S7999B SYSTEM DISPLAY
45
65-0283—2
PID Load Controller
Current load water temperature or steam pressure is obtained
from the UDC controller and displayed in text value and in a
bar graph on the page (see Fig. 89 and 90). Upper and lower
limits of the water temperature/steam pressure range are
displayed on the page next to the load bar graph.
Fig. 89. Steam PID Load Controller.
Fig. 90. Water Temperature Load Controller.
The control setpoint for PID modulation is obtained from UDC
controller and displayed on the page. The control setpoint can
also be adjusted on this page. The control setpoint is set by
the user using the Up Arrow and Down Arrow buttons. The
UDC controller modulates the burner control toward this target
setpoint.
Status of the On-Off relay is obtained from the UDC controller.
An LED displayed on the page indicates when demand is on
(green) or off (red).
If a Low Fire Hold alarm is configured in the UDC controller,
the setpoint of this alarm is obtained from the UDC controller
and displayed on the page. The status of the alarm is
displayed on the page with an LED that is red when Low Fire
Hold has occurred and green when the system isn’t in Low
Fire Hold.
The user can adjust the alarm setpoint of both alarms. Manual
control of the UDC controller output is also permitted by
selecting the yellow “Auto Output” button. Adjustment is
raised or lowered in 1% (0.16 mA) increments. The S7999B
System password (same as Setpoint Adjustment) is required
before manual control is permitted. After successful login, the
Up Arrow and Down Arrow buttons can be used to change the
alarm setpoints.
PID modulation output is obtained from UDC controller and
displayed on the page in text value (mA).
Feed Pump Level Controller
The current water supply level (percent full) is obtained from
the UDC controller and displayed both in text value and in a
bar graph on the page. Upper (100%) and lower (0%) limits
are displayed next to the bar graph.
Fig. 91. Feed Pump Level Controller.
Status of the Start-Stop relay in the UDC controller is
displayed on the page as an LED that is green when the relay
is in Start mode and red when the relay is in Stop mode. The
Start Pump and Stop Pump setpoints (in percent) are obtained
from the UDC controller and displayed on the page. The user
can adjust these Start Pump and Stop Pump setpoints with the
Up Arrow and Down Arrow buttons. Successful password
login is required before the setpoints can be adjusted.
If a High Water alarm is configured in the UDC controller, the
setpoint of this alarm is displayed on the page. The status of
the alarm is indicated by an LED that is red when a status and
high water condition exists, and green when safe water level
exists. The user can adjust the alarm setpoint on the page.