400 Hz Ground Power Units

Nidec Leroy-Somer, world leader in alternators from 10 to 35,000 kVA, has been manufacturing a range of special frequency products destined for the aircraft industry, for the last 30 years.
Expertise in design and manufacturing ensure that each Nidec Leroy-Somer product meets the technical requirements of this exacting application.
The 400Hz alternators are brushless, self-excited generators (Shunt excitation), with the D550 digital AVR fitted as standard.
They meet the principal international standards, notably: IEC 60034-1.

Electrical characteristics

• Voltage: 200V (L-L) / 115V (L-N) adjustable to ± 5%
• Insulation class H
• Power factor: 0.8
• Transient voltage dip ≤ 10% for 50% load variation
• Harmonic rate < 3% at no load
• Recovery time ≤ 500 ms
• D550 digital AVR specifications:
  - Voltage accuracy ± 1% on balance linear load
  - Under speed protection
  - Integrated radio interference suppressor
  - Mounted inside the terminal box 

Mechanical characteristics

• Single-bearing IM2005
• Two-bearing IM2001
• Steel frame and steel / cast-iron / aluminum end shields
• Cylindrical and standardized shaft end for two-bearing
• Sealed for life bearings
• IP 23 protection, self-ventilated alternator

Operating conditions

• Ambient temperature: -20°C and +50°C.
• Altitude up to 1000m

Option

• Radio interference suppressor