Samson TROVIS 5757-3 Mounting And Operating Instructions page 14

Design and principle of operation
2
1 Electric actuator
with process
controller
1.1 Connecting cable
2 Manual adjuster
3 Actuator stem
Fig. 3-2: Design of TROVIS 5757-3
Manual adjuster
The travel can be adjusted using the manual
adjuster when the actuator is in the de-ener-
gized state (see the 'Operation' section).
Inputs
The electric actuator with process controller
has an input for a fast-response Pt 1000
temperature sensor. It can function as a fixed
3-2
8 1
3 5
4
7
6
4 Coupling nut
5 Travel indicator
6 Plug stem
7 Valve spring
8 Cover, serial RJ12
jack
set point controller with this input. Alterna-
tively, the electric actuator can be used for
domestic hot water in instantaneous heating
system. In this case, either a water flow sen-
sor or a flow switch must be used for fast de-
1.1
tection. The flow switch recognizes when the
hot water is being tapped. The water flow
sensor can additionally 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 0/4 to 20 mA current in-
put. This can be used either instead of the
temperature sensor (measured value) or to
connect an external set point.
The binary input can be used to change be-
tween the set points W1 and W2.
Output
The switching output can be configured as
either a pump output (circulation pump for
the DHW circuit or heating circuit), a fault
alarm output or an output to report when hot
water is tapped.
Setting
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
actuator or using a memory pen (see
section 3.1). The controlled variable, control
behavior and the actuator's direction of
action can also be changed in TROVIS-
VIEW.
All the functions and parameters are listed in
the Annex.
EB 5757 EN