EVCO c-pro mega RACK - Manual (Page 91)

C-PRO MEGA RACK & C-PRO GIGA RACK APPLICATION MANUAL
Page 91
4. On: the fan is on. In this state, the user interface displays the message “ON”.
5. Awaiting switch on: the fan is about to be switched on, and is currently waiting protective
device waiting times. In this state, the user interface flashes the message “WON”.
6. Alarm: the fan is off and in the alarm state. In this state, the user interface displays the
message “ALL”.
7. Manual: the fan is in manual operational mode. In this state, the user interface displays the
message “MAN”.
In any case, a manually functioning fan is sensitive to any alarms, in this case, the status will be that
of Alarm.
6.6.3 Fan rotation
Fan rotation is a procedure that allows the number of operating hours and start-ups for each device
to be balanced as much as possible.
Rotation does not involve any fans that are in alarm or manual operation states, and is capable of
dynamically switching on others should one or more be switched to the alarm state.
In all the rotation types managed, any compressors restored from the alarm state or operating
manually, will be inserted at the top of the list of compressors to be switched on. They will have
maximum priority with respect to the other compressors, altering the switch on and switch off
sequence. Rotation type is set by means of the parameter Fan Rotation (PF01).
The program can manage 4 types of rotation: FIFO, LIFO, FIFO + time, LIFO + time.
1) FIFO
This follows “First In First Out” logic, i.e. the first fan switched on will be the first switched off.
Initially, this logic might leads to a large difference in operational hours between the various fans,
but after an initial phase, this should more or less balance out.
Example.
Switch on : F1 . F2 . F3 . F4 … . F12
Switch off : F1 . F2 . F3 . F4 … . F12
FIFO rotation has one peculiarity. If, for example, the first fan is switched on and then off, the next
fan to be switched on will be the second. The last fan switched off will be remembered so as to then
switch on the next in sequence, thus avoiding always using the same and so better exploiting all the
configured resources.
Example with 4 fans:
Switch on : F1 . Switch off : F1 .
Switch on : F2 . F3 . Switch off : F2 . F3 .
Switch on : F4 . F1 . F2 . F3 . Switch off : F4 . F1 . F2 . F3 .
This type of rotation seeks to balance the number of switch on and off operations for the fans
configured.