14.SUCTION CONTROLS
14.4 Control Modes:
Each suction pressure switch can be programmed, in parameter 1.2.x.1 , to operate according to one of the Control Modes: Linear Mode, Rotation
Mode, Dead Zone Mode, Dead Zone Mode with rotation and Progressive Algorithm Mode.
14.4.1 Linear Mode:
Linear mode is applied when using compressors of the same capacity, combined or not with a compressor with proportional modulation (inverter).
Compressors and their unloader valves are activated (if configured) sequentially and at equal pressure intervals. It follows the ascending order
according to its nomenclature and shutdown.
14.4.1.1 Linear mode connected only with digital outputs - ON / OFF compressors + Unloaders
The Linear control mode, when it has only digital outputs connected, commands the actuation and shutdown of each compressor sequentially and with
pressure intervals of the same magnitude (step). The RCK-862 plus uses a setpoint value and pressure hysteresis to control the suction of the
compressors. If the compressors have unloaders valves (auxiliary outputs), the logic of actuation and shutdown can be chosen according to
parameters 1.2.x.34 and 1.2.x.35
The digital outputs are linked with the compressors in the Main Menu 1.Function settings 1.2 Suction.cc -c The RCK-862 plus defines the
actuation and shutdown points according to the hysteresis value and the number of compressors configured in the suction, according to the ‘’step’’
variable defined below:
Digital outputs actuation step
Step =
Digital hysteresis
Number of outputs
Actuation output pressure value for output ‘’N’’
Shutdown output pressure value of output ‘’N’’
Actuation = Setpoint + (N x Step)
Actuation = Setpoint + (N - 1 x Step)
Example: Linear control linked only with ON-OFF compressors
ON / OFF compressors only
When using on / off compressors (ON / OFF), each compressor is associated with only one output, so the Step is equal to hysteresis by dividing the
number of compressors
1.2.x.1 Control mode: Linear
1.2.x.2 Setpoint: 25 psi
1.2.x.4 On / Off Hysteresis: 6 psi
1.2.x.15 Number of compressors: 6
1.2.x.22 Compressor 1 modulation: ON / OFF
In this case, each compressor is associated with a digital output and the Step is defined as 6/6 = 1 psi
25
26
27
28
29
30
31
(psi)
C1
C1 + C2
C1 + C2 + C3
C1 + C2 + C3 + C4
C1 + C2 + C3 + C4 + C5
C1 + C2 + C3 + C4 + C5 + C6
OFF
Outputs
1.2.x.23 Compressor 2 modulation: ON / OFF
1.2.x.24 Compressor 3 modulation: ON / OFF
1.2.x.25 Compressor 4 modulation: ON / OFF
1.2.x.26 Compressor 5 modulation: ON / OFF
1.2.x.27 Compressor 6 modulation: ON / OFF
22
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