Control Page - ABB C300 Operating Manual

7.2 Control Page

ContrL
PAGE
Time Proportioning
CYCt
5.0
ON/OFF
HYSt
1.0
ProP
100.0
Page Header – Control Page.
If
Heat/Cool Control
Cycle Time
Other
This frame appears only if the
Control
Types
is selected in the
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
. The output turns off at the set point value but does
Time
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.
Set
Point
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.
7 CONTROL LEVEL...
is selected, refer to Section 7.3.
Time Proportioning
Set Up Control Page
function
. Set the required
Cycle
Set Point
+ Hysteresis
Set Point
– Hysteresis
Reverse
Acting
Direct
Acting
23