DID-UM-002
Val Controls A/S
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Limfjordsvej 3
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DK-6715 Esbjerg N
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Tel. +45 7547 0600
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www.valcontrols.com
Revision: 10
12/74
6
Diagnostic
The IDC can perform tree different test types.
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Partial stroke test, PST
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Full stroke test, FST
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Solenoid test, SOT
Furthermore, the IDC can record signatures and record test data in case of emergency shutdowns.
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Emergency shutdown test, EST
6.1
Partial stroke test
The PST moves the system to a predefined position and back. The test can be initiated from the test
menu, a communication protocol or a digital input depending on the configuration.
The system will move the distance specified by “PST travel”. If PST travel is 20%, the actuator will
move from 100% to 80%.
To avoid overshoot, a function called “PST overshoot prevention” is enabled as default. During the
reference stroke, two partial strokes will be performed. The first partial stroke is used to measure
the overshoot which is then avoided in the second stroke. In all further PST will use this function.
Below are signatures from typical partial strokes shown, including definitions on the different terms
further used in this manual.
