EVCO c-pro mega RACK - Manual (Page 92)

C-PRO MEGA RACK & C-PRO GIGA RACK APPLICATION MANUAL
Page 92
2) LIFO
This follows “Last In First Out” logic, i.e. the last fan switched on will be the first to be switched
off.
Example.
Switch on : F1 . F2 . F3 . F4 … . F12
Switch off : F12 . … F4 . F3 . F2 . F1
3) FIFO + time of operation
This type of rotation functions by considering the number of operating hours for each fan. Startup
will switch on the fan with the least operating hours, while shut down will switch off the fan with
the most operating hours.
In the case where a selection must be made between fans with the same number of hours, then a
FIFO rotation is implemented, so as to thus guarantee rotation of the configured fans. The same
rules described previously are also valid for FIFO rotation.
Example 1
Switch on : F1(3 hours) . F2(3 hours) . F3(3 hours) . F4(3 hours)
Switch off : F1(3 hours) . F2(3 hours) . F3(3 hours) . F4(3 hours)
Example 2
Switch on : F1(1 hour) . F2(3 hours) . F3(3 hours) . F4(5 hours)
Switch off : F4(5 hours) . F2(3 hours) . F3(3 hours) . F1(1 hour)
Time based rotation seeks to balance the number of operating hours of the fans present in the
system.
4) LIFO + time of operation
This rotation favours comparing the operating times of the various fans. During startup, the fan with
the least operating hours will be favoured, while shut down will favour the fan with the most
operating hours.
In the case where a selection must be made between fans with the same number of hours, then a
LIFO rotation is implemented, so as to thus guarantee rotation of the configured fans. The same
rules described previously are also valid for LIFO rotation.
Example 1
Switch on : F1(3 hours) . F2(3 hours) . F3(3 hours) . F4(3 hours)
Switch off : F4(3 hours) . F3(3 hours) . F2(3 hours) . F1(3 hours)
Example 2
Switch on : F1(1 hour) . F2(3 hours) . F3(3 hours) . F4(5 hours)
Switch off : F4(5 hours) . F3(3 hours) . F2(3 hours) . F1(1 hour)
Time based rotation seeks to balance the number of operating hours of the fans present in the
system.
6.6.4 Protective device timings
All the timings pertaining to compressor management are listed below