The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 2005
Filed:
Jul. 01, 2002
Heikki Saari, Espoo, FI;
Osmo Pasuri, Ojakkala, FI;
Aarne Mielonen, Kerava, FI;
ABB Oy, Helsinki, FI;
Abstract
A method and an arrangement for stopping sectional drive controllably in connection with a fault situation in the supplying mains, the sectional drive comprising a plurality of inverters () which are supplied by a DC intermediate circuit () supplied by the mains (), a plurality of electric motors () which are controlled by inverters with speed and/or torque control and which are used for implementing speed and tightness reference values of the strip in the sectional drive system, the tightness reference value being predetermined motor-specifically or motor-group-specifically. Prior to stopping the sectional drive, the method comprises the implementing step of predetermining an estimate (T) of the time needed for stopping the motors, whereby the method comprises the steps, in connection with a fault situation, of detecting a fault situation in the supplying mains, forming a deceleration reference value for the motors for stopping the motors within a predetermined time, controlling the speed of the speed-controlled motors in the sectional drive on the basis of the deceleration reference value, controlling the torque of the torque-controlled motors in the sectional drive on the basis of the predetermined tightness reference value, determining the magnitude of the DC voltage intermediate circuit () and altering the deceleration reference value on the basis of the magnitude of the DC voltage.