Bitzer Condensing Unit High Pressure

Hi,

have anyone experience with Bitzer Condensing Units with EC Ventilation?

I have one Condensing Unit with two EC-Ventilators and one 0-10V Speed Controller.
My problem is that the High Pressure rises quickly, the fan becomes 10V but the pressure rises to quick and the compressor cut off with high pressure.
In this point the EC-Ventilators are not on 100%.
The ramp from the Ventilators is too high.
It takes 17 Seconds with 10V to get the Ventilators to 100% that is to slow for the compressor.
High pressure cut out by 27 bars.
Anyone the same problem?

Greetings