J&E Hall JEHSD-0400-B3-M-3, Technical Manual

Page: 27 / 44

Issue: 01.08.2020
Control Logic
Parameters for neutral zone compressor control
1. Preset differentials for neutral zone, activation
Neutral zone
The operating principle is schematized in the above figure:
Inside the neutral zone the capacity request sent by the controller is constant (except when there is a modulation device and
modulation is enabled inside the neutral zone) and the value satisfies the pressure control request in those specific operati
conditions. Therefore within this zone no device is stopped or started.
In the decrease zone, the request also decreases at a rate that depends on the deviation from the set point, and vice
increase zone the request increases proportionally to
For the increase and decrease zones, the following can be used:
• Fixed times: the request decreases or increases constantly as time elapses.
• Variable times: the request decreases or increases more quickly (according to the settings) a
increases.
Note: The figure shows the increase and decrease with fixed times.
Parameters for neutral zone compressor control
Preset differentials for neutral zone, activation zone and deactivation zone.
The operating principle is schematized in the above figure:
Inside the neutral zone the capacity request sent by the controller is constant (except when there is a modulation device and
modulation is enabled inside the neutral zone) and the value satisfies the pressure control request in those specific operati
nditions. Therefore within this zone no device is stopped or started.
In the decrease zone, the request also decreases at a rate that depends on the deviation from the set point, and vice
increase zone the request increases proportionally to the deviation.
For the increase and decrease zones, the following can be used:
• Fixed times: the request decreases or increases constantly as time elapses.
• Variable times: the request decreases or increases more quickly (according to the settings) as the deviation from the set point
Note: The figure shows the increase and decrease with fixed times.
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zone and deactivation zone.
Inside the neutral zone the capacity request sent by the controller is constant (except when there is a modulation device and
modulation is enabled inside the neutral zone) and the value satisfies the pressure control request in those specific operating
In the decrease zone, the request also decreases at a rate that depends on the deviation from the set point, and vice-versa in the
s the deviation from the set point