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Pressure switch control

Pump axis adjustment

About cavitation

 

 

Pressure relay adjustment

 

 

Warning: Before making any adjustment, make sure power is off.

Take off the cover, locate adjustment screw A and pressure difference screw B (see Figure 1)

 

To set the turn-on pressureTo decrease pressure, turn screw A counter clockwise. To increase pressure, turn screw A clockwise. Area of differential pressure remains unchanged. Turn on the pump and check turn-on and turn-off pressures by using a manometer.

 

To set the turn-off pressure:

To decrease pressure, turn screw B counter clockwise. To increase pressure, turn screw B clockwise. Area of differential pressure expands or shrinks accordingly. Turn on the pump and check turn-on and turn-off pressures by using a manometer. If necessary, repeat pressure setting procedures until the desired result is achieved.

 

Before turning on the power supply, pressure relay cover must be put on!

To reduce pressure fluctuation in plumbing system, you can use screw B to decrease area of differential pressure.

Recommended presure difference between minimum and maximum in the system is 1,5-2 bar.

 

 


 

 

 

Pump axis adjustment


Benefit of pump axis adjustment for electric motor and pump.


 

 





Cavitation

 

The lowest pressure forms at inflow to scoop wheel. Due to this under certain conditions liquid may start boiling. The bubbles (cavities) that have formed enter the scoop wheel and get compressed there. This compression of bubbles is called cavitation. During cavitation a high pressure at locations of compression of bubbles is formed. This phenomenon may cause great damage to pump parts: scoop wheel, bearings, etc.

Cavitation usually is the consequence of inappropriate selection of the pump.

Cavitation causes damage to scoop wheels by eroding the material and connections.

 

 


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