On/Off Service; Additional Notes Concerning Operation - Samson 3730 Series Mounting And Operating Instructions

7.2 On/off service

In on/off service, the supply pressure must
be limited depending on the bench range or
operating range of the actuator. The applica-
ble bench range or operating range which
the actuator can move through is written on
the nameplate (see the 'Markings on the de-
vice' chapter).
Actuator stem retracts
With fail-safe action "actuator stem retracts",
the permissible supply pressure must not ex-
ceed the upper bench range value by more
than 3 bar:
Bench range
0.2 to 1.0 bar
0.4 to 2.0 bar
0.6 to 3.0 bar
Actuator stem extends
With "actuator stem extends" fail-safe ac-
tion, the supply pressure must not exceed the
upper signal range value by more than
1.5 bar.
7.3 Additional notes con-
cerning operation
Î Label actuators with reduced supply
pressure with a sticker ("Max. supply
pressure limited to ... bar").
Î Only apply the signal pressure to the sig-
nal pressure connection (S) on the dia-
phragm chamber of the actuator which
7-2
Max.
Fail-safe
supply
action
pressure
4 bar
Actuator stem
5 bar
retracts
6 bar
does not contain any springs (see
Fig. 3-1 and Fig. 3-2 in the 'Design and
principle of operation' chapter).
Î Only use vent plugs that let air through
them.
EB 8313-3 EN