ABB 3BHE021951R0124 KV C758 A124 Control Board

The ABB 3BHE021951R0124 KVC758A124 Control Board is a control / interface subprint of ABB’s medium-voltage drive and excitation systems, documented as an isolated dual-voltage sub-board (signal conditioning + isolated power in one). It performs signal acquisition, I/O interfacing, and real-time communication between the drive’s control logic and power electronics — applied in ABB ACS5000-series water-cooled medium-voltage drives and compatible with ACS800 / ACS880 drive cabinets.

Key Features

• Control / interface board for ABB medium-voltage drive and excitation systems
• Isolated dual-voltage sub-board (“IPS” type): signal conditioning + isolated power supply combined
• 24 V DC input; dual isolated ±15 V / +5 V outputs (per service data)
• Signal acquisition, I/O interfacing, and real-time communication between control logic and power stage
• Used as a spare part for ABB ACS5000-series water-cooled MV drives; compatible with ACS800 / ACS880 cabinets
• Galvanic isolation between input and output (approx. 2.5 kV optical isolation per service data)
• Swedish-made (ABB)

Technical Specifications

• Type Designation: KVC758A124
• Order Code: 3BHE021951R0124
• Product Type: Control board — isolated dual-voltage sub-print (signal conditioning + isolated supply)
• System: ABB ACS5000 series water-cooled medium-voltage drives; compatible with ACS800 / ACS880 cabinets
• Input Voltage: 24 V DC (±10%…±20% per source)
• Outputs: Dual isolated ±15 V / +5 V rails (per service data)
• Isolation: Galvanic isolation between channels and input-output (approx. 2.5 kV optical isolation; port isolation 520 V DC per service data)
• Power Consumption: ≤ 20 W typical (service data)
• Function: Signal acquisition, I/O interfacing, real-time communication between drive control logic and power electronics
• Origin: Sweden (ABB)

Installation Notes

1. De-energize the drive cabinet and discharge DC-link capacitors before handling the board — MV drive power sections hold lethal voltages.
2. Install the KVC758A124 in its designated slot in the ACS5000 (or compatible ACS800/ACS880) cabinet; seat the backplane connector fully.
3. Verify the 24 V DC control supply is within tolerance before power-up.
4. Check the isolated output rails and isolation integrity per the drive service manual during commissioning.
5. Confirm the board revision/order code (3BHE021951R0124) against the drive’s parts list before installation.

Common Questions

What is the KVC758A124? It is an ABB control / interface sub-board combining signal conditioning and isolated power supply (“isolated dual-voltage sub-print”), used in ABB medium-voltage drive and excitation control applications.

Which drives use this board? It is documented as a spare part for ABB ACS5000-series water-cooled medium-voltage drives, with compatibility cited for ACS800 and ACS880 drive cabinets.

What voltage does it need? 24 V DC input; the board provides isolated dual ±15 V / +5 V outputs (per service data).

Is this the same as the UNITROL 6000 board? Some listings associate KVC758A124 with the UNITROL 6000 excitation system; the primary documentation identifies it with ACS5000-series MV drives. Confirm the intended application against your system’s parts list before ordering.