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MCT-MC
4.3
FDC MCT-MC
- 102 -
Device Settings
9.1.2 Heat/Cool (Bimodal) Control
When a loop is programmed for heat/cool operation, the values of the Cooling PB and Dead Band affect the
way the heat and cool outputs work together to control the process.
The
Cooling PB
is measured in % of the proportional band with a range 50-300. Set cooling PB to 100% to
begin and examine the cooling effect. If cooling action should be enhanced then decrease the cooling band. If
cooling action is too strong then increase the cooling band. The value of the cooling proportional band is related
to the heating proportional band and its value remains unchanged throughout any auto tuning procedures.
NOTE:
The adjustment of the Cooling PB is also related to the cooling media used. When air is used as the
cooling media, it is recommended that the Cooling PB be set to 100%. For oil, a typical setting to use
for the Cooling PB is 125%. If water is used as the cooling media then adjust the Cooling PB to 250%.
The adjustment of
Dead Band
is more dependent upon system requirements. If more positive values of dead
band (greater dead band) are used, an unwanted cooling action can be avoided but an excessive overshoot
may occur. If more negative values of dead band (greater overlap) are used, an excessive overshoot can be
minimized but an unwanted cooling action may occur.
Dead band is adjustable in the range of -36.0% to 36.0 % of the heating proportional band. A negative dead
band value provides an overlap between heating and cooling action in which both outputs can be active at the
same time. A positive dead band value provides a dead band area in which neither output is active around set
point.
9.2 Alarms
The alarm screen allows the user to edit the alarm set points and alarm messages that will be displayed on the
alarm screen should the alarm be activated.
The alarm numbers,
Alarm #
, identify the alarms currently shown on the screen. The left and right scroll buttons
at the upper right of the screen will be shown if more than two alarms are available so that the user can access
each alarm by pressing left or right to go to the previous or next alarm.
The alarm
SP
(set point) description displays the loop name that the alarm is assigned to as well as the alarm
type. The alarm type and alarm hysteresis is defined by the OEM in the MC configuration and can not be
changed. Only the alarm set point can be changed by the user.
Содержание MCT-MC 4.3
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