Partial Valve Stroke Test (Pvst) - AUMA ACVExC 01.2 Series Operation And Setting Manual

Actuator controls
ACV 01.2/ACVExC 01.2
9.9.

Partial Valve Stroke Test (PVST)

Characteristics
Requirements
Example
Information
Operation commands
After having unlocked the EMERGENCY stop button, a possibly active operation
command will NOT immediately be re-activated, but only respective acknowledgement
by the operator. This resets the EMERGENCY stop status.
The acknowledgement is made:
via the RESET push button in selector switch position Local control (LOCAL).
via a digital input from Remote. Assignment: RESET
The Partial Valve Stroke Test (PVST) is used to check the function of both actuator
and actuator controls. During this test, the function of the valve is tested by means
of partial opening or closing within a defined period of time without interrupting the
process. After successful testing, actuator controls operate the actuator to its initial
position.
If the test was not successful, actuator controls will generate the following signals:
PVST fault PVST abort For monitoring the PVST, these signals must be evaluated
by a PLC.
Position transmitter in the actuator
Function <Positioner> activated.
If the actuator is in safe state (caused by the failure behaviour), the test will not
be performed.
The test can only be performed during OPEN - CLOSE control. For setpoint
control (modulating duty), a test cannot be performed.
For the change-over, a digital input for the signal Execute PVST has to be available
and configured.
Configuration of digital input
Required user level: Specialist (4).
Device configuration M0053
I/O interface M0139
Digital inputs M0116
Use input DIN 5 for Execute PVST signal :
Parameter: Signal DIN 4 M0118
Setting value: Execute PVST (wiring diagram designation:
The logic for the digital inputs may be inverted. Depending on the parameter setting
(e.g. Coding DIN 4 M0126), the input is either High active or Low active. For safety
reasons, the Execute PVST signal input is generally set to Low active.
Execute PVST via digital input
Switching behaviour for coding Low active:
Input Execute PVST = low level (0 V DC or input open)
No test
Input Execute PVST = high level (standard: +24 V DC):
Test is initiated
Execute PVST manually via push buttons of the local controls
Required user level: Specialist (4) or higher.
Device configuration M0053
Service functions M0222
Execute PVST M0850
The actuator is within the set stepping range. The initial position depends on the
settings of the following parameters: PVST behaviour M0853, PVST stroke M0854
Failure functions
ESD )
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