FAN SPEED CONTROL ADR 80 - 230
ADR80230_5.04_eng
Project:
ADR Regulator
Revision Doc.:5,0
Date
: 29.05.2009
Page.
12
10.0 SCHEMATIC WORKING DIAGRAM OF ADR REGULATOR
Working principle of the device (in pressure or temperature)
In hand of the temperatures or the pressures and the supply voltage of fan, the graph can be divided into 5 sectors.
Sector 1:
Temperature or Pressure before Start
=> Supply voltage to fan is zero.
Sector 2:
Temperature or Pressure between Start and Set – Proportional Range => Minimum supply voltage to the fan.
Sector 3:
Temperature or Pressure between Set – Proportional Range and Set + Proportional Range => Supply voltage in-
creases proportional between the minimum and the maximum.
Sector 4:
Temperature or Pressure between Set + Proportional Range and Max => Fan supply voltage equal to the maximum
set voltage
Sector 5:
Temperature or Pressure higher then Max
=> Max fan supply voltage (400V, 230V, 460)
Note: The transition from sector 5 to sector 4 has a certain dead band to avoid unwanted hunting between the two working
speeds. Same situation occurs for transition from sector 2 to sector 1. In this case the adjustment will use an adapted dead
band to perform better in accordance to the dynamic characteristics of the cooling system.
