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1.6
Binary Outputs
A minimum of eight output relays are provided. Two of these have change over contacts, BO2 & BO3, one has a
normally closed contact, BO1 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.
BO
Checked
1NC
2NO
2NC
3NO
3NC
4
5
6
7
8
9
10
11
12
13
14
15
16
1.7
Relay Case Shorting Contacts
CT inputs and terminals C25-C26 (Relay Withdrawn Alarm) are fitted with case mounted shorting contacts which
provide a closed contact when the relay is withdrawn from the case.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
Relay Withdrawn Alarm Checked
©2013 Siemens Protection Devices Limited
Chapter 6) 7SR23 DAD Commissioning & Maintenance Guide
Notes (method of test)
Chapter 6 Page 11 of 26
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