Rotary Phase Converters - Applications

Posted on October 19th, 2016 by vapro

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  • Center Pivot
    Irrigation Equipment
  • Computer Controlled
    Equipment/CNC
  • Welding
    Machines
  • Other
    Applications

Center Pivot Irrigation Equipment

Irrigation applications are great candidates for powering with a phase converter. In the case of a center pivot system, sizing the converter requires some special considerations. The following table gives Phase converter 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 TowersPhase converter Required
.753-4R3/10-460-HD
5-6R5/15-460-HD
7-10R7.5/20-460-HD
13R3/10-460-HD
4-5R5/15-460-HD
6-7R7.5/20-460-HD
8-10R10/30-460-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 converter (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 converter 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 converters.

CNC Motor SizeSteelman Rotary Converter
(xxx Denotes Voltage: 208, 230, or 460)
Rotary Motor Size
2R3-xxx-CNC10
3R5-xxx-CNC10
5R7.5-xxx-CNC20
7.5R10-xxx-CNC20
10R15-xxx-CNC30
15R20-xxx-CNC30
20R25-xxx-CNC40
25R30-xxx-CNC50
30R40-xxx-CNC60

Rotary Phase Converters for Welding Machines

230 VOLT
ROTARY UNITAMPERAGE @ 230VRATING IN KW
R-2/4-230-LD1 – 72.8
R-3/6-230-LD,
R-2/6-230-HD 
8 – 145.6
R-5/10-230-LD,
R-3/10-230-HD
15 – 187.2
R-7.5/15-230-LD,
R-5/15-230-HD
19 – 2811.1
R-10/20-230-LD,
R-7.5/20-230-HD
29 – 3614.3
R-15/30-230-LD,
R-10/30-230-HD
37 – 5220.7
R-20/40-230-LD,
R-15/40-230-HD
53 – 6224.7
R-25/50-230-LD,
R-25/50-230-HD
63 – 7630.3
R-30-60-230-LD,
R-25/60-230-HD
77 – 10039.8
R-40/80-230-LD,
R-30/80-230-HD
101 – 12449.4
R-50/100-230-LD,
R-40/100-230-HD
125 – 14658.1
460 VOLT
ROTARY UNITAMPERAGE @ 460VRATING IN KW
R-2/4-460-LD1 – 32.8
R-3/6-460-LD,
R-2/6-460-HD
4 – 75.6
R-5/10-460-LD,
R-3/10-460-HD
8 – 97.2
R-7.5/15-460-LD,
R-5/15-460-HD
10 – 1411.1
R-10/20-460-LD,
R-7.5/20-460-HD
15 – 1814.3
R-15/30-460-LD,
R-10/30-460-HD
19 – 2620.7
R-20/40-460-LD,
R-15/40-460-HD
27 – 3124.7
R-25/50-460-LD,
R-20/50-460-HD
32 – 3830.3
R-30-60-460-LD,
R-25/60-460-HD
39 – 5039.8
R-40/80-460-LD,
R-30/80-460-HD
51 – 6249.4
R-50/100-460-LD,
R-40/100-460-HD
63 – 7358.1

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 converter and only running one submersible pump per phase converter for pumps over 10hp. For more information contact Steelman Industries.

Elevators/Float Switch Applications/Unattended Applications

For applications that run intermittently and are unattended, special consideration needs to be taken so that the phase converter 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 converter first, allowing it to get up to speed, and then start the load motor. After the load motor shuts off, the phase converter will run a predetermined amount of time to allow for quick restart of the load motor, and then shut off.

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