TM 5-810-15
control room will be located at a central location in
tion with other I/O racks and the central control
the plant to allow operating personnel good access
console. Redundant communication links should be
to the boilers and the auxiliary equipment. The
provided to allow communication when one link is
control room will be large enough for the operator
lost. All field wiring entering or leaving the I/O
interface for the boiler and auxiliaries and also
racks is to be connected to terminal blocks with
allow room for a desk to be used by operating
spare terminals provided. The equipment in the 110
personnel.
racks will be designed for installation in a dusty
b. Operator interface. The operator interface to
atmosphere with maximum ambient temperatures
the boiler and auxiliaries may be via CRT*s and
of 50 degrees C.
(b) Operator interface. The control console
printer housed in a control console or operator
will include the appropriate number of CRT*s and
stations, recorders, indicators, annunciators and
start/stop controls mounted on a control panel.
printers required by the size and complexity of the
system. A minimum of two CRT*s and two printers
(1) Distributed control system. Operator inter-
should be installed. The CRT*s and keyboard or
face via CRT and printers are normally used on
larger units and are part of the distributed control
other means of operation will be mounted in a
system. This system should always utilize redun-
console which allows the operators to access and
dant microprocessors, ORT*s and printers. The
operate the controls while sitting at a chair in front
system will automatically switch to the back-up
of the CRT.
(c) Auxiliary panel. Auxiliary panel con-
system and annunciate failure of a component. The
system will be utilized to perform combustion
struction must conform to the requirements of the
control, data acquisition and trending, boiler effi-
National Electrical Code, the National Fire Protec-
ciency calculations, graphic displays, boiler control
tion Association, and NEMA standards. It will be
motor start/stop and ash system controls. An auxil-
constructed of steel plate with adequate internal
iary panel will also be required to mount critical
reinforcement to maintain flat surfaces and to
controls and monitoring equipment.
provide rigid support for the instrumentation to be
(a) I/O racks. The system will include remote
installed. The panel interior will have adequate
mounted input/output racks with redundant
bracing and brackets for mounting of equipment to
microprocessors for control. The information at the
be installed within the panel. Electrical outlets will
I/O rack will be multiplexed to allow communica-
be provided in the panel. No pressure piping of
9-19
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