GEA Grasso Manual page 40

Grasso
Refrigeration Division
2.4 Start up sequence
2.4.1 Single stage and booster piston compressor packages
Starting conditions fulfilled
Output — compressor motor on
Feedback — compressor motor on equals 1
'Motor feedback' timer active
Release of capacity control system
Booster pressure reached
A Single stage:
B Booster:
•
If (1) Starting conditions fulfilled
→
Then (2) Set output — compressor motor on
→
Then (4) Start 'Motor feedback' timer
→
Then (5) Set unloaded start
•
(3) Feedback — compressor motor equals 1
If
→
Then (4) Stop 'Motor feedback' timer
•
If (5) Unloaded start ended
→
Then (6) Release of capacity control system
or
•
(5) Unloaded start ended
If
and (7) Booster pressure reached
→
Then (6) Release of capacity control system
Chap. 2 - 4
Unloaded start
Release of capacity control system after unloaded start.
Release of capacity control system after that the booster pressure is reached.
638660E_chapter2.doc
Figure 2.4, Start up sequence for single stage (A) and booster (B) piston
compressor package
GRASSO SYSTEM CONTROL
01.2004/1