KB Electronics KBWT-210 User Manual

INSTALLATION AND OPERATION INSTRUCTIONS

KBWT SERIES

These Installation and Operation Instructions

Cover Models KBWT-16, 26, 110, 112, 210

SAFETY WARNING, ON PAGE 7, MUST BE READ AND UNDERSTOOD BEFORE PROCEEDING!

1 DESCRIPTION

Thank you for purchasing the KBWT Series Pulse Width Modulated (PWM) Adjustable Speed DC Drive.
KB Electronics, Inc. is committed to providing total customer satisfaction by providing quality products that are
easy to install and operate.

Several models are available that provide the user a choice of input voltage and output current. The drives are
designed to operate Permanent Magnet (PM) DC motors rated 0.75 HP (0.5 kW) thru 2.2 HP (1.7 kW) continuous
duty and 1.5 HP (1.1 kW) thru 4.0 HP (3.0 kW) intermittent duty.

The drive provides excellent dynamic response to load variation. 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. PWM significantly lowers audible motor noise and provides longer brush life. It also produces less motor
heating, allowing a smaller and 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 and prevents control damage due to shorted motors.

A unique feature of the drive is its active bridge, which provides a substantial reduction in AC line surge current
each time the control is turned on. This prevents nuisance tripping of the circuit breaker and allows the control to
be turned on or off rapidly without damage to critical components. The drive also contains a built-in safety circuit
that will shut down the control if the main power transistor short circuits. This prevents high-speed runaway,
a potential problem with competitors’ controls.

The drive utilizes heat-spreader construction. This system provides an enhanced thermal path that eliminates
overtemperature cycles which cause premature failure of the power transistor. Other features of the drive are
Timed Current Limit (TCL) motor burnout protection (I x t), which will shut the control down if the motor is
overloaded for a predetermined time and the Potentiometer Safety Circuit™ (PSM), which prevents the control
from starting when the AC line is applied unless the signal input is reset to zero. Diagnostic LEDs for Power On
(PWR) and Overload (OL) indication are also provided. The drive contains barrier terminal blocks as standard or
quick-connect terminals for OEM applications. A 5 kΩ Main Speed Potentiometer (supplied), an isolated analog
input signal (0 – 5 Volts DC), or an isolated Pulse Width Modulated (PWM) signal from a microprocessor can be
used to control motor speed.

STANDARD FEATURES

• Short Circuit Protection: Pulse-by-pulse current sensing provides short circuit protection and prevents control

damage due to shorted motors.

• Timed Current Limit (TCL): Electronic Motor Burnout Protection (I x t) will trip the drive if an overload condition
persists for a predetermined time of 3 seconds (factory setting), 5 seconds, or 10 seconds.

• Status Indicator LEDs: Power On (PWR) and Overload (OL).

• Active Bridge: Provides controlled AC line inrush current limiting.

• Power Transistor Short Circuit Runaway Protection: Will shut down the control if the main power transistor

short circuits.

• Heat-Spreader: Eliminates overtemperature cycles which cause premature failure of the power transistor.

• Adjustable Trimpots: Current Limit (CL), IR Compensation (IR), Maximum Speed (MAX), Minimum Speed

(MIN), Acceleration (ACCEL), and Deceleration (DECEL).

• Potentiometer Safety Circuit: Prevents startup with the AC line unless the signal input is set to zero.

• Barrier Terminal Blocks: Facilitate wiring of the AC Line input, motor armature, motor field (shunt wound

motors only), and signal inputs.

• Quick-Connect Terminals: Used to connect an Inhibit switch or contact.

• Armature Fuse: Models KBWT-16, 26 contain a 10 Amp fuse, Models KBWT-110, 210 contain a 15 Amp fuse,

and Model KBWT-112 contains a 20 Amp fuse.

KBWT Series Installation and Operation Instructions (A40130) – Rev. B00 – 5/29/2013

RoHS

Page 1 of 7

GENERAL PERFORMANCE SPECIFICATIONS

Description Specification Factory Setting

Models KBWT-16, 110, 112 AC Line Input Operating Range (Volts AC, 50/60 Hz) 115 (± 15%) ──

Models KBWT-26, 210 AC Line Input Operating Range (Volts AC, 50/60 Hz) 208 (-15%) / 230 (+15%) ──

Speed Range (Ratio) 50:1 ──

Field Voltage for Models KBWT-16, 110, 112 (for Shunt Wound Motors Only) (Volts DC) 100 / 50 ──

Field Voltage for Models KBWT-26, 210 (for Shunt Wound Motors Only) (Volts DC) 200 / 100 ──

Operating Frequency (kHz) >16 ──

Form Factor (RMS/AVG Amps) <1.05 ──

AC Line Load Regulation (% Base Speed) 0.5 ──

Load Regulation (% Base Speed) 1* ──

Analog Input Voltage (Voltage Following) (Volts DC) 0 – 5 ──

Voltage Following Linearity (% Base Speed) ±5 ──

Main Speed Potentiometer (5 Watts) 5 kΩ ──

Fixed Timed Current Limit (I X t) (Seconds) 3, 5, 10 3

Current Limit (CL) Trimpot Range (% Full Load) 0 – 200 150

IR Compensation (IR) Trimpot Range at Full Load (Models KBWT-16, 26) (Volts DC) 0 – 15 6

IR Compensation (IR) Trimpot Range at Full Load (Models KBWT-110, 112, 210) (Volts DC) 0 – 15 3

Maximum Speed (MAX) Trimpot Range (% Base Speed) 50 – 100 100

Minimum Speed (MIN) Trimpot Range (% Base Speed) 0 – 30 0

Acceleration (ACCEL) Trimpot Range (Seconds) 0.2 – 12 2

Deceleration (DECEL) Trimpot Range (Seconds) 0.2 – 12 2

Operating Temperature Range (°C / °F) 0 – 40 / 32 – 104 ──

Operating Humidity Range (% Relative, Non-Condensing) 0 – 95 ──

Storage Temperature (°C / °F) -25 – +85 / -13 – +185 ──

*Based on a motor having linear IR compensation characteristics.

Maximum Horsepower

Continuous

Duty

Model No. Part No.

KBWT-16 8614 0.75 (0.5) 1.5 (1.1) 115 10 15 6.0 90 6.0 130 10.0

KBWT-26 8615 1.5 (1.1) 3.0 (2.0) 208/230 10 15 6.0 180 6.0 200 10.0

KBET-110 8603 1.2 (0.9) 2.0 (1.5) 115 15 20 10.0 90 8.5 130 15.0

KBWT-112 8612 1.5 (1.1) 2.5 (1.9) 115 18 25 12.0 90 10.5 130 20.0

KBWT-210 8610 2.2 (1.7) 4.0 (3.0) 208/230 15 20 10.0 180 8.5 200 15.0

HP (kW) HP (kW)

Intermittent

Duty

(1 Minute) Continuous Duty Rating

Volts AC

(50/60 Hz)

TABLE 1

TABLE 2

ELECTRICAL RATINGS

AC Line Input Output

Maximum

Current

(Amps RMS)

Fuse or

Circuit

Breaker

Rating

(Amps AC)

Amps DC Volts DC Amps DC Volts DC

Armature

Fuse

(Amps DC)

WARNING! This drive has been factory Hi-Pot tested. If you choose to perform another Hi-Pot test on the
drive, there is a risk that the drive can be damaged. Contact our Sales Department.

2 MOUNTING INSTRUCTIONS

The drive should be mounted on a flat surface and located in an area where it will not be exposed to
contaminants such as water, metal chips, solvents, or excessive vibration. When mounting the drive in an
enclosure, the enclosure should be large enough to allow proper heat dissipation so that the ambient temperature
does not exceed 40 °C (104 °F) at full rating. See Figure 1, on page 3.

KBWT Series Installation and Operation Instructions (A40130) – Rev. B00 – 5/29/2013

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MECHANICAL SPECIFICATIONS (INCH / mm)

FIGURE 1

7.00
178

6X Ø

6.50
165

0.25

6.35

0.19

4.83

1.125

28.6

1.325

33.7

2.00

50.8

7.00
178

0.305

7.75

F+ F− A+ A− L1 L2

6.50
165

I1I2

4.25
108

0.25

2X

6.35

5.00
127

V+ P1 P2 P3

TB3

0.445

11.3

7.00
178

6.50
165

0.25

2X

6.35

0.20

4X Ø

5.08

F+ F− A+ A− L1 L2

I1I2

4.25
108

6.75
171

V+ P1 P2 P3

1.25

2X

31.8

TB3

3.25

82.6

3 ELECTRICAL CONNECTIONS

See Figure 2 for the connections to the drive.

GENERAL CONNECTION DIAGRAM AND DRIVE LAYOUT

FIGURE 2

WARNING! HIGH VOLTAGE! The Safety Warning,
on page 7, must be read and understood before using
the drive. Disconnect the main power before making

F+ F− A+ A− L1 L2

connections to the drive. To avoid electric shock, be
sure to properly ground the drive.

3.1 AC Line Input and Ground: Connect the AC line input

to TB1 Terminals L1 and L2. Connect the chassis to earth
ground. Be sure the AC Line voltage corresponds to the drive
voltage rating, as shown in Table 2, on page 2.

3.2 AC Line Input Fusing: The drive does not contain AC
Line fuses. Most electrical codes require that each
ungrounded conductor contain circuit protection. Do not fuse
neutral or ground connections. It is recommended to install a
fuse (Littelfuse 326, Buss ABC, or equivalent) or a circuit
breaker (Square D QOU or equivalent) in series with each
ungrounded conductor. For the recommended fuse or circuit
breaker rating, see Table 2, on page 2.

3.3 Motor Armature: Connect the motor armature to TB1

I1I2

TB3

V+ P1 P2 P3

Terminals A+ and A-. Be sure the motor voltage corresponds
to the drive output voltage rating, as shown in Table 2, on
page 2.

3.4 Armature Fuse: Models KBWT-16, 26 contain a 10 Amp fuse, Models KBWT-110, 210 contain a 15 Amp
fuse, and Model KBWT-112 contains a 20 Amp fuse. The fuse should be rated 1.5 times the full load rating of
the motor. See Table 2, on page 2.

KBWT Series Installation and Operation Instructions (A40130) – Rev. B00 – 5/29/2013

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