Overview
The KB Electronics KBSI-240D signal isolator (model 9431C) provides galvanic isolation between non-isolated signal sources and KB motor speed controls. The Model KBSI-240D Signal Isolator provides an isolated interface between non-isolated signals and KB motor speed controls. This compact control module accepts a wide range of analog input signals and delivers a linear 0–10V DC output suitable for controlling motor speed drives, frequency inverters, and process control systems.
Key Features
- A single model accepts a wide range of voltage (0-25, 0-120 and 0-550VDC) and current (1-5, 4-20 and 10-50mA) signals, multi-turn trimpots are provided for Min and Max.
- The maximum output voltage of the KBSI is 10 volts, which is a linear function of the input.
- A built-in power supply enables the KBSI-240D to be controlled with a 5KΩ remote potentiometer.
- Signal sources include process controllers, transducers, microprocessors and programmable controllers.
- Compact footprint with 4-hole mounting pattern for easy integration into control panels.
Technical Specifications
- Input Voltage Ranges: 0–25V DC, 0–120V DC, 0–550V DC
- Input Current Ranges: 1–5mA, 4–20mA, 10–50mA
- Output Voltage: 0–10V DC maximum, linear transfer
- Output Current: 10mA maximum
- The KBSI can be operated from either 115V or 230VAC 50/60Hz.
- AC Power Requirements: 115 or 208 – 230V AC, 50/60 Hz
- Dimensions: 2.7″ x 4.8″ x 1.1″.
- Weight: 0.45 lbs
- Mounting: Four 6–32 screw holes, any orientation
- Certifications: This product complies with all CE directives pertinent at the time of manufacture.
Typical Applications
- Motor speed control with isolated analog feedback from tachometers or speed transducers
- Process control signal conditioning for DC drive systems
- Isolation of weak analog control signals in high-noise industrial environments
- Potentiometer-based speed reference with automatic/manual switchover
- Multi-motor synchronization and follower-motor speed tracking
- OEM machine tool control (spindle speed, conveyor speed, pump control)
Compatibility & Replacements
Compatible With
- KB Electronics DC drives (KBMM, KBIC, KBCC, KBPB, KBPC, KBRG, KBWD series)
- Process controllers and programmable logic controllers (PLCs) with 0–10V analog outputs
- Analog transducers (pressure, temperature, flow, speed tachometers)
- Remote 5kΩ potentiometers for manual speed control
- 115V and 230V AC single-phase power circuits
Replaces / Drop-In Replacement For
- Older KB Electronics KBSI isolator models where signal conditioning or isolation is required
- Verify specific control loop compatibility with KB Electronics technical support or your system integrator before ordering.
Works With
- Analog control signal sources (0–25V, 0–120V, 0–550V DC and 4–20mA current loops)
- KB motor speed controllers and DC armature voltage regulators
- Industrial automation systems requiring galvanic signal isolation
- Floating or grounded input signals
