KB Electronics KBWD-15 - Manual (Page 5)

FIG. 3 – AC LINE AND
ARMATURE CONNECTION
4. Follow the National Electrical Code and other electrical codes that apply.
5. Connect control in accordance to AC line and armature connection. See fig. 3.
6. Ground (earth). The control should not be connected to ground (earth) since it does not contain a metal
chassis or enclosure. Attempting to ground control will cause catastrophic failure.
7. When using a step-down transformer (230 VAC to 115 VAC) be sure the VA rating of the transformer
is at least 3 times the VA rating of the motor .
TABLE 3 – TERMINAL BLOCK WIRING INFORMATION
Terminal Block
Designation
Connection
Designation
Supply Wire Gauge (AWG, Cu) Maximum Tightening
Torque (lb-in)
Minimum Maximum
TB1 L1, L2, A+, A- 22 12 7
TB2 F+, F- 22 14 5
TB3 I1, I2, P1, P2, P3 22 14 5
TB4 T+, T- 22 14 5
IV. WIRING. Warning! Read Safety Warning before attempting to use this control.
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.
A. AC Line – Connect AC line (115 VAC 50/60 Hz) to terminals L1 and
L2. It is recommended that a line fuse or circuit breaker be installed
with a 10 amp – 125 VAC rating.
B. Motor Armature – Connect motor armature to terminals A+ and A-.
Be sure motor voltage corresponds to control output voltage range
(90 – 130 VDC). It is recommended that a fuse be installed in series
with the armature; choose a fuse rating equal to the motor rating.
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C. Field – For Shunt Wound Motors Only. Do not use terminals F+ and F- for any purpose other than to
power the field on a shunt wound motor. Connect motor shunt field to terminals F+ and F- for 90VDC
motors with 100VDC fields. For motors with half voltage fields, 90VDC motors with 50VDC fields,
connect field to terminals F+ and L1. See table 4 for summary of field connections. See figures 4A and
4B for field wiring diagrams.
CAUTION – Shunt-Wound motors may be damaged if field remains powered without motor
rotating for an extended period of time.
FIG. 4A – FULL VOLTAGE FIELD FIG. 4B – HALF VOLTAGE FIELD
TABLE 4 – FIELD CONNECTIONS (Shunt Wound Motors Only)
AC Line Voltage (VAC) Motor Voltage (VDC) Field Voltage (VDC) Field Connection
115 90 100 F+, F-
115 90 50 F+, L1
D. Main Potentiometer – The control can be operated from a remote potentiometer, or from an isolated
analog voltage for voltage following.
i. 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, p. 9.)
ii. Analog Input – An isolated 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). Connect the isolated input voltage to terminal P2 (positive) and P1 (negative).
(See fig. 6 p. 9.)
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