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Section 1: Installation
1.1
Packaging
Relays are supplied in packaging designed to mechanically protect them while in both transit and storage.
This packaging should be recycled where systems exist, or disposed of in a manner which does not provide a
threat to health or the environment. All laws and regulations specific to the country of disposal should be adhered
to.
1.2
Unpacking, Storage and Handling
On receipt remove the relay from the container in which it was received and inspect it for obvious damage. It is
recommended that the relay not be removed from its case.
If damage has been sustained a claim should be immediately be made against the carrier, also inform Siemens
Protection Devices Limited, and the nearest Siemens agent.
When not required for immediate use, Relays should be stored in their original packaging. The place of storage
should be dry and free from dust. It should also not exceed the storage temperature and humidity limits of the
relay, given in the Performance Specification of this manual.
The relay contains static sensitive devices, which are susceptible to damage due to static discharge. The relay's
electronic circuits are protected from damage by static discharge when the relay is housed in its case.
The relay element should not be withdrawn or reinserted into the relay case while auxiliary voltage is present.
There can be no requirement to disassemble the relay, since there are no user serviceable parts. If any modules
have been tampered with, then the guarantee will be invalidated. Siemens Protection Devices Limited reserves
the right to charge for any subsequent repairs.
1.3
Recommended Mounting Position
The relay uses a liquid crystal display (LCD) for programming and operation.
angle of ± 30˚ and is back–lit. However, the best viewing position is at eye level, and this is particularly important
given its control features.
The relay should be mounted to allow the operator the best access to the relay functions.
1.4
Wiring
The product should be wired according to the scheme requirements, with reference to the appropriate wiring
diagram.
Note that when the relay is powered-up for the first time, it is good practice to do so with the trip and control links
removed. This limits potential damage caused by incorrect scheme wiring.
1.5
Earthing
Terminal 28 of the PSU (Power Supply Unit) should be solidly earthed by a direct connection to the panel earth.
The relay case earth stud connection should be connected to terminal 28 of the PSU.
It is normal practice to additionally 'daisy chain' together the case (safety) earths of all the relays installed in a
panel to prevent earth current loops posing a risk to personnel.
1.6
Ancillary Equipment
The relay can be interrogated locally or remotely. For local interrogation a portable PC with a minimum of MS
Windows XP (with SP3 installed) and Reydisp Evolution software can be used. This uses USB port (Com 2)
situated on front of the relay.
The latest version of Reydisp is available as a free for download from our website.
1.7
Disposal
The Relay should be disposed of in a manner which does not provide a threat to health or the environment. All
laws and regulations specific to the country of disposal should be adhered to.
© 2018 Siemens Protection Devices Limited
Chapter 5 - 7SR157 Installation Guide
The LCD has a vertical viewing
Chapter 5 - Page 3 of 18
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