Samson 3374 Mounting And Operating Instructions - Equipment
Setting with limited travel range
Travel calibration is usually based on the
maximum travel of the control valve.
If, however, the maximum possible travel is
to be limited to a smaller travel end value,
press the button (4) once at the start of cali-
bration while the signal lamp blinks for
10 seconds.
As a result, travel calibration via the poten-
tiometer gear with rated travel 15 or 30 is
limited to 6 mm.
Each pressing of the button further increases
the travel range by 1 mm.
If, for example, a control valve designed for
15 mm is to be operated with a limited
travel range of 10 mm, press the button (4)
5 times during the 10 second time limit.
The top signal lamp (8) flashes each time
the key is pressed.
Reporting defined events
At the binary output (terminal 83 and 84),
predefined events can be indicated (see
EB 8331-2 EN) during positioner operation
and transmitted to a control room.
5 Retrofitting additional electrical
equipment
The actuator can be subsequently equipped
with two limit switches, two potentiometers
or a digital positioner.
Depending on the actuator version used,
the actuator board needs to be replaced as
well.
The actuator version is marked on the name-
plate, e.g. Model 3374-11000002000.
When ordering additional electrical equip-
ment from the manufacturer make sure to in-
clude this model number in the order.
Caution!
When installing electrical acces-
sories, make sure the supply voltage
and the signal input are discon-
nected.
Only use power interruption devices
which are protected against uninten-
tional reconnection of the power sup-
ply.
Note!
It is recommendable to slightly apply
lubricant (e.g. Vaseline) to the
spindles on the gear faces and to
the sides of the cogs.
EB 8331-1 EN
15
Retrofitting additional electrical equipment