EVCO S.p.A.
EV3 HRV & EVD HRV
| Application manual ver. 1.0a | Code 1443DHRVE104
page 45 of 74
110
Humidity probe
111
CO
2
probe
112
Remote control probe
113
Pressure differential probe
8.2.2
Universal input type configuration
Parameter value
I13/I14
Description
0
NTC / Digital input
1
4-20 mA
2
0-10 V
3
0-5 V
Important:
only for EV3 HRV, if either input IN1 or IN2 has been set to powered up (0-5 V or 0-10 V), the other must be also. If this
does not happen the reading of the input set to powered up will be affected by the offset.
The choice of the type of probe influences the unit of measurement used: probes measuring temperature return values in °C or °F
depending on the setting of parameter C59, while probes measuring power or voltage use the units Pa or % (%rh in EVJ LCD) in
accordance with the conversion scales set by parameters I15-I18 that determine the scale start and end values for sensors configured
as humidity, CO
2
, pressure or remote control probes.
8.3
Analogue Output Configuration
There are 2 analogue outputs, AO1 and AO2. Parameters I38 and I39 determine the output type: 0-10 V, phase cutting, PWM,
frequency or disabled.
8.3.1
Configuring type AO
Parameter value
I38 - I39
Description
0
Disabled (or DO)
1
Phase cutting
2
0-10 V
3
PWM
4
Frequency
The choice of the output type influences the unit of measurement: frequency outputs are measured in Hz whereas phase cutting, power
and PWM outputs are measured in %.
If the heaters are driven by a solid-state relay, low-frequency PWM and live voltage can also be regulated and can be configured
(between 0 and 10 V) by parameter.
The timing of the resulting square wave (from 0 to 255 seconds) can be configured by parameter C31, while the amplitude of the
output signal is configured by parameter C32. In order to use this regulation, the output must be configured as 0-10 V. If a heater is
driven by a modulating signal of 0-10 V, parameter C31 is to be set to 0.
8.3.1.1
Disabled (or DO)
If it is decided to disable the analogue output it can be used as a DO digital output.
8.3.1.2
Phase cutting (with AC power only)
A pulse of 500 µs is generated at the output, synchronised with the 0 of the device’s power supply voltage. The pulse delay relative to
the zero-crossing is calculated so that the value set is the value of the effective voltage on the load: below 20% the output is always
off, above 90% the output is always on.
A fixed start-up time of 1s is applied when the output shifts from 0% to a different value: for this time the output is forced at 100%.
The shift value is fixed at 2.5 ms.
