GEA Grasso - Page 58

Grasso
Refri
g
eration Division
GRASSO SYSTEM CONTROL
Chap. 2 - 22 638660E_chapter2.doc 01.2004/1
2.7.2.10 High discharge pressure alarm
The high discharge pressure alarm function is illustrated in the following diagram.
P
dis
Discharge pressure
A.. Time characteristic of the
discharge pressure
V.. Forced reduction of the capacity
due too high discharge pressure
B.. High discharge pressure limitation
active
T.. Limit timer active; After that this
timer has expired the capacity
control is enabled again and the
compressor capacity can be
increased.
b.. Limit value for disabling capacity
increase
f.. Limit value for forced reduction of
capacity
W.. Warning limit
Al.. Alarm limit
ML W.. Warning active
ML A.. Alarm active
3.. Reset of the active alarm
Figure 2.26, High discharge pressure alarm
Disch press 
Pdis hi alarm 
High warning - 
Disch press: Actual discharge pressure in bar (a)
Pdis hi alarm: Alarm limit for maximum discharge pressure in bar (a)
High warning: Enter the warning value as an offset to the alarm limit in
<< Limit values 01 >> bar