![background image](http://html1.mh-extra.com/html/abb/relion-rex640/relion-rex640_quick-operation-manual_3419864012.webp)
12
B I O -TE STE R R E X6 4 0
Q U I C K O P ER AT I O N G U I D E
After successful testing:
• Switch off the power supply. Ensure the de-energized
state of both REX640 protection relay under testing and
the BIO-Tester.
• Remove all test connector cables and put them back inside
the BIO-Tester case.
• Connect all secondary wiring connector terminals back to
the protection relay. Ensure the correctness and tightness
of connectors.
• Switch on the auxiliary supply voltages of the protection
relay and the LHMI.
• Restore all the settings according to recommended set-
tings chart and follow the site testing and commissioning
guidlines before energizing the feeder.