Tighten the socket set screw (4.16)
with a suitable level of torque.
Check whether the electrical signals
from the end-position limit switches
are present and correct. If necessary
repeat the above setting steps until
the signals are correct.
Make sure that all leads are con-
nected according to the wiring dia-
gram, and check the connections for
possible short circuits.
Re-install the unit or unit with valve
in the plant.
The torque to tighten the screw or
screws depends on their size.
See the table on page 20 for the
correct tightening torques.
Changing the timing belt
For work on the unit you need the fol-
lowing tools:
Torque wrench to DIN EN ISO 6789
Hexagon keys to
EN ISO 4762 / ISO 272
Open-ended spanners to
EN ISO 4762 / ISO 272
To change the timing belt, carry out
the work steps as described in the
section “Changing the limit switch
plate” and remove the limit switch
plate.
Place a screwdriver as shown in the
illustration:
Press the screwdriver in the direc-
tion of the arrow to release the ten-
sion in the timing belt.
When the tension is released, re-
move the timing belt and replace it
with a new one.
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