Work machine having an electric drive
First Claim
1. A work machine having an electric drive comprising power electronics which have at least one transformer and/or an intermediate circuit, and having power connections covered by a cover for connecting power cables, wherein a manually actuable grounding device is provided for grounding of the at least one transformer and/or for short-circuiting of the at least one intermediate circuit, wherein the grounding device is coupled to a cover latching for latching the cover such that the cover is unlatched by actuating the grounding device;
- wherein the at least one transformer comprises a residual voltage gauge for measuring a residual voltage that is applied to the at least one transformer or to the transformer intermediate circuit, wherein the grounding device comprises an actuation lock for locking the grounding device in an undergrounded and/or non-short-circuited position in dependence on the measured residual voltage, wherein the actuation lock can only be released, or is automatically released, when the residual voltage measured by the residual voltage gauge is smaller than a predefined voltage limit.
1 Assignment
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Accused Products
Abstract
The present invention relates to a work machine, in particular to a construction machine and/or mining machine such as a crawler-type vehicle, a dump truck, mining device or the like, having an electric drive which comprises power electronics which have at least one transformer which has power connections covered by a cover for connecting power cables, wherein a manually actuable grounding device is provided for the all-pole grounding of the transformer and/or for short-circuiting an intermediate circuit connected thereto. The invention in this respect in particular also relates to such a transformer. In accordance with the invention, the manually actuable grounding device is coupled to a cover latch of the cover such that the cover can be unlatched by actuating the named grounding device.
6 Citations
18 Claims
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1. A work machine having an electric drive comprising power electronics which have at least one transformer and/or an intermediate circuit, and having power connections covered by a cover for connecting power cables, wherein a manually actuable grounding device is provided for grounding of the at least one transformer and/or for short-circuiting of the at least one intermediate circuit, wherein the grounding device is coupled to a cover latching for latching the cover such that the cover is unlatched by actuating the grounding device;
wherein the at least one transformer comprises a residual voltage gauge for measuring a residual voltage that is applied to the at least one transformer or to the transformer intermediate circuit, wherein the grounding device comprises an actuation lock for locking the grounding device in an undergrounded and/or non-short-circuited position in dependence on the measured residual voltage, wherein the actuation lock can only be released, or is automatically released, when the residual voltage measured by the residual voltage gauge is smaller than a predefined voltage limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A transformer for a work machine having an electric drive, the transformer having power connections covered by a cover for connecting power cables, wherein a manually actuable grounding device is provided for grounding of the transformer and/or for a short-circuiting of at least one intermediate circuit, wherein the grounding device is coupled to a cover latching for latching the cover such that the cover is unlatched by actuating the grounding device;
wherein the transformer comprises a residual voltage gauge for measuring a residual voltage that is applied to the transformer or to the transformer intermediate circuit, wherein the grounding device comprises an actuation lock for locking the grounding device in an ungrounded and/or non-short-circuited position in dependence on the measured residual voltage, wherein the actuation lock can only be released, or is automatically released, when the residual voltage measured by the residual voltage gauge is smaller than a predefined voltage limit. - View Dependent Claims (17, 18)
Specification