RGF 300
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4.6 SOFT-START regulation (P1 trimmer)
P1
Soft-Start
m = 2”
M = 10”
Adjusts the rapidity with which the fan speed varies (
'slow start'
and
'slow stop'
); in
practice it makes the system 'slow' or 'fast' depending on the change in the automatic control
signal.
In the
'M'
position (trimmer completely turned clockwise), the variation speed is slowed to
the maximum (system slow to vary).
In the
'm'
position (minimum), speed variation is almost instantaneous ('fast' system).
The cutting regulators is provided with a minimum
Soft-Start
time equal to circa
2
seconds
(
P1=m
) to avoid possible hunting that might be caused by an excessively slow system.
fig. 37
4.7 MANUAL regulation (P7 trimmer)
P7
MANUAL
m = 0% (o P6)
M = 100%
Adjusts the operating speed in
MANUAL
mode:
it allows a constant output voltage value to be set from between 100% and the
CUT-OFF
(
P6
), value using trimmer
P7
.
Once
S1
is closed with a ‘
0
V
’ potential contact, turn
P7
anticlockwise starting from
position
M
until the desired voltage value is reached.
The standard preset position for
P7
is ‘
M
’.
fig. 38
WARNING !
The position of trimmers marked with a spot of red paint (factory calibration)
must not be altered
m
100% 40%
m
cc
MANUAL output
setting
20% 40% 100%
0
400
Vac
P6
P7
%C
MM
P4
m
10” 2”
m
cc
SOFT-START
setting
MM
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