KROHNE Summit 8800 Vol 2 - Manual (Page 151)

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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 VALVES 11
11 .1 Analog
A 4-20mA output will be used to control the valve. This value can be set either viamodbus or via
the front panel of the flow computer.
Figure 159 Analog valve
Keypad value Value used if no set point is set.
Maximum output The maximum valve opening percentage for 20 mA. Normally 100%: open.
Minimum output The minimum valve opening percentage for 0 mA. Normally 0%: closed.
NOTE: Maximum and minimum values can be configured to prevent the output either fully open-
ing or fully closing by setting the limits within the band set when configuring the output.
Please note that the actual hardware connection must be defined as an analog output in the
hardware section (see volume 1).
The actual control of the valve must also be defined (see also volume 3):
• As a fixed keypad value, entered above
• In the modbus list to remotely control the value
• On display to locally control the valve
Select the control ID as follows:
Figure 160 Analog valve setpoint
The valve output is configured as an analogue output.