Rotary Phase Converters
Submersible Pumps
Submersible pumps are designed to run overloaded; therefore, they require
more power than a typical motor at the same horsepower rating. Because
of this, Steelman recommends choosing a heavy-duty phase convertor and
only running one submersible pump per phase convertor for pumps over 10hp.
For more information contact Steelman Industries.
Center Pivot Irrigation Equipment
Irrigation applications are great candidates for powering with a phase
convertor. In the case of a center pivot system, sizing the convertor
requires some special considerations. The following table gives Phase
Convertor sizes for pivot systems with no booster pumps or end guns.
Sizing Table for Center Pivot Systems With No Auxiliary Motors
HP rating of
Tower Motors |
# of Towers |
Phase Convertor Required |
| .75 |
3-4 |
R3/10-460-HD |
| - |
5-6 |
R5/15-460-HD |
| - |
7-10 |
R7.5/20-460-HD |
| 1 |
3 |
R3/10-460-HD |
| - |
4-5 |
R5/15-460-HD |
| - |
6-7 |
R7.5/20-460-HD |
| - |
8-10 |
R10/30-460-HD |
For pivot systems with booster pumps and end guns, simply add up the
hp of all towers, end guns, and booster pumps. This gives you the total
running hp, which is the second number in the rotary model #. To determine
the starting rating of the convertor (the first number in the rotary model
#), use 60% of the total hp of the tower motors or the hp rating of the
largest pump, whichever is greater. If the pivot will ever run dry or
will run without the booster pump running, then you must add the terminal
block option (/TB1 or /TB2). This allows the phase convertor to run in
a light-loaded condition without causing an over voltage situation. Please
contact the factory for further assitance.
Computer Controlled Equipment/CNC
To achieve the voltage balance and stability required by CNC equipment,
Steelman offers the CNC line of phase convertors.
| CNC Motor Size |
Steelman Rotary Convertor
(xxx Denotes Voltage: 208, 230, or 460) |
Rotary Motor Size |
| 2 |
R3-xxx-CNC |
10 |
| 3 |
R5-xxx-CNC |
10 |
| 5 |
R7.5-xxx-CNC |
20 |
| 7.5 |
R10-xxx-CNC |
20 |
| 10 |
R15-xxx-CNC |
30 |
| 15 |
R20-xxx-CNC |
30 |
| 20 |
R25-xxx-CNC |
40 |
| 25 |
R30-xxx-CNC |
50 |
| 30 |
R40-xxx-CNC |
60 |
Elevators/Float Switch Applications/Unattended Applications
For applications that run intermittently and are unattended, special
consideration needs to be taken so that the phase convertor does not run
continuously unloaded. Steelman offers an automatic (/A) option for these
applications. This option consists of a switch and timer system that will
start the phase convertor first, allowing it to get up to speed, and then
start the load motor. After the load motor shuts off, the phase convertor
will run a predetermined amount of time to allow for quick restart of
the load motor, and then shut off.
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