EVCO S.p.A.
EV3 MVC & EVD MVC | Application manual ver. 1.0 | Code 144EV3MVI104
page 42 of 72
PWM
A signal with constant frequency and variable duty cycle is generated at the output.
The frequency of the output configured as PWM is determined by the I73 and I76 parameters.
The duty cycle varies according to the value set: 0% output always off, 100% output always on.
Frequency
A signal with variable frequency and fixed duty cycle is generated at the output.
The output frequency varies according to the value set: below 10 Hz the output is always off. Maximum frequency value is 255 Hz. The
duty cycle is always 50%.
It is not possible to configure one output at 0-10 V and the other as PWM or frequency. The table below outlines permitted (O) and
prohibited configurations (X).
I71/I72
I74/I75
0 1 2 3 4
0 O O O O O
1 O O O O O
2 O O O X X
3 O O X O X
4 O O X X X
Parameters I63, I64, I65 and I66 determine the function of the analogue outputs.
AO configuration
I63 - I64 - I65 - I66 parameter
values
Description
0 Disabled
1 Water valve
2 Heater
3 Supply fan
4 Return fan
5 Mixing chamber damper
8.3 Triac and open collector outputs
Model EV3 MVC has 2 triac outputs (with an optional board), while model EVD MVC has an open collector output, which can be
configured by parameters I67 and I68 (controller) and I69 (expansion).
If the triac/OC output has been disabled it is possible to use it as a digital output (DO) using parameters I51/I52 and I61 to configure
the function.
Triac/OC outputs have % as the unit of measurement.
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