PILOTFUF signals are simultaneously activated. Only the output circuitrelated to the open phase will be active i.e either MAINFUF or PILOTFUF.3. Establish a normal voltage operating condition and observe the correspondingoutput signals. MAINFUF or PILOTFUF should change to 0 in about 27 ms.4. Set normal conditions as mentioned in step 1.5. Enable the BLOCK binary input and repeat step 2. MAINFUF or PILOTFUFshould not appear.Checking the operation of MAINFUF and PILOTFUF1. Simulate normal operation conditions with three-phase voltage on the mainfuse group and the pilot fuse group. Ensure the values are equal to their ratedvalues.2. Decrease one of the three-phase voltages on main fuse group or pilot fusegroup. The voltage change must be greater than the set value forUd>MainBlock or Ud>PilotAlarm. MAINFUF or PILOTFUF signals areactivated without any time delay.3. Set normal conditions as mentioned in step 1. MAINFUF or PILOTFUFsignals should reset.4. Set SealIn to On, UD>MainBlock to 20% of UBase and USealIn to 70% ofUBase.5. Apply three-phase voltages with the value slightly below USealIn level.6. Decrease one of the three-phase voltages on main fuse group. The voltagechange must be greater than the set value for Ud>MainBlock. MAINFUFsignal is activated.7. After more than 5 seconds increase the measured voltage back to the valueslightly below USealIn level. MAINFUF signal should not reset.8. Slowly increase measured voltage to the value slightly above USealIn untilMAINFUF signal resets.9. Record the measured voltage and compare with the set value USealIn.11.9.3.1 Completing the test GUID-38A57549-E6BF-46CB-ADFB-79305684EB67 v1Continue to test another function or end the test by changing the TESTMODEsetting to Off. Restore connections and settings to their original values, if they werechanged for testing purposes.11.10 Control SEMOD53560-1 v111.10.1 Synchrocheck, energizing check, and synchronizingSESRSYN M2377-3 v12This section contains instructions on how to test the synchrocheck, energizingcheck, and synchronizing function SESRSYN for single, double and 1½ breakerarrangements.Section 11 1MRK 505 378-UEN ATesting functionality by secondary injection220 Line differential protection RED670 2.2 IECCommissioning manual
