Version With Mechanical Override - Samson 3274 Mounting And Operating Instructions

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%
Actuator stem
retracted
Travel
Actuator stem
extended
0%
4
100%
Split-range operation
0%
Fig. 8: Characteristics
20
< > >>
20 mA
Input signal
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4 12 20 mA
Dead band
EB 8340 EN