KB Electronics KBWD-15 - Manual (Page 2)

FACTORY SETTING OF TRIMPOTS
i. SIMPLIFIED SETUP AND OPERATING INSTRUCTIONS
IMPORTANT – You must read these simplified operating instructions before you proceed.
1. Be sure AC line voltage is 115 VAC 50/60 Hz.
2. Install the correct Plug-in Horsepower Resistor ® according to motor current and/or horsepower.
Note: Disregard the horsepower rating marked on the
Plug-in Horsepower Resistor ® since they are marked
for SCR controls. See table 2, page 5.
3. Recheck connections: AC line to L1 and L2; armature to A+
and A- (use F+ and F- for shunt motor field connections only.)
Note: If motor runs in improper direction, interchange
armature leads.
4. Nominal factory trimpot settings are as follows: (Expressed in % of full CW rotation).
ii. SAFETY WARNING! — PLEASE READ CAREFULLY
This product should be installed and serviced by a qualified technician, electrician or electrical maintenance
person familiar with its operation and the hazards involved. Proper installation, which includes wiring, mounting in
proper enclosure, fusing or other overcurrent protection and grounding, can reduce the chance of electric shocks,
fires or explosion in this product or products used with this product, such as electric motors, switches, coils, solenoids
or relays. Eye protection must be worn and insulated adjustment tools must be used when working with control under
power. This product is constructed of materials (plastics, metals, carbon, silicon, etc.) which may be a potential
hazard. Proper shielding, grounding and filtering of this product can reduce the emission of radio frequency
interference (RFI) which may adversely affect sensitive electronic equipment. If information is required on this
product, contact our factory. It is the responsibility of the equipment manufacturer and individual installer to supply
this safety warning to the ultimate user of this product. (SW effective 11/92)
This control may contain electronic Start/Stop and Enable circuits that can be used to start and stop the control.
However, these circuits are never to be used as safety disconnects since they are not fail-safe. Use only the AC line
for this purpose.
The input circuits of this control (tachometer, start/stop, inhibit, enable) are not isolated from AC line. Be sure
to follow all instructions carefully. Fire and/or electrocution can result due to improper use of this product.
See Application Note Warning on page 2.
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This product complies with all CE directives pertinent at the time of manufacture. Contact factory
for detailed installation instructions and Declaration of Conformity. Installation of a CE approved
RFI filter (KBRF-200A, KB P/N 9945C or equivalent) is required. Additional shielded motor cable and/or
AC line cables may be required along with a signal isolator (KBSI-240D, KB P/N 9431 or equivalent).
iii. APPLICATION NOTE: WARNING!
1. PWM controls are designed with a single power transistor which is wired directly in series with
the motor. If for some reason this transistor short circuits, a "runaway" condition could occur
where the motor will almost instantaneously accelerate to full speed. This could cause physical
harm to an operator or user of the machinery or equipment on which the control is installed. In
some cases a proper sized fuse, when installed in series with the motor armature, will prevent
this "runaway" condition. Use extreme caution when applying PWM controls to certain
applications.
2. PWM controls emit substantial levels of radio frequency interference (RFI) compared to SCR
controls. The KBWD contains a built-in RFI filter which suppresses most of the RFI that would
normally be conducted and radiated via the AC line. However, some RFI can still be radiated and
conducted from the control and through the motor wires. Shielded cables and other means of
reducing the effect of RFI may have to be employed for some applications.
3. This control contains inhibit, enable and other circuits that can be used to turn the control "on"
and "off." Do not use these circuits as a safety disconnect. Use only the AC line for that purpose.
I. GENERAL INFORMATION
The KBWD-15 Pulse Width Modulated (PWM) DC motor speed control provides excellent dynamic response
to load variations. The efficient PWM waveform produces an almost pure DC current to the motor (form
factor < 1.05) which has several advantages over a conventional SCR control. The PWM significantly lowers
audible motor noise and provides longer brush life. It also produces less motor heating which allows a
smaller, less costly motor to be used for most applications. Another advantage of PWM is higher output
voltage which provides increased output speed. In addition, pulse-by-pulse current sensing provides short
circuit protection.
A unique feature of the KBWD-15 control is the Plug-in Horsepower Resistor
® . It eliminates the need for
recalibrating IR Comp and Current Limit when the control is used on various horsepower motors. The control
is factory set for armature feedback which provides excellent load regulation. For applications that require
superior performance, tachometer feedback is also provided. The KBWD-15 contains (I x t) overload
protection which will shut the control down if the motor is overloaded for a predetermined time. Diagnostic
LEDs for "Power On" and "Overload” (CL) indication are also provided.
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