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Design and principle of operation
ator stem extends, it presses on the plug stem
(10) of the valve.
When the actuator stem retracts (force-lock-
ing attachment), the plug stem follows the
movement of the actuator stem as a result of
the return spring in the valve.
When the actuator stem retracts (form-fit at-
tachment), the plug stem is connected to the
actuator stem and follows its movement.
Manual override
Î See the 'Operation' section.
The actuator version without fail-safe action
(TROVIS 5724-3) has a handwheel used to
manually position the valve (only when the
actuator is disconnected from the power sup-
ply). Travel and direction of action can be
read off the travel indication scale.
Inputs
The integrated digital controller must be con-
nected to a temperature sensor on the input
side, which can be optionally upgraded by a
water flow sensor or a flow switch.
Alternatively, a current signal can be used
for mechanical engineering applications.
A binary input is used to switch between two
internal set points or, alternatively, can be
used to deactivate the function to maintain
the heat exchanger at a constant tempera-
ture.
Outputs
A circulation pump can be controlled with
the 230 V switching output (see Technical
data in section 3.3).
3-2
Alternatively, the switching output can be
used as fault alarm output or can be config-
ured to register the tapping of hot water. The
actuator is configured with the TROVIS-VIEW
software.
Setting
The set point of the digital controller is set to
60 °C and a second set point is set to 70 °C.
They can be changed in TROVIS-VIEW using
a connecting cable connected to the RS-232
interface (serial interface) on the actuator or
using a memory pen.
The set point can also be adjusted at the set
point potentiometer on the device (see the
'Operation' section).
The controlled variable, control behavior and
other parameters can be changed in this
way.
All the functions and parameters are listed in
the Annex.
3.1 Fail-safe action
The TROVIS 5725-3 Electric Actuator with
Process Controller contains a spring mecha-
nism and an electromagnet. The actuator
stem is moved by the force of the spring to
the fail-safe position when the electromagnet
(connected to terminals L and N) is de-ener-
gized.
Note
The actuator stem of TROVIS 5724-3 re-
mains in its last position in the event of sup-
ply voltage failure.
EB 5724 EN
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