EVCO c-pro nano CHIL - Manual (Page 125)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Pag. 125
6.17 Miscellaneous Management
6.17.1 Set point variation
The program provides for the possibility of managing parameters Secondary summer set point offset
(chiller) SSC1 and Secondary winter set point offset (heat pump) SSH1, which, according to the
status of a digital input, sum an offset to the main set point, to allow the latter to be varied. The
digital input logic can be set by acting on parameter Secondary set DI logic PH62.
In order to set this function, it is necessary to enable the parameter Secondary set point enable from
digital input PH25 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.
The secondary offset can also be exploited from supervision, by enabling the parameter Secondary
set point enable from supervisor PH26 and setting to “1” the associated supervisory variable.
6.17.2 External probe configuration (AI04 / AI05)
According to the machine type in use, the external-temperature probe is positioned on the fourth or
fifth (with expansion) analogue input; by intervening on appropriate parameters, it is possible to
correctly configure the two transducers.
SINGLE CIRCUIT (PG01=1, PG02=0)
The external temperature probe is positioned on the fourth analogue input (AI04). In order to
configure this feature, the following parameters must be set:
⋅
PH24 = 1
⋅
PH44 = 2
Both parameters PH24 and PH44 must be set, as otherwise the external probe will not be correctly
configured and cannot function.
Note 1. If AI04 is to used as digital input DI06, correct configuration is as follows:
⋅
PH24 = 0 (Disables the external probe)
⋅
PH44 = 1
On single-circuit machines, in this configuration all functions connected with the external
temperature probe will be inhibited.
Note 2. If AI04 is to used as accumulation temperature (see para. 2.17.10), correct configuration is
as follows:
⋅
PH24 = 0 (Disables the external probe)
⋅
PH44 = 3
On single-circuit machines, in this configuration all functions connected with the external
temperature probe will be inhibited.
TWIN CIRCUITS with expansion (PG01=2, PG02=1)
The external probe is positioned on the 5
th
analogue input (AI05), thus output AI04 is available for
other purposes. In order to correctly configure the external temperature probe, the following
parameters must be set:
⋅
PH24 = 2 (Enables the external temperature probe on AI05)
⋅
PH44 must be set to a value other than 2.