Control Modes; Linear Mode; Linear Mode Linked Only With Digital Outputs-Compressors On/Off+Unloaders - Full Gauge Controls RCK-862 plus Manual

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
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
Digital hysteresis
Step =
Number of outputs
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
31
30
29
28
27
26
25
22
cc 1.Function settings -c 1.2 Suction.
Actuation output pressure value for output ''N''
Actuation = Setpoint + (N x Step)
Shutdown output pressure value of output ''N''
Actuation = Setpoint + (N - 1 x Step)
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
The RCK-862 plus defines the
Outputs
C1 + C2 + C3 + C4 + C5 + C6
C1 + C2 + C3 + C4 + C5
C1 + C2 + C3 + C4
C1 + C2 + C3
C1 + C2
C1
OFF