FASTERHOLT GT12, User Manual & Spare Parts Catalogue

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Combining the various constants: Combining the various constants:
The machine will always be able to run with the factory-set constants. However, there will be diff erent condi� ons
from farm to farm and from machine to machine. Many requests can be met by changing the constants.
1. Slow start-up of turbine. Set machine data no. 13 ini� ally to approx. 2-4. 1. Slow start-up of turbine. Set machine data no. 13 ini� ally to approx. 2-4.
This causes the speed regulator valve to close only about halfway, a� er which con� nued closing is performed in steps
un� l the rewind speed reaches the set speed. The valve can then be fi ne-tuned to close fi rst to the point where the
turbine starts running and then to close in steps un� l the set speed is achieved.
2. Slow opening of inlet. Set machine data no. 17 to 1. 2. Slow opening of inlet. Set machine data no. 17 to 1.
Opening for the water is then performed in steps.
3. Only one motor for speed regula� on. Set machine data no. 12 to 0. 3. Only one motor for speed regula� on. Set machine data no. 12 to 0.
Post-irriga� on starts once the turbine stops, when the magnet at the stop sensor is aff ected. A� er the post-irriga� on
� me has elapsed, the machine will restart and move to the mechanical stop.
4. Start up no. 2 machine when no. 1 stops. Set machine data no. 12 to 0. 4. Start up no. 2 machine when no. 1 stops. Set machine data no. 12 to 0.
With a pressostat installed on both machines, set the pressostats between the machine's opera� ng pressure and the
pump pressostat's stop pressure. For example, the opera� ng pressure may be 6 bar and the pump stop 9 bar. Set the
pressostats on the machines to 7.5 bar. No. 2 machine will then start up when the slow closing of the fi rst machine
reaches the point where the pressure in the ground line reaches 7.5 bar. Be aware that if the height diff erence of the
fi elds is too great, the required pressure diff eren� als that the pressostat must be set to may be too great.
5. The machine should stop due to low pressure and with a pressostat installed. 5. The machine should stop due to low pressure and with a pressostat installed.
Set constant no. 6 to 1 and set machine data no. 12 to 2. Set constant no. 6 to 1 and set machine data no. 12 to 2.
This means that the stop valve opens instead of closing if the line connec� on to the stop valve is the same.
A� er 2 minutes, close it again, otherwise you will not be able to obtain pressure at start-up. When machine data 12 is
set to 2, the valve can only be opened with the stop sensor, stop bu� on and monitoring. But not when the pressostat
is switched off .