20
EB 8340 EN
Manual operation of actuator
6.2 Version with mechanical
override
1. Press the black release button at the front
of the housing.
2. Insert a hexagon wrench (width across
flats 24) into the shaft end protruding
from the housing to move the rack-and-
pinion gear until the require actuator
stem position has been reached.
As soon as the button is released, the actua-
tor reacts again to the controller signal.
If the valve is to remain in the manually de-
fined position, disconnect the isolating termi
-
nal 81 as described in section 6.1.
100%
0%
4
20 mA
12
4
20 mA
100%
0%
< >
>>
< >
>>
Actuator stem
retracted
Actuator stem
extended
Split-range operation
Input signal
Travel
Dead band
Fig. 8:
Characteristics
Summary of Contents for 3274
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