Unpacking, Storage And Handling; Recommended Mounting Position; Wiring; Earthing - Siemens 7SR18 Solkor Manual

Section 1: Introduction
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relay element should not be withdrawn or reinserted into the relay case while auxiliary voltage is present.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 any relay, since there are no user serviceable parts in the relay.
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. 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 features.
1.4

Wiring

The product should be wired according to the scheme requirements, with reference to the appropriate wiring
diagram.
Wire specification and size should be selected to suit the application.
The device does not contain any internal fuse or other user serviceable protection components. Typically the
PSU is connected to the auxiliary supply via an external HRC fuse rated at 6 A (BS88/IEC60269 or suitably
rated miniature circuit-breaker may be installed. Isolation links may also be installed in accordance with user
requirements.
The equipment shall be isolated or disconnected from hazardous live voltage before access to potentially
hazardous live parts is affected.
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. A minimum wire
2
size of 2.5 mm is recommended. Before any subsequent maintenance or other interaction with the device,
the integrity of this protective conductor connection shall be checked before carrying out any other actions.
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.
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7SR18 Installation Guide
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