Liebert 7400 Series

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7400 Series UPS

Single and 1+1 IOM Manual 6310018a.02.doc

Prelim vii

Issue 2

(02/98)

4.4.1 Connections...................................................................................................................................................4-8

4.5 Remote Alarm and Control Panel (Part No. 4305002 A)...................................................................................4-10

4.5.1 Introduction.................................................................................................................................................4-10

4.5.2 Connections.................................................................................................................................................4-11

4.6 RS 232 Communications Management Board (SGC) (4550002C) ....................................................................4-15

4.6.1 Introduction.................................................................................................................................................4-15

4.6.2 General Information ....................................................................................................................................4-16

4.7 5th Harmonic Input Filter...................................................................................................................................4-18

4.7.1 Introduction.................................................................................................................................................4-18

4.7.2 Specification................................................................................................................................................4-18

4.7.3 Notes on connection ....................................................................................................................................4-18

4.8 Cable top entry kit..............................................................................................................................................4-24

4.8.1 Introduction.................................................................................................................................................4-24

4.9 Pulse Option.......................................................................................................................................................4-25

4.9.1 Introduction.................................................................................................................................................4-25

4.9.2 Electrical connection...................................................................................................................................4-25

4.10 Option Board Kit (Part no. 77000005).............................................................................................................4-29

4.10.1 Introduction...............................................................................................................................................4-29

4.10.2 Installation.................................................................................................................................................4-29

5. Chapter 5 - Maintenance.........................................................................................................................................5-1

5.1 Introduction..........................................................................................................................................................5-1

5.2 Safety Precautions ................................................................................................................................................5-1

5.3 Scheduled Maintenance........................................................................................................................................5-1

5.3.1 Daily checks ..................................................................................................................................................5-1

5.3.2 Weekly checks...............................................................................................................................................5-3

5.3.3 Annual Service ..............................................................................................................................................5-3

5.3.4 Extended service............................................................................................................................................5-4

5.3.5 Battery maintenance ......................................................................................................................................5-4

6. Chapter 6 - Troubleshooting...................................................................................................................................6-1

6.1 Troubleshooting UPS Systems .............................................................................................................................6-1

6.1.1 Operating parameters and limitations............................................................................................................6-1

6.1.2 General Troubleshooting Procedure.............................................................................................................6-1

6.2 Display panel message interpretation ...................................................................................................................6-5

7. Chapter 7 - SPECIFICATION................................................................................................................................7-1