KBAC SERIES INSTALLATION AND OPERATION MANUAL
6
4 – INTRODUCTION
Thank you for purchasing the KBAC Adjustable Frequency Drive. KB Electronics, Inc. is committed to providing total customer satisfaction by
producing quality products that are easy to install and operate. The KBAC is manufactured with surface mount components incorporating
advanced circuitry and technology.
The drives are variable speed controls housed in a rugged NEMA 4X / IP65 washdown and watertight die-cast aluminum enclosure. They are
designed to operate 208 – 230 and 400/460 Volt 50 & 60 Hz 3-phase AC induction motors from subfractional thru 10 HP. The sine wave
coded Pulse Width Modulated (PWM) output operates at a carrier frequency of 16 kHz which provides high motor efficiency and low noise.
Adjustable Linear Acceleration and Deceleration are provided, making the drive suitable for
soft-start applications.
Due to its user-friendly design, the KBAC AC drive is easy to install and operate. Tailoring to specific applications is accomplished with
selectable jumpers and trimpots, which eliminate the computer-like programming required on other drives. However, for most applications no
adjustments are necessary.
Main features include adjustable RMS Current Limit and I
2
t Motor Overload Protection (UL approved as an electronic overload protector for
motors). In addition, Adjustable Slip Compensation with Static Auto-Tune and Boost provides high torque and excellent load regulation over a
wide speed range. Power Start™ delivers over 200% motor torque to ensure start-up of high frictional loads. Electronic Inrush Current Limit
(EICL™) eliminates harmful AC Line inrush current. A Run/Fault Relay is provided, which can be used to turn equipment on or off, to signal a
warning if the drive is put into the Stop Mode, or if a fault has occurred. The drive is suitable for machine or variable torque (HVAC)
applications. Also, a jumper is provided for selection of Regenerative or DC Injection Braking.
Standard front panel features include Diagnostic LEDs for "Power On" and "Drive Status", a Start/Stop Switch, and a Main Speed
Potentiometer. Other features include a Barrier Terminal Block to facilitate wiring of the AC Line and motor, adjustable trimpots (MIN, MAX,
ACCEL, DECEL, COMP, CL, JOG, BOOST), customer selectable jumpers (Line Voltage (dual voltage models only)), Motor Horsepower,
Automatic Ride-Through / Manual Start, Motor Frequency, Frequency Multiplier, Fixed/Adjustable Boost, Regenerative / Injection Braking,
"Run" or "Fault" Output Relay Operation, NO/NC Stop Contact, Constant/Variable Torque, Switching Frequency, and GFCI operation
(Third Generation (3G) drives only).
Optional accessories include: Forward-Stop-Reverse Switch, On/Off AC Line Switch, Run-Stop-Jog Switch, Signal Isolator, Auto/Manual
Switch, Class A AC Line Filter, Multi-Speed Board, and Liquidtight Fittings. A connector is provided for easy installation of accessories.
Custom software: all models can be factory programmed for applications which require special timing, PLC functions, and GFCI operation.
4.1 – STANDARD FEATURES
Industrial Duty Die-Cast Aluminum Case with Hinged Cover:
Available in dark gray finish or FDA approved white finish.
Simple to Operate:
Does not require programming. Uses trimpots and jumpers, which are factory set for most applications.
Motor HP Selection Jumper (J2): Allows the drive to be used on a wide range of motors without recalibration.
Switching Frequency and GFCI Selection Jumper (J12):
Allows the drive to be operated at 8 kHz or 12 kHz and on Standard (G1) or
Sensitive (G2) GFCIs. (Third Generation (3G) drives only.)
Diagnostic LEDs:
Power on (POWER) and drive status (STATUS).
Run/Fault Relay Output Contacts:
Can be used to turn equipment on or off, to signal a warning if the drive is put into the Stop Mode, or a
fault has occurred.
Start/Stop Switch:
Provides electronic start and stop functions.
Barrier Terminal Block:
Facilitates wiring of motor, AC Line, and Run/Fault Relay Output Contacts.
Jumper Selection of Drive Output Frequency:
Increases the motor speed up to two times the rated RPM.
Ride-Through:
Provides smooth recovery to the previous set speed during a momentary power loss (of less than 2 seconds).
Holding Torque at Zero Speed:
Resists motor shaft rotation when the drive is in Stop Mode.
Adjustable Trimpots:
Maximum Speed (MAX), Minimum Speed (MIN), Acceleration (ACCEL), Deceleration (DECEL), DC Injection Brake
(DECEL), Boost (BOOST), Current Limit (CL), Jog (JOG), Slip Compensation (COMP).
Selectable Jumpers:
AC Line Input Voltage (J1 – KBAC-24D, 27D only), Motor Horsepower (J2), Automatic Ride-Through or Manual Start
(J3), Frequency Multiplier (J4), Motor Frequency (J5), Fixed or Adjustable Boost (J6), Regeneration or DC Injection Braking (J7), "Run" or
"Fault" Output Relay Operation (J8), Normally Open or Closed Stop Contact (J9), Constant or Variable Torque (J10), Switching Frequency
and GFCI (J12 – Third Generation (3G) drives only).
4.2 – PEERFORMANCE FEATURES
Power Start™:
Provides more than 200% starting torque which ensures startup of high frictional loads.
Slip Compensation with Static Auto-Tune and Boost:
Provides excellent load regulation over a wide speed range.
Speed Range:
60:1.
4.3 – PROTECTION FEATURES
Motor Overload (I
2
t) with RMS Current Limit:
Provides motor overload protection which prevents motor burnout and eliminates nuisance
trips. UL approved as an electronic overload protector for motors.
Electronic Inrush Current Limit (EICL™):
Eliminates harmful Inrush AC Line current during startup.
Short Circuit:
Shuts down the drive if a short circuit occurs at the motor (phase-to-phase).
Regeneration:
Eliminates tripping due to high bus voltage caused by rapid deceleration of high inertial loads.
Undervoltage and Overvoltage:
Shuts down the drive if the AC Line input voltage goes above or below the operating range.
MOV Input Transient Suppression:
Protects the drive components against damaging voltage spikes on the AC Line.
Microcontroller Self-Monitoring and Auto Reboot.
