GE P444

Main
tenance P44x/EN MT/Hb
6
MiCOM P40 Agile P442,
P444 (MT) 10-
3
CONTENTS
1 MAINTENANCE 5
1.1 Maintenance Period 5
1.2 Maintenance Checks 5
1.2.1 Alarms 5
1.2.2 Opto-isolators 5
1.2.3 Output Relays 5
1.2.4 Measurement accuracy 5
1.3 Method of Repair 6
1.3.1 Replacing the Complete Relay 6
1.3.2 Replacing a PCB 7
1.4 Recalibration 16
1.5 Changing the battery 16
1.5.1 Instructions for Replacing The Battery 16
1.5.2 Post Modification Tests 17
1.5.3 Battery Disposal 17