Stroke Counter; Lead Breakage And Lead Short Circuit Monitoring - Pepperl+Fuchs FD0-VC-Ex4.FF Manual

"Period cyclic test"
The period of time for the cyclic functional test can be set between 10 secs and 7 days, 23 hours, 59 minutes
and 59 seconds. If the set valve position is not modified for this period of time, the device carries out a cyclic
functional test automatically.
6.5.8

Stroke counter

Prerequisite
The following is required for the stroke counter function:
• Parameterisation of "Actuator Fail Action" - section 6.5.3
• Parameterisation of "Sensor usage" - section 6.5.4
"Stroke Counter"
This function can be activated by setting the option "Stroke Counter" in parameter "Valve Monitoring". The
count in parameter "Stroke Counter" is always then incremented by one as soon as the valve has reached
the valve position "open" after having modified the reference value. This means, that a movement from
"open" to "closed" and back to "open" corresponds to a stroke.
This parameter can be initialised with a start value. The current count remains unaffected even after a volt-
age failure.
"Stroke Counter Limit"
A count can be entered as the limit value for the counter function. If the count of the stroke counter exceeds
the entered "Stroke Counter Limit" the alarm "Maintenance Needed Now" is generated. No alarm is given
if the "Stroke Counter Limit" is zero. Thus it is possible to count the number of strokes without releasing an
alarm for a limit value.
6.5.9

Lead breakage and lead short circuit monitoring

"Valve Lead Fault Monitoring"
Monitoring of the valve lead is switched ON if the option "Short Circuit Valve" and/or "Lead Breakage Valve"
are set in the "Valve Lead Fault Monitoring" parameter. Short circuit monitoring functions only with the aux-
iliary valve controlled as the switch-on and/or holding current is required to recognise the short circuit. If the
auxiliary valve is deactivated before the lead fault is eliminated, the associated alarm is reset only if the
valve is controlled again and no short circuit occurs.
The cyclic functional test enables also a periodic lead shot circuit monitoring with a normally not
controlled auxiliary valve.
"Sensor Lead Fault Monitoring"
Monitoring of the sensor lead is switched ON if the option "Short Circuit Sensor" and/or "Lead Breakage
Sensor" are set in the "Sensor Lead Fault Monitoring" parameter.
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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