KROHNE Summit 8800 Vol 2 - Manual (Page 155)

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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 VALVES 11
The PID valve output is configured as an analogue output.
Figure 166 Select the PID valve ID and the Preset keypad setpoint ID
11 .4 Feedback
For most vaves is is important to know if they realy opened or closed after a command has been
given. Limit switches can be mounted or for electrical valves signals are generated in the cirquit
to have two digital status feedback signals: one for open, one for closed.
Feedback valves can be opened and closed by two individual digital status outputs.
The SUMMIT will check if these signals are set within a specified period after a control signal is
given.
Figure 167 Feedback valve
Open and closed duration keypad The length of time the corresponding command is sent.
Transition duration keypad Maximum time allowed for the valve to move before a feedback
signal should occur.
Use valve alarms Select if an alarm must be generated if the transition time is
exceeded.