MLU / MLK low-voltage three-phase premium efficiency induction motors 0.75–375 kW
Country: Japan · Model: MLU / MLK
Low-voltage three-phase squirrel-cage induction motors of increased energy efficiency with a power of 0.75–375 kW. The MLK series has a steel frame and the MLU a cast iron one, both totally enclosed fan cooled, with a shaft height from 80M to 355K. The motors are installed on pumps, fans, compressors and conveyors.
- Series
- MLK (steel frame), MLU (cast iron frame) — premium efficiency; MLH — standard efficiency 0.2–0.4 kW
- Power
- 0.75–375 kW (premium)
- Shaft height (frame size)
- 80M–355K
- Voltage/frequency
- 200–400 / 200–400 / 220–440 V, 50/60 Hz
Technical specifications
| Series | MLK (steel frame), MLU (cast iron frame) — premium efficiency; MLH — standard efficiency 0.2–0.4 kW |
|---|---|
| Power | 0.75–375 kW (premium) |
| Shaft height (frame size) | 80M–355K |
| Voltage/frequency | 200–400 / 200–400 / 220–440 V, 50/60 Hz |
| Efficiency class | per IEC 60034-30 / JIS C 4034-30 (Top Runner, Japan); export versions IE2/IE3 for the EU (EU 2019/1781) |
| Degree of protection | IP55 (premium), IP44 (standard) |
| Insulation class | 155 (F) |
| Duty | S1 |
| Operation from a VFD | constant torque 0.5–60 Hz (1:120) for 4P up to 45 kW |
| Conditions | −30…+40 °C, up to 1000 m |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
For small powers of 0.2–0.4 kW there is the standard efficiency MLH series. The motors comply with the efficiency classes of IEC 60034-30 and JIS C 4034-30 and the Japanese Top Runner program introduced in 2015. For supply to the European Union a version under regulation EU 2019/1781 is made (IE2 for 0.12–0.75 kW and IE3 for 0.75–1000 kW) with CE marking, and the nameplate shows the class, efficiency and year of manufacture. Rated voltages are 200–400 V at 50 Hz and 200–400 or 220–440 V at 60 Hz, duty S1. Motors of this class have degree of protection IP55, insulation class 155 (F), and operate at temperatures from −30 to +40 °C at altitudes up to 1000 m. The terminal box is moved to the top, and the cable entry direction can be changed. In motors of frame size 250S and above the bearings are grease-lubricated with no replacement during maintenance. The manufacturer states a longer insulation life, noise reduced by 5 dB(A) on average, and preserved mounting dimensions of standard motors, which makes replacement easier.
How to choose
First determine the power and shaft height, because the starting method depends on the power. Direct starting is used up to 3.7 kW and from 75 kW, while 5.5–55 kW needs star–delta switching. If the motor will be supplied from a frequency converter, four-pole machines up to 45 kW work at constant torque in the range of 0.5–60 Hz (1:120) (FRENIC converters exist for such a drive). The steel frame MLK or the cast iron MLU is chosen by the mounting conditions.
Request a price and lead time
MLU / MLK low-voltage three-phase premium efficiency induction motors 0.75–375 kW. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What degree of protection and temperature range do the MLK and MLU motors have?
Motors of this class have IP55 and are suitable for outdoor installation. The permitted ambient temperature is from −30 to +40 °C, installation altitude up to 1000 m.
Do these motors meet EU energy efficiency requirements?
A version under regulation EU 2019/1781 with CE marking is made for the EU. It specifies IE2 for 0.12–0.75 kW and IE3 for 0.75–1000 kW.
How do the MLK and MLU series differ?
The MLK has a steel frame and the MLU a cast iron one. Both series are of increased efficiency, totally enclosed fan cooled, with a shaft height from 80M to 355K.
How should motors of different power be started?
Up to 3.7 kW and from 75 kW the start is direct. For the intermediate range of 5.5–55 kW star–delta switching is used.
Can the MLK and MLU motors be supplied from a frequency converter?
Yes. For four-pole motors up to 45 kW constant torque operation is available in the range of 0.5–60 Hz (1:120).
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