3-5 Charging the battery ............................................................................................ 92
3-6 Measuring the initial value of backup time ........................................................... 92
3-7 Recharging the battery ......................................................................................... 93
4 Maintenance and inspection ................................................................... 94
4-1 Self-diagnosis test ................................................................................................ 94
4-2 Checking the battery ............................................................................................ 95
4-2-1 Battery life expectancy (* Not guaranteed performance) ........................................................ 95
4-2-2 Methods for checking the battery ....................................................................................... 95
4-3 Measuring the backup time .................................................................................. 96
4-3-1 How to measure backup time ............................................................................................ 96
4-3-2 Estimated backup time ...................................................................................................... 97
4-4 Replacing the battery ......................................................................................... 100
4-4-1 Notification that the battery needs to be replaced ............................................................ 102
4-4-2 Battery replacement method ............................................................................................ 102
4-5 Replacing the fan ............................................................................................... 108
4-5-1 Fan replacement procedure ............................................................................................. 109
4-6 Cleaning the unit ................................................................................................ 113
5 Using the shutdown software ................................................................ 114
6 Contact signal ....................................................................................... 115
6-1 Contact signal .................................................................................................... 115
6-1-1 Contact signal .................................................................................................................. 115
6-1-2 Signal output .................................................................................................................... 116
6-1-3 Signal input ...................................................................................................................... 116
6-1-4 Contact signal I/O connector (DSUB9P female) .............................................................. 117
6-1-5 Contact signal ratings ...................................................................................................... 117
6-1-6 Contact signal circuit inside the UPS ............................................................................... 118
6-1-7 Examples of use of contact signal circuits ....................................................................... 119
6-1-8 Precautions and notes for the use of the contact signal .................................................. 119
7 Using an optional card .......................................................................... 120
7-1 Mounting an optional card ................................................................................. 120
7-2 Optional card ...................................................................................................... 121
7-2-1 Contact signal I/O card (SC08) ........................................................................................ 121
7-2-2 Overview of network card (SC21) and SNMP/Web card (SC20G2) ................................ 122
8 Troubleshooting .................................................................................... 123
Reference documents .............................................................................. 127
A. Specifications ....................................................................................................... 127
B. External dimensions ............................................................................................ 129
C. Battery life ............................................................................................................ 134
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