Uniflair RAN Series Instruction Manual page 29

Proportional band regulation (trimmer P2) - PHASE 2
P2
Prop. Band °C
The work range indicates the increment to the incoming control signal (°C) used by the Rgf series to pilot the
fans from the minimum voltage (P5) to the maximum voltage (P4).
The work range runs from 2 °C (position "m") to 20 °C (position "M").
With NTC probes, the proportional band MUST NOT be overly restricted, especially in the event of indirect
temperature measurement (e.g. by a contact) in a system that repeatedly varies the value being measured.
Set-Point regulation (trimmer P3) - PHASE 2
P3
Set-point (°C)
SET-POINT 1
Soft start regulation (trimmer P1)
P1 This trimmer adjusts the rapidity with which fan speed is varied ('slow start' and 'slow
stop'), thereby making the system 'slow' or 'fast' depending on the variations in the automatic
soft- start
control signal.
m = 2
Position 'M' (trimmer rotated completely clockwise) decelerates the voltage to load modulation
M = 35
speed.
In position 'm' (minimum), speed variation is almost instantaneous (system "ready").
The voltage regulator is supplied with a minimum slow start/stop time equal to approximately
2 (seconds).
During installation, in order to prevent swings that might be caused by an inappropriate P1
calibration, check the operation of the Rgf series voltage regulator during automatic control.
IMPORTANT!
Never under any conditions modify the position of the trimmers marked by a spot of red paint (Manufacturer's
setting).
RAN-RAL - Rev 1.0. - 11-10-2002 IT - EN
This trimmer is used to set the proportional band, or in other words, the point in
which the automatic control is at the Maximum value (100%)
This permits the adjustment of the Set-point, or in other
words, the work point.
The P3 trimmer is used to set the starting point for
automatic control. The figure shows the values and the
positions of the trimmers in the various configurations:
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