Watlow Series F4S/D - Manual (Page 67)

Wa t l o w S e r i e s F 4 S / D F e a t u r e s ■ 6 . 3
Set Point Low Limit and High Limit
The controller constrains the set point to a value
between a low limit and a high limit. The high lim-
it cannot be set higher than the sensor high limit
or lower than the low limit. The low limit cannot be
set lower than the sensor low limit or higher than
the high limit.
You can view or change the input low limit (SP Low
Limit) and the input high limit (SP High Limit) for
analog inputs 1, 2 or 3.
Location in software: Setup Page > Analog Input x
(1 to 3).
Figure 6.3a — Sensor Ranges.
Set Point Range (must be between SP Low Limit and SP High Limit)
Low Limit of selected Sensor Range
High Limit of selected Sensor Range
Temperature
SP High Limit Range (between High Limit of Sensor and SP Low Limit)
SP Low Limit Range (between Low Limit of Sensor and SP High Limit)
SP Low Limit
SP High Limit
Event
With an event input an operator can perform cer-
tain operations on a system by opening or closing a
switch or applying a dc logic signal to the con-
troller. This feature can add convenience, safety or
security to a system.
In the Series F4, digital inputs 1 to 4 can be as-
signed as wait for events, as well as other process
control features.
Location in software: Setup Page > Digital Input x
(1 to 4) Condition.
High Scale and Low Scale
When an analog input is selected as a process in-
put, you must choose a value to represent the low
and high ends of the current or voltage range. For
example, if an analog input with a process sensor
type 4 to 20mA is selected and the units are % Rel-
ative Humidity, then 0% could represent 4mA and
100% could represent 20mA. The set point will be
limited to the range between scale low and scale
high.
Location in software: Setup Page > Retransmit
Output x (1 or 2).
Retransmit
Retransmit outputs 1 and 2 can retransmit an ana-
log signal to serve as an input variable for another
device. The signal may serve as a remote set point
for another controller or as input for a chart
recorder to document system performance over
time.
Location in software: Setup Page.