Watlow Series SD PID Profiling Controller - Manual (Page 67)

Wa t l o w S e r i e s S D • 6 5 • C h a p t e r 1 2 F e a t u r e s
Time
Temperature
Temperature Reading
from Sensor
Actual Process Temperature
Negative Calibration Offset will
compensate for the difference
between the Sensor Reading and
the Actual Temperature
Filter Time Constant
Filtering smoothes an input signal by applying a first-
order filter time constant to the signal. The displayed
value, the controlled value or both the displayed and
controlled values can be filtered. Filtering the displayed
value makes it easier to monitor. Filtering the signal may
improve the performance of PID control in a noisy or
very dynamic system.
Select filter options with Input Filter [Ftr;E]. Select
the Filter Value with [FLtr] (Setup Page).
Unfiltered Input Signal
Time
Temperature
Filtered Input Signal
Time
Temperature
Sensor Selection
You need to configure the controller to match the
input device, which is normally a thermocouple, RTD or
process transmitter. When you select an input device, the
controller automatically sets the input linearization to
match the sensor. It also sets high and low limits, which
in turn limit the set point range-high and range-low val-
ues.
Select the sensor type with Sensor Type [`SEn]
(Setup Page).
Access Lockout
The user’s access to the Operations Page can be con-
trolled through the [`LOC] parameter. The [`LOC] pa-
rameter appears at the end of the Setup Page. It does not
affect the Setup, Factory or Programming Pages.
[```0] All the Operations Page parameters may be viewed
or changed. Full access to profiles on profiling version.
[```1] The set point, process value, auto-manual selec-
tion and alarm settings are the only visible Operations
Page parameters. Set point is adjustable in this level.
Auto-manual selection and autotune are permitted. Dur-
ing manual operation, the percent power is adjustable.
Full access to profiles on profiling version.
[```2] The set point, process value, auto-manual selec-
tion and alarm settings are the only visible Operations
Page parameters. Set point is adjustable in this level.
Auto-manual selection is permitted. During manual op-
eration, percent power is adjustable. Can run profiles, but
cannot enter or edit profile information on profiling ver-
sion.
[```3] The set point, process value and alarm settings
are the only visible Operations Page parameters. Set
point is adjustable. Auto-manual selection is not permit-
ted. During manual operation, percent power is adjust-
able. No access to profile functions on profiling version.
[```4] The set point and process values are the only
visible Operations Page parameters, set point is not ad-
justable. During manual operation, percent power is not
adjustable. No access to profile functions on profiling ver-
sion.
Set Point Low Limit and High Limit
The controller constrains the set point to a value be-
tween a SP low limit and a SP high limit. Note: To stop
the Series SD controller from controlling to a set point,
press the Down Key while the set point value is equal to
the SP.Lo setting.
[`Off] will be displayed in the lower
display and the controller will no longer attempt to main-
tain a set point.
Set the set point range with Set Point Low Limit
[SP;Lo] and Set Point High Limit [SP;hi] (Setup Page).
Set Point Range (must be between Range High and Range Low)
Low Limit of selected Sensor Range
High Limit of selected Sensor Range
Temperature
Range High Range (between High Limit of Sensor and Range Low)
Range Low Range (between Low Limit of Sensor and Range High)
Range Low
Range High