KROHNE Summit 8800 Vol 2 - Manual (Page 127)

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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 RUN SWITCHING 07
The capacity limits are based on a percentage of the high and low flow as entered in the flow
rates and totals page of the stream.
NOTE: Each stream must be assigned a different priority.
7 .3 .2 Valve control
Run switching can automatically open and close the following valves of a stream:
• Inlet valve
• Outlet valve
• Prover valve
Please note that these valves are specifically used for run switching and do not need to be con-
figured anywhere else and that they are independent of any valve used under “Valves”.
For each of them the following configuration is needed:
Figure 128 Stream run switching valve control
Control valve Control setting for the
stream valve
Not used
The valve will not be used by run switching
Monitored Run switching will only monitor, not control the valve.
Fully controlled Run switching will actively control the valve
Alarms Select whether an alarm should be given when the valve cannot
be switched. This is particularly important when control valve
is monitored.
Open/ close duration keypad Length of time the open and close the valve signal is sent
Transition duration keypad The maximum time the valve may move before an alarm is
raised
7 .3 .3 Flow control valve
A PID valve per stream to control the flow of the medium based on PID setpoints. Please note
that this valve is specifically used for run switching and does not need to be configured any-
where else and that it is independent of any PID valve used under “Valves”.