3 COMMISSIONING TEST MENUThe IED provides several test facilities under the COMMISSION TESTS menu heading. There are menucells that allow you to monitor the status of the opto-inputs, output relay contacts, internal Digital Data Bus(DDB) signals and user-programmable LEDs. This section describes these commissioning test facilities.3.1 OPTO I/P STATUS CELL (OPTO-INPUT STATUS)This cell can be used to monitor the status of the opto-inputs while they are sequentially energised with asuitable DC voltage. The cell is a binary string that displays the status of the opto-inputs where '1' meansenergised and '0' means de-energised. If you move the cursor along the binary numbers, the correspondinglabel text is displayed for each logic input.3.2 RELAY O/P STATUS CELL (RELAY OUTPUT STATUS)This cell can be used to monitor the status of the relay outputs. The cell is a binary string that displays thestatus of the relay outputs where '1' means energised and '0' means de-energised. If you move the cursoralong the binary numbers, the corresponding label text is displayed for each relay output.The cell indicates the status of the output relays when the IED is in service. You can check for relay damageby comparing the status of the output contacts with their associated bits.Note:When the Test Mode cell is set to Contacts Blocked, the relay output status indicates which contacts would operate ifthe IED was in-service. It does not show the actual status of the output relays, as they are blocked.3.3 TEST MODE CELLThis cell allows you to perform secondary injection testing. It also lets you test the output contacts directly byapplying menu-controlled test signals.To go into test mode, select the Test Mode option in the Test Mode cell. This takes the IED out of servicecausing an alarm condition to be recorded and the Out of Service LED to illuminate. This also freezes anyinformation stored in the CB CONDITION column. In IEC 60870-5-103 versions, it changes the Cause ofTransmission (COT) to Test Mode.In Test Mode, the output contacts are still active. To disable the output contacts you must select theContacts Blocked optionOnce testing is complete, return the device back into service by setting the Test Mode Cell back toDisabled.Caution:When the cell is in Test Mode, the Scheme Logic still drives the output relays,which could result in tripping of circuit breakers. To avoid this, set the TestMode cell to Contacts Blocked.Note:Test mode and Contacts Blocked mode can also be selected by energising an opto-input mapped to the TestMode signal, and the Contact Block signal respectively.MiCOM P747 Chapter 14 - Commissioning InstructionsP747-TM-EN-1 345
