminal block TB3.

Note: For tachometer feedback, Jumper J3 must be set to the "TFB" position, jumper J6
must be set for the proper tach voltage, and the IR COMP must be set to minimum (ccw)
position. (See Section III C, p. 7.)

Connect the tachometer so that when the motor rotates the positive tach voltage lead is
connected to T+ and the negative tach lead is connected to T–. (See Fig. 7.)

Note: If the tach voltage is connected backwards, the control will drive the motor
at full speed only. If the Forward-Brake-Reverse switch is used, provision must
be made to reverse the polarity of the tachometer leads when the control is
switched to "Reverse."

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,
provided a watertight seal is used to
cover the hole in the front cover.

FIG. 7 – TACHOMETER

CONNECTION DIAGRAM

TACHOMETER WIRES MUST BE CONNECTED SO THAT

TB3

–

T+

CORRECT POLARITY IS ACHIEVED WHEN TACH ROTATES

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 Fig. 8A p. 10)

2. Analog Input – An isolated 0 - 5 or 0 - 10 VDC 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 Fig. 14, p. 18, for signal isolator
wiring diagrams). Connect the isolated input voltage to terminal P2 (positive) and P1
(negative). (See Fig. 8B, p. 10) Note: Be sure jumper J7 corresponds to proper range
of input voltage 0 - 10 or 0 - 5 VDC. When the potentiometer is disconnected from P1,
P2, P3 to connect an analog input signal, the MIN trimpot will have to be adjusted
clockwise to achieve a 0

output voltage.