Nortel DMS-100 Series Manuale utente

Applies to all BCS and PCL levels Standard 02.02 August 1997

297-1001–350

DMS-100 Family

Digital Switching Systems

Power and Grounding Routine Maintenance

Manual

DMS-100 Family

Power and Grounding Routine Maintenance Manual

Applies to all BCS/PCL levels

Digital Switching Systems

DMS-100 Family

Power and Grounding Routine Maintenance Manual

1988, 1989, 19941997 Northern Telecom

Printed in Canada and printed in the United States of America.

NORTHERN TELECOM CONFIDENTIAL: The information contained in this document is the property of Northern

Telecom. Except as specifically authorized in writing by Northern Telecom, the holder of this document shall keep the

information contained herein confidential and shall protect same in whole or in part from disclosure and dissemination to third

parties and use same for evaluation, operation, and maintenance purposes only.

Information is subject to change without notice. Northern Telecom reserves the right to make changes in design or components

as progress in engineering and manufacturing may warrant.

DMS

DMS-100, NT, are trademarks of Northern Telecom. DIGISNAP is a trademark of the A. W. Sperry Instruments, Inc. HP

is a trademark of the Hewlett-Packard Co.

Publication number: 297-1001-350

Product release: Applies to all BCS/PCL levels

Document release: Standard 02.02

Date: August 1997

DMS-100 Family

Power and Grounding Routine Maintenance Manual

Applies to all BCS/PCL levels

iii

Publication history

August 1997 Standard 02.02 was issued to incorporate editiorial markup and customer

feedback.

June 1994 Standard 02.01 was issued for the following reasons:

•to compose NTP 297-1001-350 in a new typographical style

(restructured format).

•to comply with the generic design intent, terminology, and definitions

of applicable Northern Telecom Corporate Standards and NTP

297-1001-156, DMS-100 Family Power Distribution and Grounding

Guide

•to improve the composition, arrangement, and structure of the content

•to simplify and improve the text, figures, and tables.

March 1989 Standard 01.04 was issued for technical corrections and replaced all

previous releases.

DMS-100 Family

Power and Grounding Routine Maintenance Manual

Applies to all BCS/PCL levels

Draft: June 2, 1993

Contents

About this document ix

Application of this document ix

References ix

Prerequisite references x

Informative references x

1 Introduction 1–1

1.1 Definitions 1–1

battery return (BR): 1–1

battery return reference (BRR): 1–1

bonding: 1–1

bonding network (BN): 1–1

building principal ground (BPG): 1–1

common bonding network (CBN): 1–1

DMS-100 Family: 1–2

DMS single point ground (DMS SPG): 1–2

floor ground bar (FGB): 1–2

framework bonding bar (FBB): 1–2

framework bonding equalizer (FBE) bar: 1–2

framework ground bus: 1–2

ground: 1–3

incidental ground: 1–3

isolated bonding network (IBN): 1–3

isolated system grounding (ISG): 1–3

isolation: 1–3

logic return bar (LRB): 1–3

logic return equalizer (LRE) bar: 1–3

single point ground (SPG): 1–4

vertical ground riser (VGR): 1–4

vertical logic return bar: 1–4

1.2 Abbreviations and acronyms 1–4

1.3 Cross reference of terms 1–6

2 Overview 2–1

2.1 DC power 2–1

2.2 AC power 2–1

2.3 Grounding 2–1

3 Power system maintenance 3–1

3.1 Preparations 3–1

vi Contents

297-1001-350 Standard 02.02 August 1997

Draft: June 2, 1993

3.1.1 Maintenance records 3–1

3.1.2 Maintenance action record 3–17

3.1.3 Tools 3–17

3.2 Power plant critical limits 3–18

3.3 Power plant maintenance schedule 3–19

3.4 Power plant checks 3–20

3.5 Power plant safety checks 3–21

3.6 Power plant fuse checks 3–22

3.7 Charging equipment checks 3–22

3.8 Battery equipment checks 3–24

3.8.1 Maintenance intervals 3–24

3.8.2 Trouble conditions 3–26

3.8.3 Post connections 3–26

3.8.4 Positive plate growth 3–26

3.8.5 Post corrosion 3–27

3.8.6 Electrolyte level and temperature 3–32

3.8.7 Water analysis report 3–32

3.8.8 Avoiding battery trouble 3–33

3.9 Standby power system checks 3–34

3.10 Standby engine-alternator checks 3–35

3.11 Standby power system exercise 3–36

3.11.1 Precautions 3–36

3.11.2 Preparations 3–37

3.11.3 Procedure 3–38

3.12 Miscellaneous power plant checks 3–41

3.13 Submitting the maintenance report 3–42

4 Grounding system maintenance 4–1

4.1 Grounding system diagrams 4–1

4.2 Tools required 4–1

4.3 Building principal ground (BPG) checks 4–2

4.4 Ground resistance test 4–3

4.5 Floor ground bar (FGB) checks 4–3

4.6 Power plant grounding checks 4–4

4.7 AC grounding checks 4–4

4.7.1 AC-free DMS switch 4–4

4.7.2 Other DMS switch versions 4–5

4.8 DMS SPG checks 4–5

4.9 Framework bonding equalizer (FBE) checks 4–6

4.10 Framework ground bus checks 4–7

4.11 Logic return equalizer (LRE) checks 4–8

4.12 Logic return bar (LRB) checks 4–9

4.13 Bonding within DMS cabinets/frames 4–9

4.14 Cable entrance ground bar (CEGB) checks 4–9

4.15 Main distribution frame/protector frame checks 4–10

4.16 Cleaning corroded grounding connections 4–11

4.17 Grounding audit 4–12

List of figures

Figure 3–1 Sample pilot cell voltage and specific gravity test record 3–3

Contents vii

DMS-100 Family

Power and Grounding Routine Maintenance Manual

Applies to all BCS/PCL levels

Draft: June 2, 1993

Figure 3–2 Sample battery electrical and specific gravity measurements

record 3–4

Figure 3–3 Sample charging plant capacity and reserves data record 3–5

Figure 3–4 Sample telephone number record 3–6

Figure 3–5 Standby engines—office loads and battery reserves record 3–7

Figure 3–6 Sample power plant alarm check record 3–8

Figure 3–7 Sample log sheet for stationary alternator routine engine runs

3–9

Figure 3–8 Sample log sheet for mobile alternator routine engine runs

3–10

Figure 3–9 Sample standby power system exercise evaluation report 3–11

Figure 3–10 Standby power system exercise control log 3–12

Figure 3–11 Standby power system exercise—stationary engine-alternator

log 3–13

Figure 3–12 Standby power system exercise—mobile engine-alternator log

3–14

Figure 3–13 Battery load test record 3–15

Figure 3–14 Power plant maintenance action required 3–16

Figure 3–15 Typical internal parts of a battery 3–29

Figure 3–16 Positive plate growth 3–30

Figure 3–17 Battery post and intercell connector corrosion 3–31

List of tables

Table 1–1 Cross reference of terms 1–6

Table 3–1 Power plant maintenance schedule 3–19

Table 3–2 Power plant data, monitored conditions 3–23

Table 3–3 Schedule of battery readings and work intervals 3–25

Table 3–4 Maximum allowable impurities in battery water 3–33

Table 3–5 Recommended battery load test duration 3–40

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