Siemens Reyrolle 7SR5 Operating Manual page 13

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If the device has been in storage for more than 2 years, connect it to an auxiliary voltage for 1 to 2 days.
This action will cause the electrolytic capacitors to form on the printed circuit board assemblies again.
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If devices are to be shipped elsewhere, you can reuse the transport packaging. Storage packing of the
individual devices is not adequate for transport purposes.
Reyrolle 7SR5, Operating, Manual
C53000-B7040-C013-1, Edition 05.2021
1.1 Unpacking, Repacking, Returning, and Storing
First Steps
13