POWER PROTECTION
Computer Isolation Transformer System
Installation, Operation &
Maintenance Manual
TABLE OF CONTENTS
1.0
INSTALLATION INSTRUCTIONS FOR THE LIEBERT ISOLATION TRANSFORMER
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2.0
INPUT AND OUTPUT WIRING
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3.0
INSPECTION AND START-UP CHECKLIST
FOR THE LIEBERT COMPUTER ISOLATION TRANSFORMER
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4.0
MAINTENANCE
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1.0
INSTALLATION INSTRUCTIONS FOR THE LIEBERT ISOLATION TRANSFORMER
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Figure 1
Typical Installation
Installation Instructions for the Liebert Isolation Transformer
1
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1.1
Unpacking and Installation
1.1.1
Unpacking and Preliminary Inspection
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1.1.2
Handling Considerations
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1.1.3
Storage
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1.1.4
Location Considerations
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2
Installation Instructions for the Liebert Isolation Transformer
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Figure 2
Typical Cabinet Data
Max. Heat Output
Weight
kVA
60 Hz
BTU/hr
50 Hz
kCal/hr
Transformer
Type
15
2130
720
STD
290
150
K-20
310
160
20
2840
930
STD
320
165
K-20
340
175
STD
370
190
K-20
390
200
STD
500
255
K-20
650
330
STD
835
425
K-20
875
445
STD
950
485
K-20
1125
575
STD
1075
550
K-20
1475
750
STD
1185
605
K-20
1800
915
STD
1565
795
30
3740
1240
50
5450
1580
75
7750
2120
100
8800
2680
125
10650
3280
150
10480
3650
60 Hz
lbs
50 Hz
kg
200
12930
4825
K-20
2400
1220
225
13720
5555
STD
1690
860
300
19830
6615
STD
2030
1035
Dimensions
Inches (mm)
A
B
C
D
E
F
36.5
(927)
24.75
(629)
18.75
(477)
21.75
(553)
13.5
(343)
6.5
(165)
48.5
(1232)
29.5
(750)
22.75
(578)
26.5
(673)
17.5
(445)
8.5
(216)
52.5
(1334)
37.0
(940)
26.75
(680)
34.0
(864)
21.5
(546)
8.5
(216)
Installation Instructions for the Liebert Isolation Transformer
3
2.0
INPUT AND OUTPUT WIRING
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2.1
Input Power Connections
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Table 1
4
Transformer Input Voltage Tap Connections
Tap
%
For 208V
Nominal
For 240V
Nominal
For 380V
Nominal
For 415V
Nominal
For 480V
Nominal
For 480V
Nominal
4-5
+5.0%
218V
252V
399V
436V
504V
630V
4-6
+2.5%
213V
246V
390V
425V
492V
615V
3-5
Nominal
208V
240V
380V
415V
480V
600V
3-6
-2.5%
203V
234V
371V
405V
468V
585V
2-6
-5.0%
198V
228V
361V
394V
456V
570V
3-7
-7.5%
192V
222V
352V
384V
444V
555V
2-7
-10.0%
187V
216V
342V
374V
432V
540V
Input and Output Wiring
Table 2
Wire Sizing Data
Input
Output
Voltage
kVA
FLA
Suggested
OPD (AMPS)
Suggested
Wire (AWG)
FLA
Suggested
OPD (AMPS)
Suggested
Wire (AWG)
208V
15
20
30
50
75
100
125
150
200
225
300
44
58
87
144
215
285
356
427
572
644
858
60
80
110
200
300
400
450
600
800
800
1200
6
4
2
000
350kcmil
2-000*
2-0000*
2-350kcmil*
3-300kcmil*
3-300kcmil*
4-350kcmil*
42
56
83
139
208
277
347
416
555
625
833
60
70
110
175
300
350
450
600
700
800
1200
6
4
2
00
350kcmil
2-00*
2-0000*
2-350kcmil*
2-500kcmil*
3-300kcmil*
4-350kcmil*
240V
15
20
30
50
75
100
125
150
200
225
300
38
50
75
125
186
247
309
370
496
558
722
50
70
100
175
250
350
400
500
700
700
1000
8
4
2
00
250kcmil
2-00*
2-000*
2-250kcmil*
2-500kcmil*
2-500kcmil*
3-400kcmil*
380V
15
20
30
50
75
100
125
150
200
225
300
24
32
48
79
118
157
196
234
312
352
469
30
40
60
100
150
200
250
300
400
450
600
10
8
6
2
0
000
250kcmil
350kcmil
2-000*
2-0000*
2-350kcmil*
23
30
46
76
114
152
190
228
304
342
456
30
40
60
100
150
200
250
300
400
450
600
10
8
6
2
0
000
250kcmil
350kcmil
2-000*
2-0000*
2-350kcmil*
415V
15
20
30
50
75
100
125
150
200
225
300
22
29
44
72
108
143
180
216
286
322
429
30
40
60
90
150
200
225
300
400
450
600
10
8
6
2
0
000
0000
350kcmil
2-000*
2-0000*
2-350kcmil*
21
28
42
70
104
139
174
209
278
313
417
30
40
60
90
150
175
225
300
350
400
600
10
8
6
2
0
00
0000
350kcmil
2-00*
2-000*
2-350kcmil*
FLA = Full Load Amps of Isolation Transformer.
OPD = Suggested Overcurrent Protection Device for Isolation Transformer by others in
accordance with NEC 450-3(b).
Wire Sizes based on NEC Table 310-16, using 75°C 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 must
be 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 of
voltage 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 of
overcurrent protection device, voltage drop, or excessive neutral current (see NEC Table 310-16 notes 8 and 10). For best
performance, transformer should be located as close to the load as practical.
Input and Output Wiring
5
Table 2
Wire Sizing Data
Input
Output
Voltage
kVA
FLA
Suggested
OPD (AMPS)
Suggested
Wire (AWG)
FLA
Suggested
OPD (AMPS)
Suggested
Wire (AWG)
480V
15
20
30
50
75
100
125
150
200
225
300
19
25
38
62
93
124
154
185
248
279
372
25
35
50
80
125
175
200
250
350
350
500
10
8
8
4
1
00
000
250kcmil
2-00*
2-00*
2-250kcmil*
18
24
36
60
90
120
150
180
241
271
360
25
30
45
80
125
150
200
225
300
350
450
10
10
8
4
1
0
000
0000
350kcmil
2-00*
2-0000*
600V
15
20
30
50
75
100
125
150
200
225
300
15
20
30
50
75
99
124
148
198
223
297
20
30
40
70
100
125
175
200
250
300
400
12
10
8
4
2
1
00
000
250kcmil
350kcmil
2-000*
FLA = Full Load Amps of Isolation Transformer.
OPD = Suggested Overcurrent Protection Device for Isolation Transformer by others in
accordance with NEC 450-3(b).
Wire Sizes based on NEC Table 310-16, using 75°C 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 must
be 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 of
voltage 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 of
overcurrent protection device, voltage drop, or excessive neutral current (see NEC Table 310-16 notes 8 and 10). For best
performance, transformer should be located as close to the load as practical.
6
Input and Output Wiring
2.2
Output Power Connections
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2.3
System Grounding
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Input and Output Wiring
7
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2.4
Grounding Electrode Conductor
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Table 3
Minimum Suggested Grounding Electrode Conductor Sizes (AWG)
Output Voltage
kVA
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
2
225
00
0
0
300
000
00
0
Sizes based on NEC Table 250-94 using copper conductors and the suggested minimum output
conductor sizes shown in Table 1.
8
Input and Output Wiring
3.0
INSPECTION AND START-UP CHECKLIST FOR THE LIEBERT COMPUTER
ISOLATION TRANSFORMER
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3.1
Inspection
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Inspection and Start-Up Checklist for the Liebert Computer Isolation Transformer
9
3.2
Start-Up
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3.3
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11
4.0
MAINTENANCE
4.1
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Table 4
Typical Spike Suppression Replacement Parts
Output Voltage (Phase-to-Phase)
208V
380V
415V
480V
MOV Assembly
115193 - 05
115193 - 06
115193 - 07
115193 - 08
Output Filter Capacitor Assy.
115192 - 01
115192 - 02
115192 - 02
115192 - 02
Input Voltage (Phase-to-Phase)
Input Filter Capacitor Assy.
12
Maintenance
208, 240V
380, 415, 480V
600V
115194 - 01
1151934 - 02
115194 - 03
4.2
Preventive Maintenance (Inspection & Cleaning)
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Maintenance
13
14
Maintenance
Computer Isolation
Transformer System
Technical Support
U.S.A.
Outside the U.S.A.
U.K.
1-800-222-5877
614-841-6755
+44 (0) 1793 553355
France
+33 1 4 87 51 52
Germany
+49 89 99 19 220
Italy
Netherlands
E-mail
Web site
Worldwide FAX
tech support
+39 2 98250 1
+00 31 475 503333
[email protected]
http://www.liebert.com
614-841-5471
The Company Behind The Products
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