EVCO S.p.A.
EV3 MVC & EVD MVC | Application manual ver. 2.2c | Code 1443DMVCI224
page 46 of 74
8.3.1.3 0-10 V
The output voltage varies according to the value set: 0% output always off, 100% output at 10 V.
8.3.1.4 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 I40 parameter.
The duty cycle varies according to the value set: 0% output always off, 100% output always on.
8.3.1.5 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%.
8.3.2 Exclusions
It is not permitted for one analogue output to be configured as 0-10 V and the other as PWM or as a frequency. The table below
outlines the permitted (O) and prohibited (X) configurations.
I38\I39 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
8.3.3 Configuring AO function
Parameters I34 and I35 determine the function of the analogue outputs in accordance with the following table:
Parameter value
I34 - I35
Description
0 Disabled
1 Water valve
2 Heater
3 Supply fan
4 Return fan
5 Mixing chamber damper
8.4 Configuring triac and open collector outputs
Model EV3 MVC has 2 triac outputs (with an optional board), while model EVD MVC has one (1) open collector output, which can be
configured with parameters I36 and I37.
If it is decided to disable the triac/OC outputs they can be used as DO digital outputs.
Triac/OC outputs have % as the unit of measurement.
TK/OC configuration
Parameter value
I36 - I37
Description
0 Disabled (or DO)
1 Heaters
In model EVD the TK1 triac output has been replaced with an open collector output.
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