Centrifuge control system with power loss ride through
AssigneeABB AB
InventorBernard Rafferty
Life of this patent
Estimating the term…
Abstract
A control system for a centrifuge that allows the centrifuge to continue to run when there is a short duration failure or outage of the AC power source. The control system allows the centrifuge to be brought to a stop in a normal shutdown mode where there are longer duration failures or outages of the AC power source. This allows power to be maintained to the pump that lubricates the centrifuge bearings so that the bearings are lubricated during the coast down of the centrifuge and the differential speed of the centrifuge to be controlled during coast down allowing the centrifuge bowl to be cleared of solids so that the centrifuge can be immediately started up at lower vibration levels once power is restored.
Claims15
A control system for a decanter centrifuge, said decanter centrifuge when rotating having kinetic energy, said control system comprising:
- (a) a variable frequency drive receiving power from an AC source and connected to a main drive motor, said main drive motor for rotating a bowl of said decanter centrifuge;
- (b) a variable frequency drive connected to a back drive motor, said back drive motor for rotating a conveyor of said decanter centrifuge;
- (c) a common DC bus connected to said variable frequency drive connected to said main drive motor and to said variable frequency drive connected to said back drive motor;
- (d) means connected to said common DC bus and a stand for providing lubrication to said decanter centrifuge for controlling said lubrication stand;
- said decanter centrifuge kinetic energy providing through said variable frequency drive connected to said main drive motor power for said DC bus in the absence of power from said AC source.
A control system for a decanter centrifuge, said decanter centrifuge when rotating having kinetic energy, said control system comprising:
- (a) a variable frequency drive receiving power from an AC source and connected to a main drive motor, said main drive motor for rotating a bowl of said decanter centrifuge;
- (b) a variable frequency drive connected to a back drive motor, said back drive motor for rotating a conveyor of decanter centrifuge;
- (c) a common DC bus connected to said variable frequency drive connected to said main drive motor and to said variable frequency drive connected to said back drive motor;
- (d) means connected to said common DC bus for providing lubrication to said decanter centrifuge;
- said decanter centrifuge kinetic energy providing through said variable frequency drive connected to said main drive motor power for said DC bus in the absence of power from said AC source.
In combination,
- a decanter centrifuge comprising a bowl and a conveyor, said decanter centrifuge when rotating having kinetic energy, a control system for said decanter centrifuge comprising:
- (a) a variable frequency drive receiving power from an AC source and connected to a main drive motor, said main drive motor for rotating said bowl of said decanter centrifuge;
- (b) a variable frequency drive connected to a back drive motor, said back drive motor for rotating said conveyor of said decanter centrifuge;
- (c) a common DC bus connected to said variable frequency drive connected to said main drive motor and to said variable frequency drive connected to said back drive motor;
- and
- (d) means connected to said common DC bus and a stand for providing lubrication to said decanter centrifuge for controlling said lubrication stand;
- said decanter centrifuge kinetic energy providing through said variable frequency drive connected to said main drive motor power for said DC bus in the absence of power from said AC source.
In combination,
- a decanter centrifuge comprising a bowl and a conveyor, said decanter centrifuge when rotating having kinetic energy, a control system for said decanter centrifuge comprising:
- (a) a variable frequency drive receiving power from an AC source and connected to a main drive motor, said main drive motor for rotating said bowl of said decanter centrifuge;
- (b) a variable frequency drive connected to a back drive motor, said back drive motor for rotating said conveyor of said decanter centrifuge;
- (c) a common DC bus connected to said variable frequency drive connected to said main drive motor and to said variable frequency drive connected to said back drive motor;
- and
- (d) means connected to said common DC bus for providing lubrication to said decanter centrifuge;
- said decanter centrifuge kinetic energy providing through said variable frequency drive connected to said main drive motor power for said DC bus in the absence of power from said AC source.
Dependencies are inferred from the claim text.