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:
Mar. 30, 2010
Filed:
May. 02, 2006
Risto Komulainen, Klaukkala, FI;
Janne Pakkala, Merikaarto, FI;
Risto Komulainen, Klaukkala, FI;
Janne Pakkala, Merikaarto, FI;
Vacon Oyj, Vaasa, FI;
Abstract
An arrangement and method for monitoring a frequency converter, the frequency converter being a voltage-controlled PWM frequency converter provided with a control unit and having an uncontrolled or a main-frequency controlled main bridge connectable to an alternating-current source (U, U, U), a direct-voltage intermediate circuit and a controlled load bridge for producing a variable-frequency multi-phase output voltage (U, U, U), which direct-voltage intermediate circuit of the frequency converter is provided with a small-capacitance direct-voltage capacitor, the main bridge being connected to the load bridge directly without a large-capacitance direct-voltage capacitor functioning as an intermediate energy storage, and the arrangement includes a measuring unit for measuring the direct voltage of the intermediate voltage circuit. In the arrangement, the measuring unit measures at least one quantity of the intermediate-circuit direct voltage, and the control unit determines on the basis of the aforesaid quantity at least one input voltage value and/or a failure situation of the frequency converter or its load circuit.