3
2
1
ALU tube
Fig. 26: Long-stroke capacity rod transmitter for SAB 283 Mk1
Fig. 27: Short-stroke capacity transmitter for GST, GSV and RWF from Gram Refrigeration and
short-stroke volume transmitter for GSV, RWF, SAB 283 Mk1 and SAB 355 Mk1
Fig. 28: Long-stroke capacity rod transmitter for SAB 193-233-283 and SAB 355.
Transmitter cannot be calibrated.
Fig. 29: Short-stroke capacity transmitter on SAB 120 and SAB 151.
Short-stroke volume transmitter on SAB 193-233-283 and SAB 355. Transmitter cannot be calibrated.
7.5.1 Calibration procedure for position transmitters
The procedure for calibrating minimum and maximum position is the same for all transmitter
types. In the following, the procedure will be described for compressors with manual Vi, com-
pressors with automatic zero point and finally compressors with automatic Vi adjustment. Cal-
ibration of the specific transmitter type is described in subsection 7.5.6. to 7.5.12. Software
calibration is described in subsection 7.5.13.
7.5.2 Capacity slide adjustment, manual Vi
Note: The capacity transmitter must be adjusted every time the manual adjustable Vi posi-
tion is changed.
Start the compressor in Manual and make sure that the capacity slide is in minimum. Adjust
the minimum position on the transmitter. Now bring the capacity slide to its maximum posi-
tion (i.e. when the current consumption is no longer rising) and adjust the maximum position
on the transmitter. Return the slide to minimum and check.
To make sure that the slide is in maximum physical position (Unisab III does not allow the ca-
pacity button to be activated after reaching 100% indication in the display) it is recommended
to set Cap. 100% Adjustm. at -10% after 100% calibration of the transmitter has been com-
pleted. See subsection 7.5.13. The slide indication in the display must now be 90%. If capaci-
ty can be increased further either automatically by Unisab III or by pressing the
F2
/CAP. UP
button, the slide has not yet been calibrated correctly. (Note that it may be necessary to
check if power consumption increases as it cannot be assumed that the transmitter can sup-
Calibration
240/319
Engineering manual - Unisab III 1.10
001930 en 2014.09
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