DIN NANO 3RK
Chapter 5
– Data programming
Rev. 01-16
Page 20
OPERATING MODE
The mOd variable allows the operating mode of the controller to be selected.
PLEASE NOTE: the change of the mOd involves the loading of the default settings dedicated on variables
marked with an asterisk in the "default mOd" column and is therefore the first variable that must be set at the
first start-up.
With
mOd=0
you have the Compressor management with digital outputs and sideband type adjustment.
The LED icon (10) turns on to identify the compressors control.
The adjustment pressure sensor (terminals 23 /24) is connected to the inlet pressure sensor.
Based on the value of the "SP" (set point), "r0" and "NO" parameters, the control calculates the various
points of insertion and deactivation of the compressor outputs (steps) by placing the various start-ups and
switching off within the r0 differential range. Each step has an r0/NO differential (where NO is the total
number of compressors).
The combination of the outlets to the steps depends on the setting of the Seq. variable.
For example, considering seq = 1 and mOd = 0, for Output No. 2, insertion will take place at SP+(r0/NO)*2
(the constant 2 indicates step 2) and deactivation will take place at SP+(r0/NO)*1 (See graph 1).
The number of compressors inserted depends on the deviation between the value measured by the
adjustment pressure sensor (positioned at vacuum) and the set vacuum Set Point.
CONTROL IN THE EVENT OF ALARMS
With the presence of alarms (alarm outputs 1, 2 and 3 alarm inputs enabled), operation is maintained equal
but the output relating to the alarm in the sequence and the relative alarm is shown on the display (EC1, EC2
or EC3).
5.13