EVCO c-pro mega RACK - Manual (Page 83)

C-PRO MEGA RACK & C-PRO GIGA RACK APPLICATION MANUAL
Page 83
3) N°2 circuit (PG01=2), n°1 circuit 1 compressor, n°2 circuit 2 compressors (PG11=1,
PG15=3), only circuit 2 inverter enabled (PG12=0, PG16=1). A correct configuration is:
HC01 = 1 -> digital output for the circuit 1 first hermetic compressor
HC02 = 2 -> digital output per the circuit 2 inverter consent
HC03 = 3 -> digital output for the circuit 2 first hermetic compressor command
HC04 = 4 -> digital output for the circuit 2 second hermetic compressor command
HC31 = 1 -> analog output for the circuit 1 inverter command
HC32 = 2 -> analog output for the circuit 2 inverter command
4) N°2 circuits (PG01=2), n°1 circuit 1 compressor, n°3 circuit 2 compressors (PG11=1,
PG15=3), both inverter enabled (PG12=1, PG16=1). A correct configuration is:
HC01 = 1 -> digital output for the circuit 1 inverter consent
HC02 = 2 -> digital output for thr circuit 2 inverter condent
HC03 = 3 -> digital output for the circuit 2 first hermetic compressor command
HC04 = 4 -> digital output for the circuit 2 second hermetic compressor command
HC31 = 1 -> analog output for the circuit 1 inverter command
HC32 = 2 -> analog output for the circuit 2 inverter command
6.4.9 Compressors of different nominal power
Management of compressors with different nominal power might be useful in order to have more
precise regulation in order to establish the final value at the configured setpoint.
In order to use this type of management, it is essential to enable the relevant parameter, enable
compressors of different nominal power (PG03) and set the parameters representing the nominal
power for each of the compressors to be used in the system.
The software calculates the maximum power that can be expressed by the individual nominal power
ratings of each of the compressors, and, on the basis of the requests from the regulators, calculates
the best combination of compressors in order to provide the requested power. For finer regulation,
the resolution within each power step is tripled; this way, with compressors of different nominal
power, there are more combinations that can approach the effective power requested by the
regulators. With each variation in request, the permutation of compressors is recalculated so as to
produce a power output equal to or greater than the request.
In the calculation of the permutation, any compressors that are manually disabled, in alarm states or
in waiting times, are not considered.
Please note. By enabling this function it is not possible to use incremented compressors or
compressors with inverters.
Side band regulation
On the basis of the control parameters, the application will calculate the power necessary to restore
the measured pressure/temperature close to the desired setpoint.
The requested power will be calculated on the basis of a proportional or proportional + integral
regulator, while the power provided will be given by the combination of compressor power outputs
closest to exceeding the request.
Neutral zone regulation
On the basis of the zone in which the regulator is located, a new sequence of compressors to be
activated is calculated, in particular: