KB Electronics KBPI-240DR - Manual (Page 13)

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FIG. 5 – REMOTE POTENTIOMETER
CONNECTION
FIG. 6 – ANALOG VOLTAGE
CONNECTION
C. 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. Do not connect
ground wire to any other terminals on
control.
D. 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 seal is used to cover the
hole in the front cover. Note: Use
shielded cable on all connections to P1,
P2, or P3 over 12" (30cm) in length. Do
not ground shield.
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. 5.)
2. Analog Input. An isolated 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 (KB P/N 9431) should be used. Connect the isolated input voltage to
terminal P2 (positive) and P1 (negative). (See fig. 6.) Adjust the MIN trimpot clockwise
to achieve a 0
+ output voltage.
VI. FUSING.
A. AC Line Fusing – Most electrical codes require that each ungrounded conductor contain
fusing. Separate branch circuit fusing or circuit breaker may be required. Check all
electrical codes that may apply to the installation. This control does not contain AC line
fuses. A 20 amp rated fuse or circuit breaker can be used.
B. Armature Fusing – The control contains a built in armature fuse holder. An armature
fuse rated 1.5 times higher than the full load of the motor, must be installed before
operating the control. This fuse should not blow unless the motor is shorted or another
catastrophic failure occurs. An armature fuse replacement such as Littelfuse 326 or Buss
ABC ceramic fuse or equivalent can be used. Fuse supplied separately from your
distributor. See table 7 for armature fuse chart.
TABLE 7 – ARMATURE FUSE CHART
Motor Horsepower
Approx. DC Motor
Current Amps
Fuse Rating
(AC Amps)
90VDC 180VDC
1/6 1/3 1.7 2
1/4 1/2 2.5 4
1/3 3/4 3.3 5
1/2 1 5.0 8
3/4 1 7.5 12
1 2 10.0 20
Note: Armature fuse is not supplied and must be installed for control to operate.