Can a 3-phase 480V 60Hz motor run on a 380V 50Hz power supply?

If I run a 3-phase motor rated 480V 60Hz on a 380V 50Hz power supply what will happen in terms of permanent damage?

There are a couple of relationships to remember about voltage, frequency, speed, and current.
50Hz 60Hz Motor
For 3-phase designs, speed is proportional to frequency (and inversely to pole count). The governing equation to determine “synchronous” speed is:
120 * (poles) / (hertz) = (revolutions per minute). For squirrel cage induction, the actual speed will be slightly lower, due to the effects of slip.

When attached to a given load, the motor will try to produce power (defined as the product of volt and ampere, or more commonly “watt”) according to the process logic. This means that for a machine nominally rated 480v 60Hz, operating at a lower voltage like 380v 50Hz may well mean it attempts to draw (480/380)* it “normal” rated current. This is guaranteed to result in severe thermal damage, if left this way for any appreciable time.
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Frequency Converter Troubleshooting

Damages on Modules
The frequency converter power modules mainly contain IGBT, IPM, etc. Check whether the shell has been broken, and check the connection between terminals and the printed circuit board to see if there are signs of erosion. With a multimeter to check whether the current is turned on, or measure the resistance inconsistencies, as well as the power device gate drive resistors if there are inconsistencies, in order to determine which power devices is damaged.
Frequency converter troubleshooting
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Basics of Frequency Converter Circuits

Frequency converter can transform AC mains through AC→DC→AC conversion and output pure sine wave power. It is mainly used in electronic devices with induction motor speed regulation. It is also an important device producing changeable voltage and frequency. For the adjustable frequency and voltage inverter, we call frequency converter. There is so much about the frequency converter, knowledge of the frequency converter circuits will be more numerous and complex. Here are several basic introductions about frequency converter circuit.
Frequency Converter Circuit Block Diagram
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Benefits of Using a Frequency Converter

Apply frequency converter for motor speed control, it can vary the motor speed based on actual applications, and save energies. It is mainly based on the following factors:

  • Frequency Control System should have low self-loss and high efficiency;
  • The motor is always kept at a low slip running, reduce the rotor losses;
  • It can achieve a soft start and brake function, reduce the starting current impact.

When using frequency converter control, it should be consider from the process requirements, efficiency savings, payback period and other prospects. If only consider the benefits of technical requirements and energy savings, the following situations will be more favorable to use frequency converter control:
According to process requirements, the production line or single piece equipment is required by the program or motor speed. Such as: packing machine conveyor system, according to different kinds of products, you need to change the system transmission rate, and can use the converter speed control system to realize implement process control.
Benefits of Frequency Converter

Use frequency control instead of mechanical transmission, such as: machine tools, not only can save the complex gearbox, but also precision progress to meet the process control requirements.

Use frequency control instead of the gate or barrier to adjust the flow. This is suitable for fans, pumps, compressors. For example: boiler pump, blower and fan. frequency control not only can save the servo amplifier, power steering, electric actuator and the water supply valve (or the windshield), and makes the whole boiler control system has a faster dynamic response, high control accuracy and stability.
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Replace Frequency Converter Spare Parts to Ensure its Service Life

Long time use of frequency converter will lead to lower quality and efficiency, resulting in serious impact on the equipment. So we not only need to regularly replace the spare parts of the frequency converter, but also need to know the correct way of replacement, in this way we are able to ensure the quality and service life. Now we will introduce you the replacing method of frequency converter spare parts.
Frequency converter maintenance

Filter Capacitor
Filter capacitor also known as electrolytic capacitor, which mainly used to absorb low-frequency harmonics in the DC power supply, in order to smooth DC voltage. If the filter capacitor continuous operation for a long time, the heat generated will let the electrolyte dry faster, affect the capacity. Filter capacitor life under normal circumstances is five years. If you want to effectively guarantee the frequency converter service life, it is recommended to periodically checking once a year. Generally, if the capacity reduction is more than 20%, it will need to be replaced.
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Frequency Converter Development History

Frequency converter is a general name, more accurately name is AC power frequency converter. The entire development history of frequency converter is the development of electronic devices.

Before and after the 1980s, electronic frequency converters are mainly made in Japan. Such devices use more power crystal enlarged manner making, after 80s Chinese mainland introduce frequency converter from Taiwan. Power characteristics of this period are: small power capacity, accuracy, and low efficiency.
GoHz Frequency Converter

1980s, China embarked on the road of reform and opening, at this stage, import and export facilities in mainland China gradually increased. Particularly, increase of the microwave oven and air conditioning appliances are representative share of exports, so it demands frequency converter for testing. The market demand for the original product cannot meet the power, so that power supply manufacturers seek new technologies to expand the market. According to the technical conditions and electronic devices, the manufacturers mainly develop in two ways, one is to maintain the same crystal-like style and apply multi-parallel manner for expansion; another way is to use the power transistor modules.
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The Danger of Running 60Hz Motor on 50Hz Power Supply

At present, most European & Asian countries’ civilian standard AC voltage is single phase 220V (230v, 240v), 50Hz (single-phase two-wire, power frequency 50 Hz), industry standard is three-phase 380V (400v, 415v, 420v), 50Hz (three-phase four-wire system, three-phase three-wire system).
50Hz 60Hz Countries

United States and Canada AC power supply frequency are both 60Hz, according to American National Standard For Electric Power Systems, commonly used single-phase and three-phase electrical system as follows:

Civilian use 110 – 120V 60Hz single phase three wire system. There is a neutral line, the voltage between the neutral and the other two lines is 120V 60 Hz, and the voltage between the other two is 240V 60 Hz (neutral line and ground line are separated). 110-120V 60Hz single phase three wire system can be made 120V 60Hz single phase voltage power supply for low-power handheld and mobile devices, such as power tools, lamps, fan and other appliances. It can also be provided to small machinery 240V 60Hz single phase voltage equipment. Due to the reasons for the access side of substantially, 110v-120V, 240V standard power supply voltage will drop to 110V and 230V.

Industrial use 460v – 480V 60Hz three phase four wire system, 277V three phase four wire system: Single-phase voltage is 277V, phase voltage is 480V. So the industrial three-phase power is divided into two voltages, respectively 230V three-phase four-wire and 480V three-phase four-wire system. Electric power tools and motor-based machines sold in the United States usually labeled as a single-phase 110V 60Hz, single phase 230V 60Hz, three-phase 230V 60Hz and three-phase 480V 60Hz.

For example, a single phase 230V 60Hz motor-based equipment on the US market, if you run it on single phase 220V 50Hz power supply, then there will be serious problems occur, which will affect the motor quality directly, reduce the motor life, leading to the motor’s capacitors burning or even exploding.
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Frequency Converter Technical Requirements

Frequency converter total rated capacity: 6000VA
Input single-phase AC: 220V±10%, output three-phase four-wire symmetrical power (per phase rated power 2000VA), requires power supply with twice overload capacity in short time.

Frequency converter dielectric strength: shell, voltage output terminal and ground shall be subjected to frequency AC 3000V, which lasted one minute and not being breakdown.
Frequency converter assembly
Output frequency
Three gear fixed output frequency: 40Hz, 50Hz, 60Hz; frequency accuracy should guarantee±0.05%.
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Difference between 50Hz and 60Hz power supply

Why some countries are using 50Hz power supply, while others use 60Hz? What are the advantages and disadvantages of 50Hz and 60Hz power? Do they have effect on the load power?

In fact, the difference between 50 Hz and 60 Hz is not so great, there are no substantive issues. However, the rotational speed of the generator is slightly different. Select 50Hz or 60Hz, in a country, there always is the same except Japan. One thing should be concerned is, why using 50Hz or 60Hz, but not higher or lower frequency.
50Hz vs 60Hz

In the electrical system, the frequency is a very important element which should not be determined arbitrarily.

People sum up the theorem as, periodically changing the direction of current is called alternating current (AC). Generating a periodically varying of time is called frequency, which is measured in hertz (in commemorate the contribution of Hertz). Alternating current frequency is 50 or 60 Hertz, the direction of the current change 50 or 60 cycles per second, the number of changes per second is 100 or 120 cycles.

The frequency is determined by generators, motors and transformers such as construction, materials and so on.

50 Hz bipolar generator synchronous speed is 3000rpm, and if the frequency is doubled to 100 Hz, the synchronous speed will be 6000rpm. This high speed will brought many problems to the generator, especially the line speed of the rotor surface can be too high, which will greatly increase the capacity limit. In addition, from the use of perspective, the frequency is too high, so that the reactance increases, electromagnetic loss, exacerbated the amount of wasted effort. For example, three-phase motor current will be greatly reduced, output power and torque also declined significantly, there is no benefit. In addition, if a lower frequency such as 30 Hz, transformer efficiency is low, it will be detrimental to the AC transformer and transmission.
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Difference between Frequency Converter and Variable Frequency Drive

Frequency converter is constituted by the entire circuit AC-DC-AC-filter converting device, it has been widely used. Frequency converter not only can analog output indicators of different countries, but also provide clean and reliable, low harmonic distortion, high voltage and frequency stability in the design, development, production, testing and other applications sine wave power output for export of electrical manufacturers. Frequency converter is very close to the ideal AC power grid voltage and is able to output the network voltage and frequency of any country. Variable frequency drive is organized by DC-AC-AC (modulated wave) and other circuits. Its output voltage waveform is a square wave pulse and harmonic component. The voltage and frequency vary in proportion and cannot be adjusted. It does not meet the requirements of the AC power supply.
Variable Frequency Drive vs Frequency Converter
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