CEMP-E
TI 811-12
18 August 1998
(6)
Electrical service changes.
e. Identify Input/Output (I/O) Point Selection. Identify the application programs which relate to the
particular systems identified in each building. The selected application programs will largely determine
the I/O points required for each system and impact the potential economic savings.
f. System Deficiency Survey Report. After a visual inspection and interviews with operations
personnel, note the existing control devices that must be repaired or replaced in order for the system to
be in good working order.
g. Local Controls Interface. In general, existing local control loops will need to be modified to
include the interface required for UMCS supervisory control. During the survey, verify how each control
loop is presently connected and operated and identify the required failure mode for each control loop and
piece of equipment.
h. Electrical Power. At each building, new electrical power will be required for field equipment
panels and other control devices, such as equipment transformers, control actuators, etc. During the
survey, identify where the contractor will obtain power for UMCS devices. Generally, the power source
should be 120/208 volt, 3 phase, 4 wire system. If this power type is not available, make a note in the
survey report so that an estimate of the cost to provide suitable power can be included in the project
budgetary cost estimate.
i. Device Mounting Locations. During the survey, ensure adequate space is available to mount
UMCS components such as field equipment panels, programmable logic controllers (PLCs), data terminal
cabinets (DTCs) and various sensors. If circumstances arise where special space or mounting
considerations will significantly alter the budgetary cost estimate, document this in the survey report.
j. Building Wiring. Note all interior and exterior wall and ceiling construction throughout the building
where wiring will be run. If wiring cannot be installed concealed, note how and where new conduit shall
be installed (for example, install conduit exposed across ceiling of shop area). Also note all ceiling
heights where wiring will be run.
k. Central Station/Island Stations. The recent and continuous advancements in computer
technology have minimized space and power requirements with respect to the Central/Island Stations and
remote workstations. Desktop personal computers are now available with abundant speed and memory to
serve any function in the system. Determine the probable location of the Central Station and note the
availability of communication lines. When fiber optic DTS is specified, locating the Central Station in
buildings with existing fiber optic capacity is highly recommended.
l. Energy Metering. Energy meters should be located at the public utility service point and
additional energy meters may be installed at the building level. The survey requirements for these two
areas are described below.
(1) Main Site Utility Distribution Metering. The electrical meters at the point of service by the
utility company must also be metered by the UMCS if electrical demand limiting is implemented.
Determine the location of all the electrical meters used for billing the facility by the power company. The
UMCS will need to monitor all of the same points. In most cases, this will involve only one main point
where the utility company substation or transformer banks are located. The utility company generally will
provide a meter output from their meter at the request of the customer. This can be verified through the
utility company representative who can also provide an estimate of the cost. If gas or other main utility
metering is being considered, the same approach is recommended for existing meter locations. In many
cases a pulse contact may be added to the existing meter head for the UMCS to monitor.
(2) Building Submetering. For building submetering, there are a number of different energy and
flow measurements available. For gas or liquids, determine the fluid to be measured (gas, water, steam,
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