23
7.2
Control Page
Information. Hysteresis is used with ON/OFF control to
give acceptable control without causing the output to
switch too rapidly.
Proportional Band
Set the proportional band value required, between 0.1 and
999.9% in 0.1% increments.
Continued on next page.
Page Header – Control Page.
If
Heat/Cool Control
is selected, refer to Section 7.3.
Cycle Time
This frame appears only if the
Time Proportioning
function
is selected in the
Set Up Control Page
. Set the required
cycle time between 1.0 and 300 in 0.1 second increments,
or if 'ON/OFF' mode is required, select cycle time below
1.0 second.
Hysteresis
This frame appears only if ON/OFF is selected in
Cycle
Time
. The output turns off at the set point value but does
not turn on again until it has moved into the safe region by
an amount equal to the hysteresis value. This is only
applicable to 'ON/OFF' control. Set the required hysteresis
between 0.0% and 5.0% of the enginering span.
The display is in engineering units.
7
CONTROL LEVEL…
ContrL
CYCt
5.0
HYSt
1.0
ON/OFF
PAGE
Time Proportioning
Other
Control
Types
ProP
100.0
Set
Point
Reverse
Acting
Direct
Acting
Set Point
+ Hysteresis
Set Point
– Hysteresis
