Computer Isolation Transformer

7/27/2019 Computer Isolation Transformer

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P OWER P ROTECTION

Computer Isolation Transformer System

Installation, Operation &Maintenance Manual


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TABLE OF CONTENTS

1.0 I NSTALLATION INSTRUCTIONS FOR THE LIEBERT ISOLATION TRANSFORMER

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2.0 I NPUT AND OUTPUT WIRING

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3.0 I NSPECTION AND S TART -UP CHECKLIST FOR THE LIEBERT COMPUTER ISOLATION TRANSFORMER

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Installation Instructions for the Liebert Isolation Transformer 1

1.0 I NSTALLATION INSTRUCTIONS FOR THE LIEBERT ISOLATION TRANSFORMER

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Figure 1 Typical Installation


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2 Installation Instructions for the Liebert Isolation Transformer

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1.1 Unpacking and Installation

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Installation Instructions for the Liebert Isolation Transformer 3

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Figure 2 Typical Cabinet Data

kVA

Max. Heat OutputTrans-formerType

Weight DimensionsInches (mm)

60 HzBTU/hr

50 HzkCal/hr

60 Hzlbs

50 Hzkg A B C D E F

15 2130 720 STD 290 150 36.5(927)

24.75(629)

18.75(477)

21.75(553)

13.5(343)

6.5(165)

K-20 310 16020 2840 930 STD 320 165

K-20 340 175

30 3740 1240 STD 370 190

K-20 390 200

50 5450 1580 STD 500 255

K-20 650 330 48.5(1232)

29.5(750)

22.75(578)

26.5(673)

17.5(445)

8.5(216)75 7750 2120 STD 835 425

K-20 875 445

100 8800 2680 STD 950 485

K-20 1125 575125 10650 3280 STD 1075 550

K-20 1475 750

150 10480 3650 STD 1185 605

K-20 1800 915 52.5(1334)

37.0(940)

26.75(680)

34.0(864)

21.5(546)

8.5(216)200 12930 4825 STD 1565 795

K-20 2400 1220

225 13720 5555 STD 1690 860

300 19830 6615 STD 2030 1035


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4 Input and Output Wiring

2.0 I NPUT AND OUTPUT WIRING

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Input and Output Wiring 5

Table 2 Wire Sizing Data

Voltage kVA

Input Output

FLASuggested

OPD (AMPS)SuggestedWire (AWG) FLA

SuggestedOPD (AMPS)

SuggestedWire (AWG)

208V 1520305075

100125150200225300

445887

144215285356427572644858

6080

110200300400450600800800

1200

642

000350kcmil

2-000*2-0000*

2-350kcmil*3-300kcmil*3-300kcmil*4-350kcmil*

425683

139208277347416555625833

6070

110175300350450600700800

1200

642

00350kcmil

2-00*2-0000*


240V 1520305075

100125

150200225300

385075

125186247309

370496558722

5070

100175250350400

500700700

1000

842

00250kcmil

2-00*2-000*


380V 1520305075

100125150200225300

24324879

118157196234312352469

304060

100150200250300400450600

108620

000250kcmil350kcmil

2-000*2-0000*

2-350kcmil*

23304676

114152190228304342456

304060

100150200250300400450600

108620

000250kcmil350kcmil

2-000*2-0000*

2-350kcmil*

415V 1520305075

100125150200225300

22294472

108143180216286322429

30406090

150200225300400450600

108620

0000000

350kcmil2-000*

2-0000*2-350kcmil*

21284270

104139174209278313417

30406090

150175225300350400600

108620

000000

350kcmil2-00*

2-000*2-350kcmil*

FLA = Full Load Amps of Isolation Transformer.OPD = Suggested Overcurrent Protection Device for Isolation Transformer by others inaccordance with NEC 450-3(b).Wire Sizes based on NEC Table 310-16, using 75C copper conductor.*Parallel feeders per NEC 300-20 and 310-4.NOTES: 1. Input power feeder should be a dedicated feeder direct from service entrance if possible. Ground conductors recommended to be

parity sized with power conductors for increased system performance. Ground conductor minimum size per NEC Table 250-95.Input power feeder conduit may be used as the safety ground conductor. When conduit is used, adequate electrical continuity mustbe maintained at conduit connections to enclosures and throughout conduit run.

2. Input feeder wire size listed in Table 2 is the minimum feeder size recommended. Larger wire size may be required because ofvoltage drop or supply overcurrent protection device.

3. Output feeder wire size listed in Table 2 is the minimum feeder size recommended. Larger wire size may be required because ofovercurrent protection device, voltage drop, or excessive neutral current (see NEC Table 310-16 notes 8 and 10). For bestperformance, transformer should be located as close to the load as practical.


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480V 1520305075

100125150200225300

1925386293

124154185248279372

25355080

125175200250350350500

108841

00000

250kcmil2-00*2-00*

2-250kcmil*

1824366090

120150180241271360

25304580

125150200225300350450

10108410

0000000

350kcmil2-00*

2-0000*

600V 1520305075

100125

150200225300

152030507599

124

148198223297

20304070

100125175

200250300400

12108421

00

000250kcmil350kcmil

2-000*

Table 2 Wire Sizing Data

Voltage kVA

Input Output

FLASuggested

OPD (AMPS)SuggestedWire (AWG) FLA

SuggestedOPD (AMPS)

SuggestedWire (AWG)

FLA = Full Load Amps of Isolation Transformer.OPD = Suggested Overcurrent Protection Device for Isolation Transformer by others inaccordance with NEC 450-3(b).Wire Sizes based on NEC Table 310-16, using 75C copper conductor.*Parallel feeders per NEC 300-20 and 310-4.NOTES: 1. Input power feeder should be a dedicated feeder direct from service entrance if possible. Ground conductors recommended to be

parity sized with power conductors for increased system performance. Ground conductor minimum size per NEC Table 250-95.Input power feeder conduit may be used as the safety ground conductor. When conduit is used, adequate electrical continuity mustbe maintained at conduit connections to enclosures and throughout conduit run.

2. Input feeder wire size listed in Table 2 is the minimum feeder size recommended. Larger wire size may be required because ofvoltage drop or supply overcurrent protection device.

3. Output feeder wire size listed in Table 2 is the minimum feeder size recommended. Larger wire size may be required because ofovercurrent protection device, voltage drop, or excessive neutral current (see NEC Table 310-16 notes 8 and 10). For bestperformance, transformer should be located as close to the load as practical.


11/19

Input and Output Wiring 7

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Table 3 Minimum Suggested Grounding Electrode Conductor Sizes (AWG)

kVAOutput Voltage

208V 380V, 415V 480V

15 8 8 8

20 8 8 8

30 8 8 8

50 4 8 8

75 2 6 6

100 2 4 6

125 2 2 4

150 0 2 2

200 00 2 2225 00 0 0

300 000 00 0Sizes based on NEC Table 250-94 using copper conductors and the suggested minimum outputconductor sizes shown in Table 1 .


13/19

Inspection and Start-Up Checklist for the Liebert Computer Isolation Transformer 9

3.0 I NSPECTION AND S TART -UP CHECKLIST FOR THE LIEBERT COMPUTER ISOLATION TRANSFORMER

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14/19

10 Inspection and Start-Up Checklist for the Liebert Computer Isolation Transformer

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15/19

Inspection and Start-Up Checklist for the Liebert Computer Isolation Transformer 11

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16/19

12 Maintenance

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17/19

Maintenance 13

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18/19

14 Maintenance


19/19

Computer IsolationTransformer System

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U.S.A. 1-800-222-5877

Outside the U.S.A. 614-841-6755

U.K. +44 (0) 1793 553355

France +33 1 4 87 51 52

Germany +49 89 99 19 220

Italy +39 2 98250 1

Netherlands +00 31 475 503333

E-mail [email protected]

Web site http://www.liebert.com

Worldwide FAXtech support

614-841-5471

Documents

Computer Isolation Transformer