Rotary Converter Installation Instructions

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1.

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Magnetic controls or   single-phase  loads  must  always be energized  by  lines T-1 and T-2.  Never connect  a ground  or neutral to line T-3 (Mfg. phase), which can easily be identified as the line with the highest voltage to ground with the converter running.
2.

It is essential  that   careful  consideration  be  given  to  your  wiring   length  and  size  to prevent  slow starting  due to a   voltage  drop .  Consult  National  Electrical  Code   for proper wire sizing.

3.

When starting a  motor of   the same  horsepower as  the " Largest Motor" rating of the rotary converter,  some drop in starting torque may occur in heavily loaded applications due to  the  higher starting current.  However, full running torque is usually still obtained. Refer to APPLICATION   NOTES for sizing considerations.
4.

The tables  below show the appropriate idle current at the specified voltage. Higher line voltage will cause idle current to increase. Excessive amperage could also be caused by incorrect installation.

5. Properly ground all electrical equipment.
6. Converter should reach full speed within 2 to 3 seconds.
7.

Lubricate every 12 months for normal operation, or every 6 months for continuous (24 hour)  operation.  Use   high  temp  bearing  grease,   (Shell  "Dolium R"  or  equivalent) available from GROMAX.
8.

Converters  are intended   for  use  in  clean,  dry locations  with  access to an  adequate supply  of cooling  air.  In  addition,  there   should  be  protection  from or avoidance of flammable  or combustible  materials  in the  area  of  converters as they can eject flame and/or metal in the event of an insulation failure.

220V

230V Models  ( R Series) & Electrical Specifications

Model

Largest Motor HP See *Note Below

Total Combined HP Load See **Note Below

Approx. Idle Current

Disconnect Switch Fuse (Time Delay)

NEMA Starter

Starter Heater

Minimum Single Phase Supply
See ***Note Below

R-1

1 HP*

3 HP**

1.5 AMPS

10 AMPS

00

4.8 AMPS

15 AMPS***
R-2

2 HP*

6 HP**

2 AMPS

10 AMPS

0

7.7 A

15 AMPS***
R-3

3 HP*

9 HP**

2.5 AMPS

15 AMPS

0

10.4 A

20 AMPS***
R-5

5 HP*

15 HP**

3 AMPS

30 AMPS

1

15.9 A

30 AMPS***
R-7

7 1/2 HP*

22 HP**

5 AMPS

40 AMPS

1

26 A

40 AMPS***
R-10

10 HP*

30 HP**

7 AMPS

45 AMPS

2

35 A

60 AMPS***
R-15

15 HP*

45 HP**

8 AMPS

60 AMPS

3

48 A

100 AMPS***
R-20

20 HP*

60 HP**

10 AMPS

80 AMPS

3

63 A

125 AMPS***
R-25

25 HP*

75 HP**

11 AMPS

100 AMPS

3

80 A

160 AMPS***
R-30

30 HP*

90 HP**

12 AMPS

125 AMPS

3

94 A

200 AMPS***
R-40

40 HP*

120 HP**

13 AMPS

150 AMPS

4

117 A

250 AMPS***
R-50

50 HP*

150 HP**

15 AMPS

200 AMPS

5

145 A

300 AMPS***
*Largest Motor HP:  Almost all machines require sizing the converter 50% larger or more than the largest HP motor of your machine.

**Total Combined HP Load: HP shown in chart reflects maximum HP allowable under specific conditions. EXAMPLE: Multiple machinery not started at the same time and that is running lightly loaded. 

***Minimum Single Phase Supply: Single-phase supply shown is for absolute maximum output of the Rotary Converter. Most of the time the converter is oversized to provide the high starting current for the motor. It is not always necessary to use single-phase breakers sized this large. See the following formula.  
Formula: Total three-phase amperage (running load amperage) the machine(s) will ever draw multiplied by 1.5 (extra single-phase needed to generate the third leg), then add the idle current of the Rotary Converter. That will give you the total single-phase amps that will ever be drawn from the single-phase lines. Size the single-phase breaker minimum 20% above that total amperage draw and size the wire accordingly. 

IMPORTANT:  This chart is simplified and cannot reflect the many types of applications possible. Contact GROMAX to verify your phase converter requirements. Also refer to APPLICATION NOTES for sizing considerations.

Larger Horsepower phase converter systems may be obtained by connecting multiple Rotary Converters in parallel. See Multiple Units Banked Together.

460V

460V Models  ( RH Series) & Electrical Specifications
Model Largest
Motor
HP 
See *Note Below		 Total
Combined
HP Load See **Note Below		 Approx.
Idle
Current		 Disconnect
Switch Fuse
(Time Delay)		 NEMA
Starter		 Starter Heater Minimum Single Phase Supply
See ***Note Below
RH-20  20 HP*  60 HP** 5 AMPS  40 AMPS 2 35 AMPS 60 AMPS***
RH-30  30 HP*  90 HP**

6 AMPS

  60 AMPS 3 48 AMPS 100 AMPS***
RH-40 40 HP* 120 HP** 8 AMPS 80 AMPS 3 63 AMPS 125 AMPS***
RH-50 50 HP* 150 HP** 9 AMPS 100 AMPS 3 78 AMPS 150 AMPS***
*Largest Motor HP:  Almost all machines require sizing the converter 50% larger or more than the largest HP motor of your machine.

**Total Combined HP Load: HP shown in chart reflects maximum HP allowable under specific conditions. EXAMPLE: Multiple machinery not started at the same time and that is running lightly loaded. 

***Minimum Single Phase Supply: Single-phase supply shown is for absolute maximum output of the Rotary Converter. Most of the time the converter is oversized to provide the high starting current for the motor. It is not always necessary to use single-phase breakers sized this large. See the following formula.  
Formula: Total three-phase amperage (running load amperage) the machine(s) will ever draw multiplied by 1.5 (extra single-phase needed to generate the third leg), then add the idle current of the Rotary Converter. That will give you the total single-phase amps that will ever be drawn from the single-phase lines. Size the single-phase breaker minimum 20% above that total amperage draw and size the wire accordingly. 

IMPORTANT:  This chart is simplified and cannot reflect the many types of applications possible. Contact GROMAX to verify your phase converter requirements. Also refer to APPLICATION NOTES for sizing considerations.

Larger Horsepower phase converter systems may be obtained by connecting multiple Rotary Converters in parallel. See Multiple Units Banked Together.


Single Unit Installation Illustration

R Series  is 208-230V single-phase  in and 208-230V three-phase out. 
RH Series  is 460V single-phase  in and 460V three-phase out.  
Higher line voltages or voltage sensitive applications, such as CNC equipment,  may require a Voltage Stabilizer.
If you have single-phase that is 208-230V and you need 460V three-phase out, or visa-versa, a transformer can be used to step the voltages up or down as required. Consult factory.
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Rotary Converter Installation Illustration


Multiple Unit Installation Illustration

 Multiple Units Banked Together
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R Series  is 208-230V single-phase in and 208-230V three-phase out. 
RH Series  is 460V single-phase  in and 460V three-phase out.  
Higher line voltages or voltage sensitive applications, such as CNC equipment,  may require a Voltage Stabilizer.
If you have single-phase that is 208-230V and you need 460V three-phase out, or visa-versa, a transformer can be used to step the voltages up or down as required. Consult factory.

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Multiple Unit Installation Instructions

A.

1,000 HP or more is possible by connecting multiple units together in banks as required. Potential output is limited only by adequate wiring size and your single-phase supply available. Consult factory for these options.
B.

Caution:  Special care must be taken to connect all T-1 lines and all T-2 lines together. Test run the individual units before connecting the T-3 lines together. Carefully measure the voltages between the different T-3 lines. It should not read more than 60V for the R Series, and 110V for the RH Series, but could read much less. This will ensure that you have proper phase rotation. Cross phasing will cause a dead short and possible damage.
C.

Fuses or magnetic starters should be sized for the individual converters and not for the total load.
D.

The converters may be started either individually to reduce line surge, or may be started simultaneously depending on the limitations of your single phase supply available.