Target Mode; Time Monitoring - Pepperl+Fuchs FD0-VC-Ex4.FF Manual

The default setting "Intermediate => Last" has the effect that during an opening and/or closing process the
last position is displayed until the valve has reached the reference position actually. This may be used e. g.
in a sequential control when one should wait in the chain of steps until the valve has reached the desired
position after being controlled. Then only the reference value must be compared with the feedback.
6.5.5

Target mode

The "target mode" determines the mode of operation of the valve coupler. The following settings are possi-
ble:
• OOS, Out of Service (default setting)
• Auto
• Man, Manual
In mode "Out of Service" the transducer block is deactivated and the valve output is not controlled. Thus a
connected drive moves in its mechanical safety position. This mode should be set if basic function param-
eters ("Actuator Fail Action", "Sensor usage" and "PV_D generation") shall be modified or if the channel
which belongs to that transducer block is not used.
The "Auto" mode is provided for operation. The transducer block operates in this mode as specified by pa-
rameterisation.
"Man" is used by the setup wizard and must not be modified.
6.5.6

Time monitoring

With the "Time Monitoring" activated, the breakaway and transit times of the connected valve are measured
and compared with the reference values during each reference value modification of the valve position. If a
measured time falls below or exceeds the associated reference time by a specified allowance an alarm is
generated. The times measured last are also displayed (see section 6.6.3).
Prerequisite
The following is required for time monitoring:
• Parameterisation of "Actuator Fail Action" - section 6.5.3
• Parameterisation of "Sensor usage" - section 6.5.4
Activation of time monitoring
Time monitoring is activated by setting the option "Time Monitoring" in parameter "Valve Monitoring".
Enter reference times
The reference times for the four different monitoring times are entered in seconds during commissioning.
For the definition of the breakaway and transit times please refer to figure 6.4.
Each reference value consists of the proper reference value in seconds and the maximum admissible per-
centage deviation. An alarm is generated if a measured time falls below or exceeds the admissible allow-
ance.
• Range of values of reference value of breakaway times: 0 s to 60 s
• Range of values of reference value of transit times: 0 s to 180 s
• Range of values, max. deviation: 0 % to 100 %
The accuracy of time measurement is +/- 0.05 s
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
Fieldbus Valve Coupler FD0-VC-Ex4.FF
Parameterisation and operation of the valve coupler
Copyright Pepperl+Fuchs, Printed in Germany
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