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ABB DSMB-02C (64666606) is a control board used in the ABB ACS800-304/704 diode supply unit (DSU) assembly. It provides gate-control signals to the associated thyristor/diode power modules through dedicated cable connections. The board is part of the supply-unit control hardware and works alongside other components in the DSU assembly.
The DSMB-02C is identified by ABB as a control board and is listed as a component of the ACS800DSUV3 kit. Its connections also interface with associated supply-unit circuitry, including auxiliary power and charging-control signals linked to the DSMB-01C board. The documented net weight is 0.3 kg. For replacement planning, confirm the complete part number, installed DSU configuration, board revision, fuse arrangement, and cable connections before selecting or installing a replacement.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | DSMB-02C |
| Product ID | 64666606 |
| Common extended part number | 3AFE64666606 |
| Product type | Control board |
| Associated drive family | ABB ACS800 |
| Documented equipment | ACS800-304/704 diode supply units |
| Related assembly | ACS800DSUV3 kit |
| Primary function | Gate control for thyristor/diode power modules |
| Related control hardware | DSMB-01C power supply board |
| Net weight | 0.3 kg |
ABB Advant OCS Product Guide
Detailed Product Overview
Role in the ABB ACS800 Diode Supply Unit
The ABB DSMB-02C is a control board installed in the supply-unit assembly of the documented ACS800-304/704 drive configurations. Its primary role is to provide the gate-control signals used by the associated thyristor/diode power modules.
These semiconductor modules form part of the DSU power-conversion hardware. The DSMB-02C connects to them through dedicated gate-control cables, making the board and its associated wiring important elements of the supply-unit control arrangement.
Gate-Control Connections and Power Electronics
The DSMB-02C uses dedicated connectors to interface with the thyristor/diode modules. The associated maintenance documentation identifies six gate-control cables connecting the board to the power modules. Correct cable placement and connector seating are therefore important when the assembly is serviced.
The board also contains rectifier diode circuitry that can be checked during troubleshooting. These circuits are distinct from the main power stage and blower-inverter circuitry associated with the DSMB-01C. Understanding this distinction helps maintenance personnel identify the correct board and follow the relevant diagnostic procedure.
ABB Advant OCS Product Guide
ABB Advant OCS Product Guide
Automatic voltage control
Mvar control
The Mvar control mode is set automatically if the AVR fails. The voltage can be adjusted from central point of control by using the voltage up/down keys.
PF control
In the PF control mode the voltage/PF can be adjusted from central point of control by using the voltage up/down keys or by inserting a new value. The output setpoint is slowly changed to the new value. If the generator can not follow the setpoint, an audible alarm is created.
The output setpoint will be switched back to the actual value, and the program will try to reach the setpoint again. Reasons for not reaching the setpoint can be the excitor limits, or the generator is not connected with PPC or another generator, etc.
PF demand control
The PF demand control mode can only be activated if the generator is already in the PF control mode. The PF setpoint is now issued by the “Reactive Power Control” function, see also chapter 5.2. Before using this setpoint, the value must be valid. If the value is not valid within 10 minutes, an audible alarm is created.
An audible alarm is created and the AVR will return into the PF control mode if:
- the PF setpoint value is not valid within 10 minutes
- communication loss with the “Reactive Power Control”
The output setpoint into the PF demand control mode acts the same as in PF control mode.
