Blockage; Blockage Detection; Blockage Removal - Samson 5857 Mounting And Operating Instructions

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Annex A (configuration instructions)

16.4 Blockage

Note

The positioner can only detect a valve blockage after either an initialization ('Start-up and

configuration' section) or a transit time measurement ('Service' folder in 'Start-up' or 'Func-

tions') has been performed after the actuator is started up for the first time.

The positioner detects a valve blockage when the actuator stem extends and with absolute

travel adjustment by comparing the travel after the limit switch has been triggered with the

travel measured on initialization. If the comparison shows that the limit switch was triggered

too early, this indicates that there is a valve blockage. The red LED blinks:

− Blockage

Settings\Actuator\Blockage

Function

Blockage detection

When the Blockage removal function is active, the actuator stem extends and retracts 1 mm

at the adjusted stroking speed three times in sequence. The action is indicated by the yellow

LED (only when the Blockage removal function is active).

− Removing blockage

16-4

Off

Adjustment range

No, Yes

Off

Time in s

EB 5857 EN

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