Buck-Boost Transformer Installation Sheet - AutomationDirect

Buck-Boost Transformer Installation Sheet

Revised on April, 2011 by T.E.

If you are using this unit as an isolation transformer with a primary of 120 or 240 or 480 volts and the secondary of 12/24,

16/32, or 24/48 (depending on the model) use the wiring diagram located on the inside of the cover to the wiring compartment.

If you are using this unit as an auto transformer to buck (lower) or boost (raise) the voltage by a 12 to 48 volts use the

information below to select the proper wiring diagram. Note: HV= Higher Voltage, LV= Lower Voltage when bucking and

boosting.

Single Phase Chart

(Requires 1 transformer)

Low

Voltage

(LV)

95

100

106

109

120

120

120

120

200

208

212

208

218

225

230

240

240

240

240

437

457

480

480

High

Voltage

(HV)

120

120

120

120

132

136

144

152

240

236

240

230

240

240

276

252

264

272

288

480

480

504

528

Model*

Diagram #

B

A

B

A

A

B

A

B

C

B

B

A

A

B

C

A

A

B

C

C

C

C

C

2

2

1

1

1

1

2

2

2

4

4

4

4

3

2

3

4

4

2

4

3

3

4

Diagram 1

Diagram 2

Diagram 3

Diagram 4

* Model A= 120x240V-12/24V

Model B= 120x240V-16/32V

Model C= 240x480V-24/48V

Before installing, confirm: unit supports 50Hz or 60 Hz as required

Buck-Boost Installation Sheet

004-0921-Rev. F

Page 1 of 4

3-Phase Wye Chart

(Requires 3 transformers)

Open Delta Chart

(Requires 2 transformers)

Low

Voltage

(LV)

200

208

212

208

218

225

229

230

230

240

240

240

240

437

457

480

480

High

Voltage

(HV)

240

236

240

230

240

240

240

253

276

252

264

272

288

480

480

504

528

Model *

Diagram

#

C

B

B

A

A

B

A

C

C

A

A

B

C

C

C

C

C

10

12

12

12

12

11

11

9

10

11

12

12

10

12

11

11

12

Buck-Boost Installation Sheet

Low

Voltage

(LV)

164

173

183

189

208

208

208

208

346

367

378

390

397

398

398

416

416

416

416

416

004-0921-Rev. F

High

Voltage

(HV)

208

208

208

208

229

235

249

263

416

416

416

416

416

438

478

437

443

457

471

498

Model*

Diagram

#

B

A

B

A

A

B

A

B

C

B

A

B

A

C

C

A

B

A

B

C

6

6

5

5

5

5

6

6

6

8

8

7

7

5

6

7

7

8

8

6

Page 2 of 4

Buck-Boost Installation Sheet

004-0921-Rev. F

Page 3 of 4

Buck-Boost Installation Sheet

004-0921-Rev. F

Page 4 of 4

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