Table of Contents
Advertisement
Adjusting the switching point:
The limit switches are marked GW1 and
GW2 on the inside of the case cover. Yel-
low tags and the associated adjustment
screws (Fig. 11) are located below these
markings.
Each switching position can optionally be indi-
cated when the tag has entered the field, or
when it has left the field.
Move the valve to the switching position
and adjust the tag of the required limit
switch GW1 or GW2 by turning the re-
lated adjustment screw until the switching
point is reached. This is indicated by the
LED at the switching amplifier.
In so doing, one edge of the yellow tag will
be in alignment with the white, horizontal
line on the case cover. This indicates the
side from which the tag enters the inductive
field of the proximity switch.
To ensure safe switching under any ambient
conditions, the switching point should be ad-
justed to a value of approx. 5% before the
mechanical stop (OPEN - CLOSED).
5 Maintenance
The positioner is maintenance-free.
Pneumatic connection 9/Supply contains a
sieve with a mesh size of 100 µm. If re-
quired, the sieve can be unscrewed and
cleaned.
Please also observe the maintenance instruc-
tions for upstream pressure reducing
stations for supply air, if applicable.
6 Servicing explosion-protected
versions
If a part of the positioner on which the ex-
plosion protection is based needs to be ser-
viced, the positioner must not be put back
into operation until an expert has inspected
the device according to explosion protec-
tion requirements, has issued a certificate
stating this or given the device a mark of
conformity.
Inspection by an expert is not required if the
manufacturer performs a routine check on
the device prior to putting it back into oper-
ation. The passing of the routine check must
be documented by attaching a mark of con-
formity to the device.
Explosion-protected components may only
be replaced by original, checked compo-
nents from the manufacturer.
Devices that have already been used out-
side of hazardous areas and are intended
for use in hazardous areas in future must
comply with the safety demands placed on
repaired devices. Prior to operation, they
must be tested according to the specifica-
tions stipulated for "Repairing explosion-
protected devices".
Maintenance
35
EB 8383-1 EN
Advertisement
Table of Contents
