Engineering manual - UniSAB III 1.10.8
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001930 en 2021.06
3.7 Compressor control - adjusting slide speed
(screw compressors with hydraulic slides)
.................................. 150
3.7.1 Capacity slide................................................................... 150
3.7.2 Volume ratio slide ............................................................. 150
3.8 Compressor control - variable zero position (screw compres-
sors with hydraulic slides)
......................................................... 151
3.8.1 General............................................................................ 151
3.8.2 Corrected capacity............................................................ 151
3.8.3 Automatic setting of new zero point (SAB 202) .................... 152
3.8.4 Manual setting of new zero point (all screw
compressors)
................................................................... 152
3.8.5 Built-in spacer block .......................................................... 153
3.8.6 Capacity error shutdown.................................................... 153
3.8.7 Configuration.................................................................... 154
3.8.8 Zero pos. picture............................................................... 154
3.9 Compressor control - electrical slide control ............................... 155
3.9.1 Electrical slide control ....................................................... 155
3.9.2 Part load and full load........................................................ 155
3.9.3 Calculated Vi position........................................................ 155
3.9.4 Change to full load ............................................................ 155
3.9.5 Change to part load........................................................... 155
3.9.6 Position indications ........................................................... 156
3.9.7 Slide brake control ............................................................ 156
3.9.8 Capacity shutdown ........................................................... 156
4. History............................................................................................... 157
4.1 Shutdown list........................................................................... 157
4.1.1 Shutdown......................................................................... 157
4.1.2 Numbering of inputs/outputs .............................................. 159
4.1.3 Number of shutdowns ....................................................... 162
5. Service .............................................................................................. 163
5.1 Maintenance............................................................................ 163
5.1.1 Service timers .................................................................. 163
5.1.2 Compressor maintenance (screw and reciprocating) ........... 163
5.1.3 Drive................................................................................ 168
5.1.4 Remote monitoring ........................................................... 169
5.1.5 Trend information.............................................................. 171
5.1.6 Event e-mails to user ........................................................ 172
5.2 Diagnosis ................................................................................ 173
5.2.1 Hardware ......................................................................... 173
5.2.2 Software .......................................................................... 176
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