Siemens 7SR242 Duobias, Technical Manual

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Chapter 5) 7SR242 Duobias Installation Guide
©2015 Siemens Protection Devices Limited Chapter 5 Page 5 of 24
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 to the nearest Siemens agent, using the Defect Report Form in the Maintenance
section of this manual.
When not required for immediate use the relay should be returned to its original carton and stored in a clean, dry
place.
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element should not be withdrawn or reinserted into the relay case while auxiliary voltage is present.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 any relay, since there are no user serviceable parts in the relay. If
any modules have been tampered with 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) which is used in the programming and for operation. The LCD has a
vertical viewing 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 on the circuit breaker (or protection panel) 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. Refer to the appropriate Diagrams and Parameters document for a cross reference of wiring diagrams
and models.
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 suitable version of
MS Windows and Reydisp™ s/w using USB port situated on front of the relay.