Eliwell RGF 312 - Page 39

RGF 300
39/53
Version M for 4/20 mA active sensors:
ranges from: -
0.4 mA
(trimmer in position '
m
' )
-
2.1 mA
(trimmer in position '
c
' )
-
4.0 mA
(trimmer in position '
M
' ).
The current signal is tied to the scale amplitude of the transducer used.
In the case of pressure control (which occurs most frequently), the value of the
mA/Bar
ratio changes
depending on the pressure transmitter scale.
Version V for 0/10 Vdc active sensors:
ranges from: -
0.30 Vdc
(trimmer in position '
m
' )
-
1.75 Vdc
(trimmer in position '
c
' )
-
3.50 Vdc
(trimmer in position '
M
' ).
For
Vdc / set physical quantity
correspondence, refer to the characteristics of the sensor used.
Versions X and Y for NTC sensors ( °C )
:
ranges from: -
3.0 °C
(trimmer in position '
m
' )
-
18.0 °C
(trimmer in position '
c
' )
-
30.0 °C
(trimmer in position '
M
' ).
4.4.2 Versions with SLAVE regulator operation
In this case, the
rgf300
is subjected to a control signal (automatic or manual) generated by a remote
controller.
Trimmer
P2
only determines the maximum voltage supplied to the fan corresponding to the maximum
control signal received by the regulator from the remote controller:
20 mA
for the
SLAVE M
version, and
10 Vdc
for the
SLAVE V
version.
Starting with the trimmer in position ‘
m
’ and remote control at maximum (
20 mA
or
10 Vdc
), check the
value of the voltage supplied to the load.
It is at maximum (100%) when the trimmer is roughly in the position shown in
fig. 33
with the control signal
in mA and Vdc.
In this configuration, the
DIRECT
or
REVERSE
mode is determined by the external controller.
N.B
.:
in the SLAVE configuration the P2 trimmer is already calibrated and varnished to hold its
position in the factory and must NOT be altered.
fig. 33
m
100% 100%
m
Setting Max. output at
max. INPUT of mA/Vdc
40% 100%
0
400
Vac
P2
%C
MM
20 mA 10 Vdc