MANUALE DI ISTRUZIONI / INSTRUCTION MANUAL
RADIATORI REMOTI / DRY COOLERS
RAN-RAL - Rev 1.0. - 11-10-2002 IT - EN
28 (32)
Proportional band regulation (trimmer P2) - PHASE 2
P2
Prop. Band °C
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%)
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
This permits the adjustment of the
Set-poin
t, 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:
Soft start regulation (trimmer P1)
P1
soft- start
m = 2
M = 35
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
control signal.
Position
'M'
(trimmer rotated completely clockwise) decelerates the voltage to load modulation
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).
опубликовано topclimat.ru
