12
EB 5757 EN
Design and principle of operation
a fault alarm output or an output to report
when hot water is tapped.
1
8
2
4
3
6
7
5
1.1
1 Electric actuator
with process
controller
1.1Connecting cable
2 Handwheel
3 Actuator stem
4 Coupling nut
5
Travel indicator
6
Plug stem
7
Valve spring
8
Cover, serial RJ-12
jack
Fig. 2:
Functional diagram
The set point of the digital controller is set to
60 °C and can be changed in TROVIS-VIEW
using a connecting cable connected to the
RS-232 interface (serial interface) on the ac-
tuator or using a memory pen. The con-
trolled variable, control behavior, and the
actuator's direction of action can also be
changed in TROVIS-VIEW.
The output signal of the controller functions
as a three-step signal on the motor of the ac-
tuator and is transferred over the connected
gear to the actuator stem (3) and used as the
stroke. The motor is switched off by
torque-dependent switches when an end po-
sition is reached or in case the motor is over-
loaded.
The actuator is mounted onto the valve using
a coupling nut (4). When the actuator stem
extends, the globe valve is closed, opposing
the force of the valve spring (7). When the
actuator stem retracts, the valve is opened as
the plug stem (6) follows the motion of the
return spring.
When connected to a three-way mixing
valve, the extending actuator stem causes the
valve (
A
→
AB
) to open.
3.1 Operating controls
3.1.1 LEDs
The actuator has a red and a yellow LED
which indicate the operating state of the ac-
tuator. The LEDs are located underneath the
transparent cover on top of the actuator.
Blinking pattern of the yellow LED
−
Device off, no communication with
memory pen or command pen inserted
On
Off
Time [s]
−
Device switched on or memory pen in-
serted: memory pen action completed
On
Off
Time [s]
