iSMA-B-FCU /FCU Hardware
Version 1.1
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4
ISMA-B-FCU device outputs
ISMA-B-FCU device is equipped with three types of outputs: 2 Triac Outputs,
5 Digital Outputs, and 4 Analog Outputs.
4.1 Triac Outputs
ISMA-B-FCU device is equipped with two Triac Outputs designed for heating and cooling thermal
valve actuators. Depending on controller model, Triac Outputs can be connected to actuators
with 230 V AC supply (for iSMA-B-FCU-HH) or to actuators with 24 V AC supply (for iSMA-B-FCU-
HL and iSMA-B-FCU-LL). In iSMA-B-FCU-HL, Triac Outputs are supplied with 24 V AC from a build-
in transformer, whereas in iSMA-B-FCU-LL and iSMA-B-FCU-HH Triac Outputs are connected
directly to Power Supply terminals.
Triac Outputs can work as typical binary outputs (for Binary Temperature Control) or with PWM
modulation. PWM mode has two parameters:
•
Duration time in seconds (this value depends on valve parameters)
•
Fill out (percentage value of signal fill out).
The figure below presents the way actuators are connected to Triac Outputs (for
4 pipes mode).
Figure 17 Connection between Thermal Valves and Triac Outputs: a) iSMA-B-FCU-HH; b) iSMA-B-FCU-HL, and iSMA-B-FCU-LL
WARNING!
In case of iSMA-B-FCU-HH or iSMA-B-FCU-LL controller, the actuators connected to each Triac
Output may consume up to 0.5 A under constant load. In some cases the current can be higher
for a limited time, 1.5 A up to 30 seconds.
In case of iSMA-B-FCU-HL controller, the sum of power consumption of both Triac Outputs and
24 V AC output cannot exceed 0.3 A (7 VA):
I
max
= 0,3
A = I
TO1
+ I
TO2
+ I
24VOut
.
