I´m from a rural area and mobile phone signal weakens a lot as soon as you leave your town. Spin the motor to be sure the bearings are good.

There are two basic types of phase converters on the market which will allow 3 phase motors to run using single phase input to the converter. ElectricProblems.com is a participant in the Amazon Services LLC Associates Program which is an affiliate advertising program that is designed to provide a means for sites to earn advertising fees by linking to Amazon.com. Table 1 can be used for guidance and is based on 3 phase, 220 VAC motors and 125% of motor nameplate current. Disclaimer. But even if you don’t have these meters, using the approximate values of run capacitors specified in this article the currents should be close and you will be able to get nearly full horsepower from your 3 phase motors. The fact I have a phase converter is even worse as it can change voltage with the incoming service.

Table 3. Sectigo and Green Hills Software Partner to Help Manufacturers Protect Endp. Minimum suggested wire size for low voltage drop. This also assumes the lifting... Hi, Giovanni, Thank you for your reply. I called the tech back once I got it this close and he still wasn’t exactly thrilled. The tech asked me to check my line voltages across L1-L2, L-2 – L3, and L1-L3. It was a lot harder than I thought. In figure 4, a 5 horsepower idler motor needed about 70 microfarads between the phases. You must be logged in to reply to this topic.

The output is custom balanced to meet the requirements of CNC equipment as well as other loads.
Also, the metal frame of the motors and your machines should be grounded. The coil for this relay is denoted 1R. A simpler alternative, which eliminates the separate start circuit and also eliminates the set of run capacitors between lines 2-3 is called a self starting phase converter. It is the radius of the shaft.... Hi Tobi, The rotary converter does not change voltages. The best way to size these is by trial and error using a clamp-on type ammeter on the 3 phase lines while the 3 phase motor is running.

The actual current depends on the size of the start capacitor and can be estimated using the following equation.

If a plug and receptacle is used to connect power to the equipment, this meets the disconnect requirement.

The self starting phase converter uses capacitance between only one phase (1-3) instead of using 2 sets as recommended here.

If you have equipment that starts with the motor loaded, such as an air compressor, then 1.5 times the motor horsepower would be recommended. The original diameter was 1.850 inches.
I considered buying an amplifier but they are quite expensive, so I started looking for a way to do it myself. There are two relays shown in the schematic below. The other two lines are left untouched. Figure 5 The second cut of 0.060 started from the 1.790 diameter and reduced it to 1.670.
Selecting the idler motor is the first step. The result of trying this with the same 5 horsepower phase converter is shown in figure 5. In a 3 HP converter of a different manufacturer, three 40 microfarad capacitors were used (120 microfarads total.). Safety should be your first concern and any electrical wiring should follow your local electrical code. The tech asked me to check my line voltages across L1-L2,   L-2 – L3, and L1-L3. Remember to add the currents of all devices that will draw power from this feed wire. Thus torque equals the weight of the rock times the radius of the shaft. The self starting phase converter uses the same set of oil filled capacitors for both starting and as run capacitors. ** Very Important! There are also mechanical (manual) contactors available with thermal overload protection as part of the switch. The run capacitors are optional. The video of the installation in the instruction manual in PDF is also included. I figured out it is because of how the capacitors are wired into the legs.

If a run of wire longer than 50 feet is used such as from the circuit breaker panel to the phase converter, choose the wire size to keep the voltage drop in the wire less than 3 percent. The idler is shut off by pressing the stop button which opens the circuit to the coil causing the contactor to open. The disconnect of the phase converter can often meet this requirement in home shops. If a motor near the size of the idler (which the static converter is sized for) is started, the start-up current can drop the line voltage for a fraction of a second and result in the start capacitor engaging. Assuming you are lifting the rock (the string stays vertical) the point at which the string joins the shaft does not move (with respect to the ground) so the lever arm is the horizontal line from the center of the shaft to that point. Since the phase converter is supplied with single phase power it can use a 2 pole disconnect or 2 of the 3 poles of a 3 pole switch. The use of time delay, cartridge fuses are common with motor circuits. For many shops the small amount of unbalance is acceptable and most commercial rotary phase converters are the self starting type. For guidance, the cost of a used 3 phase motor of 2 horsepower or less should be about $20; for larger motors use about $10 per horsepower. The single phase 220 VAC input is brought in on lines 1 and 2, labeled L1 and L2 in figure 1.

Even though we recommend products that we like, some of them are linked to our affiliate partners that will pay us a small commission at NO cost to you! Too little capacitance and the idler either will not start, or it will start very slowly. Yes. I’m going to purchase one other capacitor in an attempt to get it slightly closer. The other two legs I was able to obtain large voltage swings with capacitor changes. SiliconExpert provides engineers with the data and insight they need to remove risk from the supply chain. The converter will work fine without them, however you may only be able to get about 80% power from your 3 phase motors due to low current in the third line. The rotary phase converters are known to produce three-phase motor power without proving disastrous to the equipment and its functioning as it produces a well-balanced and distributed power supply.

This is a 208 volt machine so it can run from 200-220 volts. Thanks again in advance for your help! If the converter is properly sized, these voltages will remain in a balanced state over the entire range of connected loads. Prior to the transformer I have voltages of 236,237, and 232.


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