Full Gauge Controls RCK-862 plus Manual Download Page 25

Page: 25 / 70

14.SUCTION CONTROLS

14.4.2 Rotation Mode:

This mode operates in a similar way to the Linear Mode, however, making a time rotation to start and stop the compressor according to the recording of
the hours in operation of each compressor. When the control recognizes the need to start a compressor, the preference is to start the compressor with
the lowest number of hours of operation. Likewise, when it is necessary to shut down the compressor, the preference is to shut down the compressor
that has a greater number of full hours on. The number of operating hours for each compressor can be viewed in the Control Menu, in the Hour meters
option. In this same menu it is possible to reset one (select the compressor and press

) or all (hold

for 2 seconds) of the operation time records. As

ddd

the compressor with VCC modulation is always the first to actuate and the last to shut down it does not enter the rotation, that is, the rotation is made only
with compressors connected to digital outputs.

14.4.3 Dead zone mode:

This Control Mode is used to create a control region around the setpoint without starting and stopping compressors around the setpoint. The dead zone
region is defined by the parameters Lower dead zone differential (

1.2.x.7

) and Upper dead zone differential (

1.2.x.8

Example:

1.2.x.1

Control mode: Dead zone

1.2.x.2

Setpoint: 30psi

1.2.x.4

Hysteresis of On / Off compressors: 12 psi

1.2.x.7

Lower dead zone differential: 10.0 psi

1.2.x.8

Upper dead zone differential: 15.0 psi

1.2.x.15

Number of compressors: 3

Note:

The use of Variable Capacity Compressors (VCC) is not allowed in this control mode.

1.2.x.22

Compressor 1 modulation: On / Off

1.2.x.23

Compressor 2 modulation:On / Off

1.2.x.24

Compressor 3 modulation: On / Off

1.2.x.61

Time between actuations: 30 seconds

1.2.x.62

Time between shutdowns: 60 seconds

Actuation step = Hysteresis of digital outputs / Number of compressors = 12.0 / 3 = 4.0 psi

Without considering the effect of the dead zone, the pressure values for the activation of compressors 1.2 and 3 should be, respectively, 34.0, 38.0 and
42.0 psi.
Considering the effect of the dead zone, no compressor should be activated until the pressure exceeds 45.0 psi, so compressors 1 to 3 are only
activated when the pressure exceeds this value and respecting the time between activations.
If the pressure decreases, entering the dead zone the compressors will remain activated until exceeding the Differential range of the lower dead zone.
One compressor is deactivated immediately, and the others are gradually switched off respecting the time between shutdowns. If the pressure drops
quickly across the instantaneous shutdown ranges, the compressor is shut down immediately. The step for instantaneous shutdown is defined
according to:
Instantaneous shutdown step = Lower dead zone differential / (number of active stages - 1) = 10 / (3-1) = 5
Compressor 3 is shutdown when crossing the lower limit, 20 psi and compressors 1 and 2 are shut down as follows:

Case 1:

If the pressure remains within the range of 20.0 and 15.0 psi. Compressor 2 shuts down 60 seconds after compressor 3 and compressor 1 shuts

down 60 seconds after compressor 2.

Case 2

: If the pressure drops rapidly to the range between 15.0 and 10.0 psi. Compressors 2 and 3 shut down immediately and compressor 1 is shut

down 60 seconds later.

Case 3:

If the pressure drops quickly below 10.0 psi, all compressors are switched off immediately.

14.4.4 Dead Zone Mode with rotation:

The Dead Zone Control Mode is applied together with the rotation, which is given preference to activate compressors with records of shorter time on and
to shutdown compressors with records of longer time on.