Samson 5827, Mounting And Operating Instructions, Page: 16 / 92

3-2 EB 5827-2 EN
Design and principle of operation
3.2 Communication
Serial interface
The actuator is fitted with an RS-232 serial
interface. This allows communication with
TROVIS-VIEW using SSP protocol (see
Fig. 3-2 ).
The serial interface is exclusively intended for
servicing purposes. It must only be used
temporarily and not permanently.
Risk of damage to the electric actuator due
to overvoltage.
The serial interface of the electric actuator is
not fitted with a surge protector.
Î
Ensure that surge protection is provided
on connecting a cable.
Note
NOTICE
!
3.1 Fail-safe action
The actuator version with fail-safe action
contains a spring assembly (8, see
Fig. 3-1
on page 3-1) and an electromagnet. The
actuator is moved by the force of the spring
to the fail-safe position when the electromag-
net (terminals L and N) is de-energized. The
direction of action depends on the actuator
version and cannot be reversed.
The actuator is available with the following
fail-safe actions:
Actuator stem extends: upon supply voltage
failure, the actuator stem extends.
Actuator stem retracts: upon supply voltage
failure, the actuator stem retracts.
Increased wear and shortened service life
of the actuator.
Î
Do not use the fail-safe action to control
the valve position.
The actuator version with fail-safe action
does not have a handwheel (2) on the front
housing cover. Manual override is possible,
after removing the front cover, using a 4 mm
Allen key. The actuator returns to its original
position as soon as the Allen key is released.
Testing according to DIN EN 14597
The Type 5827 Electric Actuator with fail-
safe action "actuator stem extends" is tested
by the German technical surveillance associ -
ation TÜV according to DIN EN 14597 in
combination with different SAMSON valves
(the register number is available on request).
NOTICE !