Watlow F4P Series, User Manual, Page: 73 / 124

Wa t l o w S e r i e s F 4 P F e a t u r e s
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7 . 1 5
Remote Set Point
The Series F4P with the enhanced control option can be
configured to support up to two remote set points. This
feature allows the closed-loop, process set point to be
changed remotely.
In remote set point operation the measured process val-
ue of the remote set point input is used as the control set
point in closed-loop operation. Analog inputs 2 and 3 can
be configured as remote set point inputs. Remote set
point (Remote 2 and Remote 3) values are limited in
range to the operating range of the sensor selected for
analog input 1, unless the operating range of the remote
set point input sensor is less than the operating range of
input 1. If that is the case, the remote set point sensor
operating range will be used.
The switch to a remote set point input as the control set
point can be made with a digital input or by selection in
the Operations Menu. Remote set point operation is
masked if it is not enabled in the analog input 2 and 3
menus. Remote set point operation has priority over local
set point operation when selected by one of the four digi-
tal inputs.
Location in software: Setup Page > Analog Input x (2 or
3) and Setup Page > Digital Input x (1 to 4).
Alternate Control
The Series F4P with the enhanced control option can be
configured to have analog input 1 or analog input 2 func-
tion as the sensor input for closed-loop control. This fea-
ture can be used to support the need for redundant sen-
sor operation or where sensor location or sensor type
changes can improve process control.
The transition between inputs is made through the oper-
ation of the designated digital input. To ensure proper
control operation the sensor used for analog inputs 1 and
2 must be the same. The linearization type can be differ-
ent. Example, a K thermocouple can be used on input 1
and a J thermocouple can be used on input 2. The deci-
mal value and unit type follows the input 1 selection.
The Series F4P firmware considers the sensor not being
used to be off. Out-of-operating-range transitions will
cause the Series F4 to switch to the manual mode. Tran-
sitions from outside the set point operating range will
cause the control set point to go to either the low or high
set point limit, which ever is closer.
The alternate input option is only available in normal
control operation. The remote set point and digital set
point features are not available when alternate input op-
eration is enabled.
Location in software: Setup Page > Analog Input 2 and
Setup Page > Digital Input x (1 to 4)
Features in the
Enhanced Series F4P
Controller