EVCO c-pro mega RACK - Manual (Page 95)

C-PRO MEGA RACK & C-PRO GIGA RACK APPLICATION MANUAL
Page 95
is not possible. To correctly configure this feature, simply enable at least one compressor/fan
inverter, depending on the type enabled, the other type will be automatically excluded from the
analogue outputs.
The only case where it is possible to use both compressor inverters and fan inverters is when the
parameter unique condensation (PG30) is set; in this case, the last analogue output (AO04) may be
used as the sole fan inverter.
Note 1. If a compressor inverter is selected, it is not possible to use incremented compressors, and
vice versa.
Note 2. If a compressor inverter is selected, it is not possible to use compressors with different
nominal power ratings, and vice versa.
6.7.2 Compressor time bands
By means of the parameter enable compressor time bands (PT00) it is possible to enable the time
band function. The program provides up to four different bands with related offsets (different for
each circuit) to be summed up to the main suction setpoint.
Depending on the time band, on the basis of the current time, the program will automatically sum
the circuit offsets to the suction setpoint, outwith the selected bands, the setpoint will remain at the
value set by the parameter.
Time band configuration is based on 4 parameters (different for each circuit) for the setpoint offsets
and an additional four parameters (general) for the time band settings:
⋅
Time band 1 start - Circuit band 1 offset (1,2,3)
⋅
Time band 2 start - Circuit band 2 offset (1,2,3)
⋅
Time band 3 start - Circuit band 3 offset (1,2,3)
⋅
Time band 4 start - Circuit band 4 offset (1,2,3)
Hence, the time bands will be defined thus:
1. Time band 1 start ÷ Time band 2 start
2. Time band 2 start ÷ Time band 3 start
3. Time band 3 start ÷ Time band 4 start
4. Time band 4 start ÷ Time band 1 start
Where less than the four envisaged bands are set, in order to guarantee correct management
operation, it is essential to set the remaining band start parameters to the value of the last set band,
and obviously set the relevant offset to zero.
Example 1. Four time bands. Assuming a suction setpoint = 1.0 bar
Band start Offset Setpoint Description
02:00:00 +0.3 1.3 bar From 02:00:00 to 07:15:00
07:15:00 +0.1 1.1 bar From 07:15:00 to 15:13:00
15:30:00 -0.5 0.5 bar From 15:30:00 to 23:00:00
23:00:00 -0.2 0.8 bar From 23:00:00 to 02:00:00
Example 2. Two time bands. Assuming a suction setpoint = 1.0 bar