GEA Grasso Manual page 58

Grasso
Refrigeration Division
2.7.2.10 High discharge pressure alarm
The high discharge pressure alarm function is illustrated in the following diagram.
P Discharge pressure
dis
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
Disch press
Pdis hi alarm
High warning -
<< Limit values 01
Chap. 2 - 22
Figure 2.26, High discharge pressure alarm
Disch press:
Pdis hi alarm:
High warning:
>>
638660E_chapter2.doc
Actual discharge pressure in bar (a)
Alarm limit for maximum discharge pressure in bar (a)
Enter the warning value as an offset to the alarm limit in
bar
GRASSO SYSTEM CONTROL
01.2004/1