EVCO EPK4BHQ1AH Installer manual - Manual (Page 94)

EVCO S.p.A. c-pro 3 NODE kilo AHU | Application manual ver. 1.0
page 94 of 114
6.20.3 Variation set point from supervisor
The program provides the possibility to manage a parameter OS02 Offset Set point from Supervisor which, based on the
status set by the supervisor, sums an offset at the control Set point. To enable this function set the parameter PH26 Enable
variation Set point from supervisor and set to one the related variable from supervisor.
Note: the offset is summed at the current value of the Set point and not that which is defined by the parameter; this
indicates that the Set point could have already been modified due to other interventions: time zone, variations by Digital
inputs.
6.20.4 Manual fan operation
In this status the devices do not participate in thermo control; they are however sensitive to eventual alarms. Manual
operation (or operating less than the two flow and return fans) is guaranteed by parameter PM20.
⋅ If value set to 0 (Auto) this will define normal device behaviour
⋅ If value set to 1 (Manu) this will disable the fans and bring them to manual operation
Fans operating manually do not participate in controls and can be forced into operation using parameter PM21.
If the fans are the On/Off type they may be forced on by simply setting any value greater than 0.0% at parameter
PM21. If the fans are in modulating control, and therefore at inverter with parameter PM21, it is possible to set the
speed which must be maintained during the test phase. In each case where the value is 0.0% the fans will remain off.
While operating manually the fans will always be sensitive to alarms and related consequences. In order to restore at
the control you will need to reset parameter PM20 to the value “Auto” (Automatic).
6.21 Time schedule
The real time clock allows the operator to define a weekly schedule for the unit.
Three different time bands (T1/T2/T3) can be defined. Each time band have a set point offset to adjust the actual
control set point.
Each day of the week can have 3 time bands, every band has an hour of start, and this band continue till next valid
band of the same day, or other days.
If the RTC is in alarm or disabled, the function becomes inhibited.
6.22 Miscellaneous management
6.22.1 Last date of maintenance
In the Menu Maintenance Operator->Operation you will find a page with the ability to memorize the last date of
maintenance for the plant. By pressing on “Update” the old date which is in the system will automatically be updated
with the new correct date; updating the maintenance date can be done at parameter PM90.
6.22.2 Restore default parameters
Using the “Parameter resetting” procedure, all system parameters can be reset to their original default values. After
entering the InSt->MAP menu – which is only accessible while the machine is switched OFF – set parameter PH15=1
and wait for the “0” value to reappear on the display; the system will automatically reset all parameters back to their
default values.
After this operation, it is necessary to power down the machine and then power it up again, to avoid the risk of
malfunctions.