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5.4 Digital input configuration
The digital input function is defined using the iFi parameter and the action is delayed for the time programmed with parameter iti. The iFi parameter can be configured for the following functions:
0. Digital input not active;
1. Cell door opening with NO contact: at input closure (and after the iti) the instrument displays alternately oP and the variable set at idS parameter With this mode of operation of the digital input activates also the time set with parameter AoA elapsed which the alarm is activated to warn that the door has been left open. In addition, at door opening, the instrument returns to normal operation if it was in Eco mode and the Eco mode activation was enabled through parameter iEt
2. Similar to iFi = 1;
3. Cell door opening with output lock and NO contact: similar to iFi = 1 but with output lock. At alarm door open intervention AoA also the output is re-activated.
4. External alarm signal with NO contact: at input closing
(and after the iti time) the alarm is activated and the instrument alternately shows on the display: AL and the variable set with parameter idS;
5. External alarm signal with Control output disabled and
NO contact: at input closing (and after the iti time) the control output is is disabled, the alarm is activated and the instrument shows on the display alternatively AL and the variable set with parameter ids;
6. Normal/Economic mode selection with NO contact: at input closing (and after the iti time) the instrument switches to Economic operation mode. Opening the digital input, the instrument returns in Normal operation mode.
7. Instrument On/Off (stand-by) selection with NO contact: at input closing (and after the iti time) the instrument is switched ON while it is placed in Stand-by mode when the digital input is open;
8. Do not use;
-1, -2, -3, etc. - Features identical to the above but obtained through a NC contact and a reversed logic operation.
5.5 Temperature control
The instrument control is ON/OFF and acts on the output depending on the PR1 probe measuring, the Set Point SP (or
SPE), the Histeresys rd (or rEd) and the function mode rHC.
Temp.
Pr1
rHC = C
Temp.
Pr1
SP rHC = H rd rd
SP
time time
OUT (ot) OUT (ot)
ON off ON off ON ON off ON off ON
Depending on the function mode programmed with parameter rHC the differential is automatically considered by the controller with positive values for a Refrigeration control (rHC = C) or negative values for a Heating control (rHC = H).
In the event of a probe error, it is possible to set the instrument so that that the output continues to work in cycles according to the times programmed with parameter rt1
(activation time) and rt2 (deactivation time).
If an error occurs on the probe the instrument activates the output for the time rt1, then deactivates it for the time rt2 and so on whilst the error remains.
Programming rt1 = oF the output in probe error condition remains switched off.
Programming instead rt1 to any value and rt2 = oF the output in probe error condition remains switched ON.
Remember that the temperature regulation function can be conditioned by the Compressor Protections, Delay at power
ON and Defrost functions.
5.6 Compressor protection function and power-on delay
The “ Compressor Protection” function aims to avoid repeated compressor start-ups controlled by the instrument in cooling applications or otherwise can be used to add a timed control on the actuator control output
This function foresees 3 time controls on the switching ON of the output associated with the temperature control request The protection consists of preventing the output being switched ON during the times set with parameters PP1, pP2 and PP3 and therefore that any activation occurs only after all times are elapsed.
1. First control (parameter PP1) foresees a delay to output activation (switching-ON delay).
Temp.
Pr1
PP1 rd
SP
OUT (ot) off
PP1
OUT (ot)
PP1
ON off
PP1 off
time
2. Second control (parameter PP2) foresees an inhibition to the activation of the output by a time delay that starts when the output is turning OFF (delay after switching-OFF).
Temp.
Pr1
PP2 rd
SP
OUT (ot)
ON
ON
3. Third control (parameter PP3) foresees an inhibition to the activation of the output by a time delay that starts when the output was turned ON last time (delay between two switching-ON).
Temp.
Pr1
PP3 rd
SP
ON
PP3 off off
PP2 off
ON
ON off
PP2
PP3 off
ON
ON
ON
PP3 off
PP2
time
off
time
During the output inhibition the LED
OUT (Cool or Heat ) blinks. It is also possible to prevent activation of the output after the instrument is turned ON, for the time set in the parameter Pod.
During the power ON delay phase, the display shows the indication od, alternated with the normal visualization.
All these functions are disabled if the relative parameters are set to OFF (oF).
Ascon Tecnologic - e30 - OPERATING INSTRUCTIONS - PAG. 6
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