Custom Setup with a PTO water pump electrically driven and pressure regulated.
With this project a powerful PTO pump (or other devices) for tractors can also be driven by electricity.
Especially for stationary uses it is not practical to be dependent on a tractor powering this kind of pumps.

Also the idea of operating the pump only as fast as necessary made this project very interesting and useful.

Specification

• Power supply: 3 phase 400 V
• Power: 4 kW
• Max. Pressure: 25 bar
• Flow rate:
  • Low pressure: 180 l/min
  • High pressure: 70 l/min
• Ports:
  • Output
    • 3x Geka
    • 3x Storz D
    • 1x Storz C
  • Input
    • 1x Storz C
• Control Interface:
  • Potentiometer (at pump)
  • Web interface (wireless)

Components

Mechanical

• Belt drive
• Water tank
• Pressure release valve

Pump

• Name: ML 20
• Power: 4 kW
• Rotational speed:
  • Max: 700 rpm
  • Rated: 540 rpm
• Connection: 1 3/8”, 6 Tooth PTO shaft
• Max. Pressure: 25 bar
• Flow rate:
  • Low pressure: 180 l/min
  • High pressure: 70 l/min

Motor

• Power: 4 kW
• Rotation speed: 1415 rpm
• Voltage: 380 V
• Frequency: 50 Hz
• Type: Three phase asynchronous motor

Control

• Custom Stripboard with ATMEGA 8 microcontroller
• 7.5 kW variable frequency drive (VFD)
• Pressure sensor 0-30 bar
• Method: The microcontroller controls the frequency of the VFD thus regulating the desired pressure with varying the rotation speed of the motor

Videos

First test

2018.05.11

Gallery