Samson 4785, Mounting And Operating Instructions

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4. Operation
Warning!
Before putting the positioner into
operation, carefully move the con-
trol valve to its final position by
covering the hole (manual oper-
ation) on the cover plate (Fig. 11).
Check whether the lever mechanism
functions properly.
If the maximum angle of rotation is
exceeded by selecting the wrong
lever mechanism or by sizing the
mechanism improperly, the posi-
tioner may be destroyed.
4.1 LED controls
Two LEDs located inside the cover serve to
monitor the positioner, indicating the posi-
tioner’s status during maintenance proce-
dures, operation and in the event of defects.
The colors generally indicate the following
Red Start-up or error,
control operation impossible
Green No error recognized,
control operation or fail-safe action
(e.g. if not initialized)
Red + Green Error recognized,
control operation possible
For details, refer to the table below!
Description LED
Device start-up: Red lights up
No error:
Device on the bus, cold start executed,
initialization required
Initialization or zero adjustment in operation
Device initialized, no valid set point
Device initialized, valid set point, operation
Green, generally
Green blinks slowly
Green blinks quickly
Green blinks 3 times q long pause
Green lights up
Error during control operation:
Zero point error
Control loop error
Red and green
Red and green blink slowly
Red and green blink quickly
Errors causing the abortion of the first initialization:
(device does not proceed to standard operation)
Zero point error
Error in the mechanics/pneumatics section
Control loop error
Red, generally
Red blinks slowly
Red lights up
Red blinks quickly
Errors causing control operation to be exited:
Device recognized internal error Red blinks 3 times q long pause
32
EB 8382-2 EN
Operation