GEA Grasso Manual page 38

Grasso
Refrigeration Division
Operation modes
Name
11 Remote + Net-Net.SP
2.2 Explanation of symbols and characters used
Progression of a signal with time or information
Progression of a signal with time or information, the pre-event
Progression of a signal with time or information, the future is
Time at which a cause or condition begins (in text "• if..")
2.3 General starting conditions
The following conditions have to be fulfilled to begin start up of the compressor unit:
•
If
and
•
If
and
•
If
and
•
If
and
•
If
and
•
If
→
Then
Chap. 2 - 2
Explanation
Start/stop via network (MPI or Profibus-
DP) from a remote Master controller.
The capacity control is based on a
remote set point that is sent via the
network also.
Start command, e.g. 'external on' input equals 1 for operation mode 4 through 6
the 'start to start' timer is not active
the 'stop to start' timer is not active
no start limitation is active, e.g. Oil temperature too low, suction pressure too low or
discharge pressure too high
the digital input 'start release' equals 1
no alarms are active
the starting conditions are fulfilled
638660E_chapter2.doc
history is irrelevant
irrelevant
Effect
(in text „→ then..")
Figure 2.1,
GRASSO SYSTEM CONTROL
Signal for...
Start/Stop Capacity +/-
Network set
Network
point
Explanation of symbols and characters
used
01.2004/1