7SR11 & 7SR12 Commissioning and Maintenance Guide
©2017 Siemens Protection Devices Limited Chapter 6 Page 10 of 72
1.6 Binary Outputs
A minimum of five output relays are provided. Two of these have change over contacts, BO1 & BO2 and the
remainder have normally open contacts.
Care should be observed with regard to connected devices when forcing contacts to operate for test purposes.
Short duration energisation can cause contact failure due to exceeding the break capacity when connected to
inductive load such as electrically reset trip relays.
Close each output relay in turn from the Reydisp Evolution PC programme, Relay – Control - Close output relay.
This function will energise the output for its minimum operate time. This time is specified in the Output Config -
Binary Output Config menu for each output relay and may be too short to measure with a continuity tester.
An alternative method of energising an output permanently so that wiring can be checked is to temporarily map
the relay being tested to the ‘Protection Healthy’ signal in the Output Matrix, as this signal is permanently
energised the mapped relay will be held energised, normally open contacts will be closed and vice versa.
1.7 Relay Case Shorting Contacts
CT input terminals and the terminals of normally closed contacts of Binary outputs 1 & 2 are fitted with case
mounted shorting contacts which provide a closed contact when the relay is withdrawn from the case. The
operation of these contacts should be checked.
CT Shorting contacts checked
Binary Output 1 terminals 1 & 2
Binary Output 2 terminals 5 & 6
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