Siemens 7sg15 microtapp Operation Manual page 89

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Keep these keys pressed until the text "CHANGING CONTRAST" appears on the screen.
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This may take up to a minute. Keep watching the screen as the text will only flash up and it is easy to
miss.
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You can then make small adjustments so the LCD reads correctly.
The relay should be mounted to allow the operator the best access to the relay functions.
4 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.
The relays and protection systems manufactured under the Reyrolle brand currently do not come
within the scope of either the European WEEE or RoHS directives as they are equipment making up a
fixed installation.
5 External Connections
Application diagrams are provided elsewhere in this manual (refer to section 5).
External connections include the requirement for twisted pair cables connected between MicroTAPP control
devices operating in a group. The control relay at each end of the loop of twisted pair cables require bus end
resistors to be connected. These are provided inside every MicroTAPP relay but only need to be connected at
both ends of the twisted pair interconnections (see section 1, Appendix C of this manual).
The twisted pair cable section must be earthed at one end only.
The twisted pair cable should be a single twisted pair overall shielded cable typically 22AWG (7 x 30) 0.35mm
conductors. Belden cable No 8761 or equivalent is recommended – available from RS Components.
6 Earthing
Terminal 15 of the PSU (Power Supply Unit) should be solidly earthed by a direct connection
to the panel earth. The Relay case should be connected to terminal 15 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.
7 Relay Dimensions
The relay is supplied in an Epsilon case. Diagrams are provided elsewhere in this manual.
©2012 Siemens Protection Devices Limited
7SG15 MicroTAPP Installation
Chapter 6 Page 4 of 5
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