Jefferson Electric Inc.
1-800-892-3755
www.jeffersonelectric.com
Buck-Boost Application manual 02-12
Page 3 of 21
Step 2: What is the source and load voltage?
♦
-Are you stepping up or stepping down the voltage?
o
Stepping up: Go to the LV column in the charts and find your source
voltage.
o
Stepping down: Go to the HV column in the charts and find your source
voltage.
♦
After locating the source voltage in the charts, find your load voltage.
o
Stepping up: Go to the HV column in the charts and find your load
voltage.
o
Stepping down: Go to the LV column in the charts and find your load
voltage.
♦
Please note that you might not find the exact voltage because of the fixed change
of the buck-boost transformer. So locate the closest voltage to your load voltage
and determine if this is acceptable for your application. Note the Catalog number
shown, (e.g. 416-12xx)
Step 3: What is the amperage required by the load or the KVA of the load?
From the voltages that you have chosen, go across the chart until you find a
maximum current greater than your required current or a maximum KVA greater
than your maximum load KVA.
Step 4: From this current or KVA you will complete the catalog number for the buck-
boost transformer required.
Go up the chart to the top of the column and you will find two numbers (e.g. 11,
21, 31, etc). Place these two numbers at the end of the catalog number chosen
above in place of the xx, (e.g. 416-12
31
). The catalog number is completed by
adding a –000 to the end. (e.g. 416-1231-
000
).
Step 5: Order the number of units that are required, located in the title of the charts (1
for single-phase, 2 for open delta and 3 for wye configurations).
Step 6: Note the diagram number at the end of the row of the selected voltages. Connect
the transformers per the diagram listed for the transformers you have chosen. See
Section IV for wiring diagrams.