EVCO c-pro nano RACK - Manual (Page 54)

C-PRO NANO RACK E C-PRO MICRO RACK APPLICATION MANUAL
Page 54
Example. 1
Turn-on : C1(3 hours) . C2(3 hours) . C3(3 hours) . C4(3 hours)
Shutdown: C4(3 hours) . C3(3 hours) . C2(3 hours) . C1(3 hours)
Example. 2
Turn-on : C1(1 hour) . C2(3 hours) . C3(3 hours) . C4(5 hours)
Shutdown: C4(5 hours) . C3(3 hours) . C2(3 hours) . C1(1 hour)
6.4.2 Management of throttlings
The program is capable of managing up to 4 throttled compressors.
Throttling a compressor means distributing its total load over various steps, improving its function and
decreasing the number of breakaways so as to ensure that the machine lasts longer.
Number of throttlings
It is possible to choose, using the parameter PG04, one or two throttlings of equal power for each compressor.
Each compressor will have the same number of throttlings available.
The configurations possible for the number of throttlings per compressor are clearly limited by the number of
available digital outputs.
Throttling logic
If compressors subjected to throttling are being used, it is possible, through the use of the PC03 parameter, to
choose the logic of operation of the outputs dedicated to throttling:
- If set to zero, the outputs will be normally excited (closed) and will be opened to request more
power: NC logic Copeland.
- If set to one, the outputs will normally not be excited (open) and will be closed to request more
power: NO logic Feeders.
Turn-on/Shutdown Mode
In the case where compressors subjected to throttling are used, the PC02 parameter makes it possible to set the
turn-on/shutdown mode of the throttlings.
If set to zero:
Turn-on: CppCppCpp. The program favors the complete turn-on of the single compressor before
passing to the next one.
Shutdown: ppCppCppC. The program favors the compete shutdown of the single compressor before
passing to the next one.
If set to one:
Turn-on: CCCpppppp. The program favors first the turn-on of all compressors and only following this,
will it act on the throttlings.
Shutdown: ppppppCCC. The program favors first the shutdown of all the throttlings and only at the end
will it shut down all the compressors.
Note.
In this last case, the logic in turn-on and shutdown of the single throttlings follows this logic (example with 3
compressors):
Turn-on compressors : C1 . C2 . C3
Turn-on throttlings : p1C1 . p1C2 .p1C3 / p2C1 . p2C2 . p2C3
Shutdown throttlings : p2C3 . p2C2 . p2C1 / p1C3 . p1C2 . p1C1