EVCO c-pro nano CHIL - Manual (Page 108)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Pag. 108
6.7 Condensation Regulation
Condensation management provides for fan control of condensing pressure: this can be achieved
using an analogue output (inverter or phase-cut) for each circuit.
If parameter PF02 is set to 0, regulation will be independent of thermoregulation; otherwise, fans
will be activated only if the thermoregulator requests the switching ON of at least one compressor.
6.7.1 Fan linear regulation
Thanks to the continuous regulation of fans, a proportional linear control of condensation is
performed, via an inverter (output A02, 0-10 V type; or A03, 4-20 mA type), or via a phase-cut
module (pulsed output A01).
Fan speed regulation provides for a minimum speed value, to manage start-ups in such a way as to
avoid operating fan motors at an excessively low rpm rate. In addition, it is possible to set a Speed-
up time PF27 at start-up, during which the fan will reach maximum speed.
The possibility is provided for, of maintaining the fans at minimum speed, even below the set point
value. Should pressure decrease further below the set point of a given threshold, fan switching OFF
is forced.
There is, in addition, a high-speed value beyond which velocity remains constant. If maximum
forcing has been enabled, should pressure increases further, exceeding a given threshold, fan speed
will be forced to 100%.
The following figure illustrates the behaviour of continuous regulation in the case of summer
operation (chiller). In this particular regulation, the proportional band is completely shifted above
the set point.
- Mode = Operating mode (0 = Summer)
- PF11 = Summer condensation regulation set point (SP)
- PF12 = Summer condensation regulation differential
- PF13 = Summer maximum speed forcing enable
- PF14 = Summer maximum speed forcing set point (SPF)
Pressure
Speed
SP SP - X SP + diff
Low speed
High
speed
100%
SPF
SPF - Y