Samson 3731-5, Монтаж и эксплуатация

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EB 8387-5 EN 79
Malfunctions
10 Malfunctions
Malfunctions are indicated on the display by
error codes. Section 12.4 lists possible error
messages and recommended action.
The error codes appear on the display corre-
sponding to their status classification set over
the condensed state (Maintenance required/
Maintenance demanded: , Maintenance
alarm: ). If 'No message' is assigned to
the error code as the status classification, the
error is not included in the condensed state.
A status classification is assigned to every
error code in the default setting. The status
classification of error codes can also be
changed as required using an operator soft-
ware (e.g. TROVIS-VIEW).
10.1 Emergency action
Upon failure of the air supply, the positioner
vents the actuator, causing the valve to move
to the fail-safe position determined by the
actuator.
The plant operator is responsible for emer-
gency action to be taken in the plant.
Emergency action in the event of valve or ac -
tuator failure is described in the associated
valve and actuator documentation.
Tip
11 Decommissioning and
removal
Risk of fatal injury due to ineffective explo -
sion protection.
The explosion protection becomes ineffective
when the positioner cover is opened.
The following regulations apply to installa
-
tion in hazardous areas: EN 60079-14
(VDE 0165, Part 1).
The process is disturbed by interrupting
closed-loop control.
Do not mount or service the positioner while
the process is running and only after isolat
-
ing the plant by closing the shut-off valves.
11.1 Decommissioning
To decommission the positioner before re-
moving it, proceed as follows:
1. Disconnect and lock the air supply and
signal pressure.
2. Open the positioner cover and discon-
nect the wires for the control signal.
DANGER !
NOTICE
!