Method for monitoring the ground potential of a rectifier drive
AssigneeJohannes Heidenhain GmbH
InventorsNorbert Huber, Franz Ritz
Life of this patent
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Abstract
A method for ground potential monitoring of a rectifier drive, having a capacitor which is connected with a voltage source via a switching device. The method including applying a test voltage between a connector of a capacitor of a rectifier drive and a mass or ground potential prior to connecting the rectifier drive with a voltage source that is connected with the capacitor via a switching device. The method also includes releasing the switching device if a potential of the connector changes by a predetermined amount after the applying the test voltage.
Claims25
A method for ground potential monitoring of a rectifier drive, having a capacitor which is connected with a voltage source via a switching device, the method comprising:
- applying a test voltage between a connector of a capacitor of a rectifier drive and a mass or ground potential prior to connecting said rectifier drive with a voltage source that is connected with said capacitor via a switching device;
- and
- releasing said switching device if a potential of said connector changes by a predetermined amount after said applying said test voltage.
A ground potential monitoring system comprising:
- a voltage source;
- a rectifier drive comprising:
- controllable semiconductor power switches;
- and
- recovery diodes arranged parallel with respect to charging connectors of said semiconductor power switches;
- a capacitor connected via a switching device with said voltage source, wherein said capacitor comprises a negative potential connector;
- at least one electric motor drive connected to said semiconductor power switches;
- a comparator comprising:
- a first input connected to said negative potential connector;
- a second input connected to a reference voltage source;
- and
- an output connected to a triggering device;
- wherein said negative potential connector is charged with a test voltage.
Dependencies are inferred from the claim text.