CELLmatic 1502 – GSV/GSF
Issue: 2.1
User Manual
08.02.2004
Page 10 of 51
Thy
-
tronic
I/S – Bjørnevej 8c – DK 7700 Thisted – Tel.: +45 97982344 – Email.: [email protected]
CONNECTION BETWEEN CAPACITY AND VOLUME RATIO
The programme is operating with 3 values for capacity, output, C-abs and C-pos. To demonstrate the
connection between these values the below sketches indicate the regulation and control of the slide stop and
the slide valve.
With suction flange mounted on top of the compressor:
With suction flange mounted on the side of the compressor:
The slide stop (MSS) provides the lowest volume ratio, when in its outermost left-hand position. Conversely,
the highest volume ratio is obtained in the outermost right-hand position. The actual position is measured by a
sliding potentiometer (POT 1).
As far as the slide valve (MSV) is concerned, the lowest capacity is obtained, when the piston is in its
outermost right-hand position. A 100% capacity is obtained when the slide valve is run so far to the left that it
runs against the slide stop. The position is measured by means of a rotary potentiometer (POT 2) or a sliding
potentiometer.
The slide valve has its longest travel when the slide stop is in a outermost left-hand position. For all other
positions of the slide stop, the travel of the slide valve will be shorter.
The longest possible travel of the slide valve is called the absolute travel, C-abs, and goes from 0 to 100%. The
value can be read in the display 2 picture.
The actual travel, C-pos, which is dependent on the position of the slide stop, goes also from 0 to 100%. The
value can be read in the MANUAL picture or in the display 4 picture.
The output is a calculated value indicating the partial load at which operation is taking place. The calculation is
performed on the basis of the relative position and the actual volume ratio. The output can be seen in the initial
picture.
