Does anyone have an idea to make maximum rotating speed to the TwisTorr turbo pump?

We are using the turbo pump to the helium circulating system.

We decrease the system's temperature by helium circulating. So, pumping power is very important to me.


The working condition of the pump is tough because it is not a one-way vacuum, always circulating at 1E-1 to 1E-2 order helium amount.

We used Turbo-V 1001 Navigator and Turbo-V 551 Navigator pumps for a very long time.

Previous those pumps work the maximum rotating speed with a high current( ~ 3 A) and we got enough power to the system.

But the new turbo pump TwisTorr 404 FS working a little bit different with previous pumps.

When we start the pump, it reaches the maximum speed at the STARTING mode and then changes the mode to HFLOW.

The problem is with HFLOW mode, the mode allowed a maximum current ~ 2 A so automatically decreases the rotating speed by the current.

It decreases the pumping power to the system and we cannot reach the base temperature anymore.

So, I want to get a maximum rotating speed with a higher current.


Does anyone have an idea to automatically or manually makes maximum rotating speed to the new turbo pump?

  • The "HFlow" is unique to the Medium Turbo Controller used with the 404FS Turbo Pump.

    From the User manual (page 246):

    Power Derating Function
    An enhanced power derating is implemented to provide the following benefits:
     Immediate auto-detection of changing requirements in the application.
     Dynamic TMP performance adapting to application conditions for customer’s process stabilization and speeding-up.
     Always the best “tuning” for TMP pumping technology taking the complete advantage of TwisTorr technology potential.
     Pump components minimized stress by mean of continuous TMP parameters tuning for extended reliability.


    The enhanced power derating dynamically adapts per the following functioning parameters:
     Gas type load (selectable WIN 157: see the following "Window Meanings" paragraph).
     Cooling mode (selectable WIN 106: see the following "Window Meanings" paragraph).
     Actual Body temperature (can be read by WIN 222).
     Actual Driving Frequency (can be read by WIN 203).


    Try changing the the gas type (Ar or He) configuration to see if it prevents this from occurring.

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