KB Electronics KBRC-240D - Manual (Page 10)

Warning! Do not wire switches or relays in series with the armature. Armature switch-
ing can cause catastrophic failure of motor and/or control. To avoid erratic operation,
do not bundle AC line and motor wires with potentiometer wires, voltage following wires,
Start/Stop Switch wires, enable wires, or any other signal wires. Use shielded cables on all
signal wiring over 12” (30cm) long. The shield should be earth grounded on the control side
only.
The KBRC-240D is designed with a hinged case so that when the front cover is open, all
wiring stays intact. To open the cover, the four screws must be loosened so they are no
longer engaged in the case bottom. After mounting and wiring, close the cover and make
sure that wires will not get caught or crimped as the cover is closed. Tighten all four cover
screws so that the gasket is slightly com-
pressed. Do not over tighten.
A. AC Line Connection – Wire the AC
line to L1 and L2 terminals of
Terminal Block TB1, as shown in
Figure 4.
B. Ground Connection – Earth ground
the control chassis using the green
ground screw that is provided on the
inside of the control to the right side
of Terminal Block TB1, as shown in
Figure 4.
C. Permanent Magnet (PM)
Motor Connection – Wire the
motor armature leads to M1 and
M2 terminals of Terminal Block
TB1, as shown in Figure 4. Be
sure Jumper J3 is set to the cor-
responding motor voltage and
Jumper J4 is set to the corre-
sponding motor current.
For step-down operation (230
Volt AC line input with 90 Volt
DC SCR rated motors) set
Jumper J3 to the “90V” position.
However, in step-down opera-
tion the motor may have
reduced brush life - consult
motor manufacturer. Note: If
the motor runs in the opposite
direction than is desired, dis-
connect power and reverse the
motor leads.
Note: Do not connect motor
armature leads to F+ and F- ter-
minals of Terminal Block TB2 or
to F1 and F2 quick-connect ter-
minals. Do not use F1 and F2
quick-connect terminals for any
purpose other than to power the
optional Signal Isolator SIRC
(P/N 8842).
D. Full Voltage Field Connection (Shunt Wound Motors Only) – Wire the motor field
leads to F+ and F- terminals of Terminal Block TB2, as shown in Figure 5 and as
described in Table 4, on page 11.
10
!
(EARTH)
GROUND
TB1
M1 L1 M2 L2
TB2
F+ F-
AC LINE
M
+
-
MOTOR
FIGURE 4 – POWER CONNECTIONS
L2
TB1
M2 M1 L1
(EARTH)
GROUND
TB2
F- F+
+
AC LINE
-
M
MOTOR
+
FIELD
-
(SHUNT MOTORS
ONLY)
FIGURE 5 – FULL VOLTAGE FIELD CONNECTION
(Shunt Wound Motors Only)
FIELD
(SHUNT MOTORS
ONLY)
L2
TB1
M2 M1 L1
(EARTH)
GROUND
TB2
F- F+
+
AC LINE
-
M
MOTOR
+
-
FIGURE 6 – HALF VOLTAGE FIELD CONNECTION
(Shunt Wound Motors Only)