General Information

- The KB Electronics KBMA-24DF AC Adjustable Frequency Drive is a variable speed control housed in a NEMA-1/ IP-40 enclosure

- Designed to operate 208 – 230 Volt 50 & 60 Hz 3-phase AC induction motors from 1/8 HP thru 1 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 make the drive suitable for soft-start applications

- KBMA-24DF contains a built-in AC line Class A RFI (EMI) filter which meets the CE Council Directive 89/336/EEC Industrial Requirement

- Its user-friendly design makes the KBMA-24DF easy to install and operate

Features
Standard

- Simple to Operate - Does not require programming. Uses trimpots and jumpers, which are factory set for most applications
- Motor Horsepower Selection Jumper - Allows the drive to be used on a wide range of motor horsepower (1/8, 1/4, 1/2, 3/4, 1 HP) without recalibration or programming
- Diagnostic LEDs - PC board mounted LEDs for Power On (ON), Drive Status (ST), and Overload (OL)
- Run/Fault Relay Output Contacts - Can be used to turn on or off equipment or to signal a warning if the drive is put into the Stop Mode or a fault has occurred
- Barrier Terminal Blocks - Facilitate wiring of AC line, motor, ground (earth), and Run/Fault Relay Output Contacts
- On/Off AC Line Switch - Panel mounted. Used to turn the power on or off to the drive
- Pilot Light - Panel mounted. Indicates that power is applied to the drive
- Main Speed Potentiometer - Panel mounted. Provides adjustment of motor speed.
- Jumper Selection of Drive Output Frequency - Increases the motor speed up to two times the rated RPM
- Compatible with GFCIs (with optional software)

Performance

- 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

Protection

- Motor Overload (I2t) with RMS Current Limit - Provides motor overload protection which prevents motor burnout and eliminates nuisance trips
- 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 bus overvoltage caused by rapid deceleration of high inertial loads
- Overvoltage and Undervoltage - Shuts down the drive if the AC line input voltage goes above or below the operating range
- MOV input transient suppression
- Microcontroller self monitoring and auto-reboot

Typical Applications

- Conveyors
- Packaging Equipment
- Blowers
- HVAC
- Door and Gate Openers
- Portable Equipment used with GFCI's

Technical Information
Specifications

- 115 Volt AC Line Input Voltage Operating Range (Volts AC) - 115(±15%)
- 208/230 Volt AC Line Input Voltage Operating Range (Volts AC) - 208(-15%) / 230(+15%)
- Maximum Load (% Current Overload for 1 Minute) - 150
- Horsepower Selection (HP) (J2) - 1/8, 1/4, 1/2, 3/4, 1
- Carrier, Switching Frequency (kHz) - 16, 8
- Output Frequency Resolution (Bits, Hz) - 10, .06
- Minimum Speed Trimpot (MIN) Range (% Frequency Setting) - 0–40
- Maximum Speed Trimpot (MAX) Range (% Frequency Setting) - 70–110
- Acceleration Trimpot (ACCEL) and Deceleration Trimpot (DECEL) Range (Seconds) - 0.3 – 20
- Slip Compensation Trimpot (COMP) Range at Drive Rating (Volts/Hz) - 0–3
- Current Limit Trimpot (CL) Range (% Full Load) - 0–200
- Motor Frequency Setting (Hz) (Jumper J5) - 50, 60
- Output Frequency Multiplier (1X, 2X) (Jumper J4) - 1, 2
- Minimum Operating Frequency at Motor (Hz) - 0.3
- Speed Range (Ratio) - 60:1
- Speed Regulation (30:1 Speed Range, 0 – Full Load) (% Base Speed) - 2.5
- Overload Protector Trip Time for Stalled Motor (Seconds) - 6
- Undervoltage/Overvoltage Trip Points for 115 Volt AC Line Input (±5%) (Volts AC) - 76–141
- Undervoltage/Overvoltage Trip Points for 208/230 Volt AC Line Input (±5%) (Volts AC) - 151–282
- Run/Fault Relay Output Contact Rating (Amps at 30 Volts DC, 125 Volts AC, 250 Volts AC) - 1, 0.5, 0.25
- Operating Temperature Range (°C / °F) - 0–45 / 32–113

Mechanical Specifications     Inches/mm



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Control Layout