Honeywell S7999D1048 Manual page 47

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. 107 and 108). Upper and lower
limits of the water temperature/steam pressure range are
displayed on the page next to the load bar graph.
Fig. 107. Steam PID Load Controller.
Fig. 108. 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).
S7999D1048 COMBUSTION SYSTEM OPERATOR INTERFACE DISPLAY
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 S7999D 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. 109. 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.
47 65-0321—01