/Products/VFD's & Soft Starters/KB Electronics/KBBC/9500 KB Electronics Battery DC/DC Variable Speed Control, 40 Amp 12/24VDC
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Product ID: KB9500

9500 KB Electronics Battery DC/DC Variable Speed Control, 40 Amp 12/24VDC

MFG: KB Electronics, Inc
MFG Part Number: 9500

Available Stock: 2
Selected accessories will also be added to cart
$303.91 / Each
KBBC-24M, Microprocessor Controlled, PM & Series Wound DC Motors


The KBBC series of battery powered variable speed controls are designed for 12, 24, 36, and 48 Volt PM and Series Wound DC motors. Microcontroller design provides superior performance and ease of tailoring to specific applications. Operating in a regenerative mode, precise and efficient control is obtained using stateof- the-art MOSFET technology. The KBBC operates at a switching frequency of 16 kHz, which provides high motor efficiency and quiet operation.

The KBBC contains many standard features such as current limit, short circuit protection, speed potentiometer fault detector, overtemperature sensing, and undervoltage/overvoltage protection. A variety of trimpots are provided, which can be used to tailor the control to exact specifications. The control also contains LEDs that indicate “power on” and “status.” A DC power contactor allows a low power switch to turn the control on and off. Reversing contactors provide arcless forward, stop, and reverse operation. In addition, a brake driver circuit is used to power an optional electromagnetic brake.

The KBBC can be controlled in several ways, such as single ended or wigwag speed potentiometer and 0 - 5 Volts DC signal following. The controls contain a built-in heat sink that also serves as a mounting base.

Typical Applications

  • Scooters
  • Personnel Carriers
  • Carts
  • Electric Boats
  • Portable Pumps
  • Lifts
  • Floor Polishers

Standard Features

High Frequency PWM Operation: Reduces motor noise and increases efficiency.

Controlled Acceleration and Deceleration: Provides timed acceleration to set speed and deceleration to zero speed.

Diagnostic LEDs: Provide indication of power on (PWR ON) and control status (STATUS).

Built-In Reversing Contactor: Provides forward/reverse operation with a low power reversing switch or with a center-off throttle potentiometer (wigwag).

Run Relay: Used to turn on or off equipment or signal a warning if a fault has occurred.

Brake Driver Circuit: Powers an optional electromechanical brake (current regulated and short circuit protected).

Key Switch Operation with Built-In Battery Power Contactor: Allows the use of a low power switch to turn control on and off.

Inhibit Circuit: Allows control to be turned off electronically with a separate low power switch.

Latching Circuit: Allows momentary switches to start, stop, and reverse the control.

Limit Switch Circuit (Stop Forward and Stop Reverse): Allows limit switches to be used to immediately stop the control in forward or reverse directions.

Single-Ended or Wigwag Potentiometer Control: Allows the Main Speed Potentiometer to be used as single-ended (zero speed is at 0% rotation) or wigwag (zero speed is at 50% rotation).

Protective & Safety Features

Electronic Current Limit: Protects the motor and control against overload.

Polarity Protected: Prevents control damage if the battery is wired incorrectly.

Short Circuit Protected: Protects main power transistor from failure due to a short at the motor.

Overtemperature Protection: Reduces control output as the transistors reach maximum operating temperature.

Overvoltage Protection: Will turn off the control if the battery voltage exceeds 125% of nominal.

Undervoltage Protection: Will turn off the control if battery voltage reduces below 65% of nominal.

Potentiometer Fault Circuit: Turns the control off if a short, open, or ground occurs at the potentiometer.

High Pedal Disable Function: Prevents control startup until the potentiometer returns to zero.

Trimpot Adjustments

Timed Brake Delay (T-BRK): Sets the delay time before the brake is engaged.

Current Limit (CL): Sets the current limit (overload), which limits the maximum current to the motor.

IR Compensation (IR): Sets the amount of compensating voltage required to keep the motor speed constant under changing loads.

Deceleration (DECEL): Sets the amount of time for the motor to decelerate from the set speed to zero speed.

Acceleration (ACCEL): Sets the amount of time for the motor to accelerate from zero speed to the set speed.

Minimum Speed (MIN): Sets the minimum motor speed.

Reverse Maximum Speed (RMAX): Sets the maximum motor speed in the reverse direction (a % of FMAX setting).

Forward Maximum Speed (FMAX): Sets the maximum motor speed in the forward direction.

General Performance Specifications

Parameter Range Factory Setting
Input Voltage Range (% Nominal) 75 - 125 100
Intermittent Duty Operation 2 Minutes -
Peak Duty Operation 7 Seconds -
Overvoltage Shutdown (% Nominal Input Voltage) 125 -
Undervoltage Warning (% Nominal Input Voltage, ? 10%) 85 -
Undervoltage Shutdown (% Nominal Input Voltage) 65 -
Nominal Carrier Frequency 16 kHz -
Electromagnetic Brake Delay Trimpot (T-BRK) Range 0.2-2.5 Seconds 1 Second
CL Trimpot (CL) Range (% Range Setting) 0 - 200 150
IR Compensation Trimpot (IR) Range (% Nominal Battery Voltage) 0 - 25 4
Acceleration Trimpot (ACCEL) Range (% Base Speed) 0.1 - 15 2
Deceleration Trimpot (DECEL) Range (% Base Speed) 0.1 - 15 2
Minimum Trimpot (MIN) Range (% Base Speed) 0 - 30 0
Forward Maximum Speed Trimpot (FMAX) Range (% Base Speed)* 60 - 100 100
Reverse Maximum Speed Trimpot (RMAX) Range (% Forward Maximum Speed) 50 - 100 100/th>
Electromagnetic Brake Current Rating 1 Amp -
Heat Sink Overtemperature Protection Point 100°C -
Deadband in Wigwag Throttle Mode +/- 0.3 -
Wigwag Throttle Signal Input Voltage for Maximum Forward 2.5 – 5.00 VDC 5 VDC
Wigwag Throttle Signal Input Voltage for Neutral 1.2 – 2.5 VDC 2.5 VDC
Wigwag Throttle Signal Input Voltage for Maximum Reverse 0 VDC 0 VDC
Single Ended Throttle Signal Range for Full Speed Forward or Reverse 0 – 2.5 to 5.0 VDC 0 – 5 VDC
Timed Current Limit (TCL) Trip Time 7 Seconds -
Run Relay Output Contact Rating 1 Amp @ 30VDC
0.5 Amp @ 125VAC
Auxiliary Power Connector (P2) Rating 10 Amps Max -
Operating Temperature Range 0 to 40°C

Electrical Ratings

Manufacturer KB Electronics
Model Number KBBC-24M
Part Number 9500
Revision G
UPC 024822095006
Continuous Duty Intermittent Duty
(2 Minute Rating)
Peak Duty
(7 Second Rating)
12 VDC 0 - 12 VDC 1/2HP Max
40 Amps
3/4HP Max
60 Amps
1HP Max
80 Amps
24 VDC 0 - 24 VDC 1HP Max
40 Amps
1.5HP Max
60 Amps
2HP Max
80 Amps

Jumper Selectable Features

JA - Battery Voltage (VOLTAGE – 12/24): Selects nominal battery voltage.

JB - Motor Current (CURRENT – 10A/20A/30A/40A): Selects nominal motor current.

J1 - Signal Type (SIG – VF/POT): Selects voltage following or potentiometer operation.

J2 - Speed Potentiometer Mode (SPD – SE/WW): Selects single-ended or wigwag speed control.

J3 - Current Limit Mode (TCL – NTCL/TCL): Selects non-timed current limit or timed current limit.

J4 - High Pedal Mode (HPD – NHPD/HPD): Selects non-high pedal disable or high pedal disable.

J5 - Deceleration Mode (STP – DEC/FIX): Selects adjustable or fixed (0.1 second) deceleration when a stop command is given.

J6 - Direction Switch Type (LATCH – OFF/ON): Selects maintained or momentary direction commands.

J7 - Cycling Mode (CYCL – OFF/ON): Selects cycling of relay which is used to brake the motor.

J8 - Relay Output Contacts (RLY – NO/NC): Selects normally open or normally closed Run Relay contacts.