Watlow CLS200 - Manual (Page 108)

Chapter 4: Setup CLS200 Series User’s Guide
92 Watlow Anafaze Doc.# 0600-3050-2000
larger value results in a slower, or more dampened, re-
sponse to changes in the process variable.
Selectable values: 0 to 255. 0 disables the output filter.
Spread
For a loop using on/off control, the spread is the control hys-
teresis. This determines the difference between the point at
which a heat output turns off as the temperature rises, and
the point at which it turns back on as the temperature falls.
For a loop using PID control, the spread determines how
far the process variable must be from the setpoint before
the controller can switch from heating to cooling. A loop
will not switch from heat to cool or vice versa unless the
process variable deviates from setpoint by more than the
spread.
When the loop is using PID control and the spread is set to
0, the PID calculation alone determines when the heat or
cool output should be on.
Selectable values: 0 to 255, 25.5, 2.55, .255, or.0255,
depending upon the DISP FORMAT setting.
Restore PID Digital Input
To enable the sensor failure recovery feature, select a digi-
tal input at this parameter. If the specified input is held
low when the sensor fails, the loop returns to automatic
control after a failed sensor is corrected.
Selectable range: NONE (disable the sensor failure recov-
ery feature), 1 to 8.
ALARM
01 HEAT CONTROL
FILTER ? 3
ALARM
01 SPREAD ?
5
ALARM
01 RESTORE PID
DIGIN ? NONE