Form-Fit Actuators; Force-Locking Actuators - Samson 5824 Mounting And Operating Instructions

Start-up

5.2.1 Form-fit actuators

With form-fit actuators, the clamped connec-
tion between the actuator stem and the
valve eliminates the possibility of lost motion.
To start the initialization, press the initializa-
tion button for 3 seconds.
The green operation LED indicates the cur-
rent status as follows:
LED off Actuator stem extends,
final position = 0 %
LED on Actuator stem retracts,
final position = 100 %
LED blinks Standard operation
When initialization is activated, the operation
LED goes out and the actuator moves the actu-
ator stem to the final position (0 %).
When the final position is reached, the oper-
ation LED lights up, the operating direction is
reversed and the actuator moves the actuator
stem to the final position (100 %).
Shortly after completion of the initialization
routine, the actuator is reset to standard
operation, and the operation LED blinks.
CAUTION!
Changes in the position of the white poten-
tiometer gear lead to an incorrect position
feedback and thus to a faulty initialization.
If you have changed the position of the
gear, proceed as follows for correction:
Extend the actuator stem fully (zero posi-
tion). Using a screwdriver, turn the poten-
tiometer shaft counterclockwise until it does
not go any further, then turn back clockwise
by approx. 10°.
Following this, a new initialization routine is
required to determine the final positions.
12
EB 5824-1 EN

5.2.2 Force-locking actuators

In case of a force-locking connection be-
tween actuator and valve via a coupling
nut, the actuator stem is not firmly con-
nected to the plug stem, but only contacts it.
If the travel range of the actuator is wider
than the valve travel, the actuator stem is
lifted off the valve stem during the initializa-
tion. As a result, the final positions are not
determined correctly. Therefore, it is impera-
tive that the actuator be moved manually to
the valve’s final positions of 0 % and 100 %
travel.
The initialization procedure is explained in
chapter 6.1. For LNS-based configuration
tools, the actuator can also be initialized
conveniently by means of software using a
plug-in such as Plug-in Version 1.5 as
described in TV-SK 6328.