EVCO c-pro nano CHIL - Manual (Page 128)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Pag. 128
6.17.6 Power limiting
The power of the refrigerating circuit can be limited according to the status of a digital input, in
order to enable preventive management of pressure alarms. The digital input logic can be set by
acting on parameter Power-limiting logic PH63. According to the number of configured
compressors, the power-limiting percentage is calculated on the basis of two parameters:
- PC31 = Power limiting for summer operation
- PC32 = Power limiting for winter operation
The two parameters are expressed as a percentage value and follow this logic:
- With PC31 or PC32 = 0%, power limiting is at maximum level: all steps requested by
the regulator are stopped;
- With PC31 or PC32 = 100%, there is no power limiting: all steps requested by the
regulator are supplied.
In order to set this function, it is necessary to enable the parameter Power-limiting enable PC30
and to set the position where the associated digital input is to be connected. If such a value is not
set, the function will remain disabled.
6.17.7 High-pressure partialisation at high temperatures (chiller)
This control makes it possible for the refrigerating circuit to operate even in the presence of high
values of external air temperature, by contrasting the triggering of the high-pressure alarm via the
partialisation of the circuit’s active power.
- PC45 =Pressure partialisation enable at high temperatures
- PC46 = Pressure partialisation set point at high temperatures
- PC47 = Pressure-partialisation differential at high temperatures
- PC48 = High external air temperature threshold
- PC49 = Min. time for maintaining partialisation
According to the number of configured compressors, the power-limiting percentage is calculated on
the basis of this parameter:
- PC31 = Power limiting for summer operation
In order to enable this control, the external temperature probe (PH24) must also be enabled.