Cyclic Functional Test - Pepperl+Fuchs FD0-VC-Ex4.FF Manual

These parameters are set automatically when using the setup wizard. The current times of the
valve are set as the reference times. The maximum admissible deviation is set to 30 %. This
allowance can be adapted for each time individually to the plant specific conditions, if necessary.
Open
Closed
Open
Intermediate
position
Closed
Figure 6.4: Definition of breakaway and transit times
6.5.7

Cyclic functional test

Prerequisite
The following is required for the cyclic functional test function:
• Parameterisation of "Actuator Fail Action" - section 6.5.3
• Parameterisation of "Sensor usage" - section 6.5.4
• Time monitoring is activated - section 6.5.6
"Cyclic Test Open" and "Cyclic Test Closed"
The valve coupler is provided with the feature to check the connected valve for proper functioning during an
adjustable period of time. Thus it is possible to monitor a valve which is rarely triggered, for faults which
might prevent the latter from functioning properly. Here, the valve coupler controls the valve contrary to the
current control until breakaway of the valve is recognised, and then controls the valve back into the initial
position. The measured breakaway time is displayed as the breakaway time measured last, and falling be-
low or exceeding the admissible range of values is signalled as an alarm.
Depending on the operation, the cyclic functional test for the valve position "open" and/or "closed" can be
switched ON or OFF under the parameter "Valve Monitoring". However, this is possible only if "Time
Monitoring" is activated in the "Valve Monitoring".
Subject to reasonable modifications due to technical advances.
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Parameterisation and operation of the valve coupler
1 2
Fieldbus Valve Coupler FD0-VC-Ex4.FF
1 = breakaway time closed -> open
2 = transit time closed -> open
3 = breakaway time
3 4
4 = transit time ope
Copyright Pepperl+Fuchs, Printed in Germany
Setpoint
of valve
Valve
position
open -> closed
n -> closed