Malfunctions; Emergency Action; Decommissioning And Removal; Decommissioning - Samson 3731-5 Mounting And Operating Instructions

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:
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.
Tip
Emergency action in the event of valve or ac-
tuator failure is described in the associated
valve and actuator documentation.
EB 8387-5 EN
, Maintenance
11 Decommissioning and
removal
DANGER
!
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).
NOTICE
!
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.
Malfunctions
79