ABB DSSB 145 Control Unit

The ABB 68300746 (designated as the DSSB-01C or DSSB 145 hardware profile) operates as the primary main control board and user interface unit for Diode Supply Units (DSU) within high-power variable frequency drive architectures, such as the ABB ACS 600 MultiDrive and ACS/ACC 607 series. Positioned structurally outside the core power modules, this control unit handles localized signal format processing, logic routing, and communication management between incoming supply parameters and the drive's overarching processing layers.

Hardware Specifications

System Integration and Communication Flow

The 68300746 Control Unit processes localized system field variables to maintain continuous diagnostic tracking across the drive's three-phase incoming power section. The unit maps physical field sensor inputs, tracking line voltage variations ($\pm 10\%$ deviation allowances) and line frequencies running between 45–65 Hz.

Power and internal ground routing are fed into the board via a flat ribbon cable arrangement running from the DSMB (Supply Management Board) through an intermediate DSCP connection node. This parallel processing design allows the drive to compute dynamic acceleration/deceleration steps, enforce motion-rate limits, and translate field data into predictable digital packets without overloading the primary inverter control loop.

Frequently Asked Questions

Q: Where does the DSSB-01C control board draw its operational logic power from?

A: The board does not connect directly to high-voltage AC mains. It receives its regulated power supply and logic grounding from an internal ribbon cable bus linked to the DSMB board via the DSCP interface board.

Q: What happens to the drive line if the 68300746 board experiences an online power drop or communication fault?

A: Because the board controls the Diode Supply Unit (DSU), any communication drop or board level fault immediately breaks the safety interlocking loop. This causes the main line contactor to trip, safely isolating the DC bus and preventing phase imbalances or uncontrolled current surges down the line.