Samson TROVIS 5431, Mounting And Operating Instructions

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temperature connected to AI is used, not the
temperature at the outdoor sensor. The value
range from 0 to 10 V corresponds to an out-
door temperature range from
−
40 to 50 °C.
CO1 F08 can only be activated when
CO-SYS F10-0 and F11-0 are deactivated.
For the processing of an external set point,
refer to chapter5.4.4.
5.2 Outputs
5.2.1 Outputs to the control valve (CO-SYS F05, F15)
The heating controller can control the valve
either by means of a three-step signal or an
on-off signal. For systems 1 to 4, access the
CO-SYS level, function block F05, to deter-
mine the appropriate signal output. In system
5, two control valves are being controlled,
with function block F05 being used to deter-
mine the output or the heating circuit and
F15 to determine the output for the drinking
water circuit.
Activate function blocks CO-SYS F05 and
F15 to generate a three-step signal. After
activation of the function blocks, you are
required to determine the following function
block parameters: gain K
p
, reset time T
N
and
the control valve’s transit time T
Y
. For system
5 in function block F15 additionally the deriv-
ative-action time T
V
as well as the gain of the
derivative-action component KpTv must be
determined
If you want to generate an on-off signal,
deactivate CO-SYS F05 and F15. For this out-
put, you are required to additionally deter-
mine the following function block parame-
ters: differential gap, minimum on-time and
minimum off-time.
Connect control valves with on-off input to
terminal 23 (system 1 to 4 and system 5
drinking water circuit) or to terminal 20
(system 5 heating circuit).
5.2.2 Limiting the system deviation for OPEN signal (CO-SYS F06, F16)
For three-step control, you can limit the
system deviation of the OPEN signal by acti-
vating the function block CO-SYS F06 for the
systems 1 to 5, and F16 for system 5 for the
drinking water circuit. With the function
block parameter ‘maximum system deviation’
(default 2 °C), the controller’s reaction to set
point changes which cause the control valve
to open, is limited. Especially for steam pres-
sure control and to simplify the start-up of
such systems, it is recommended to activate
this function.
5.2.3 Transmitting the outdoor temperature (CO-SYS F12)
Via analog output AO (0 to 10 V), the outdoor
temperature can be transmitted to another con-
troller, regardless of whether it is measured with
a sensor or received via analog input AI (0 to
10 V). Activate CO-SYS F12-1, to enable this
function. This is only possible if CO-SYS F10-0, i.
e. request for an externally required signal off,
and, if C01 F07-1, i. e. outdoor temperature on.
EB 5431 EN
37
Functional descriptions