Design And Principle Of Operation - Samson TROVIS 5757-3 Mounting And Operating Instructions

3 Design and principle of oper-
ation
The TROVIS 5757-3 Electric Actuator with
Process Controller is an electric actuator with
an integrated digital controller. It can be
mounted onto SAMSON Type 3213,
Type 3222, Type 3222 N, Type 2488, and
Type 3267 Valves (DN 15 to 25) and onto
special versions of Type 3260 and
Type 3226 Valves.
The electric actuator with process controller
has an input for a Pt 1000 temperature sen-
sor. It can function as a fixed set point con-
troller with this input. Alternatively, the elec-
tric actuator can be used for domestic hot
VL Flow pipe
RL Return flow pipe
WW Hot water
KW Cold water
VS Flow sensor
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WSS Water flow sensor
Fig. 1: Sample application: domestic hot water heating with Pt 1000 sensor and water flow sensor
EB 5757 EN
2
1 Heat exchanger
3
2 Temperature sensor including sensor pocket, VS
1
3 Supply from district heating network (VL)
4 TROVIS 5757-3 Electric Actuator with Process Controller
5 Water flow sensor with extension cable
6 Return flow to district heating network (RL)
4
7 Valve, e.g. Type 3222
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6

Design and principle of operation

water in instantaneous heating system. In
this case, either a water flow sensor or a
flow switch must be used. The flow switch
recognizes when the hot water is being
tapped. The water flow sensor can addition-
ally record the quantity of hot water being
tapped. An optimization function adapts the
control to the changing network conditions.
In addition to the temperature sensor input,
the actuator has a current input. This can be
used either instead of the temperature sensor
or to connect an external set point. For ver-
sions with a switching output (firmware ver-
sion 2.0x/2.1x), this output can be config-
ured as either a pump output (circulation
pump for the DHW circuit or heating circuit),
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