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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
EN2B-0285GE51 R0909
16
Abbreviations and Definitions
CARE Computer Aided Regulation Engineering;
the PC based tool used to configure
LonWorks devices.
CPU Central Processing Unit; an EXCEL 5000
®
System controller module.
Echelon
®
The company that developed the
L
ONWORKS
®
network and the Neuron
®
chips
used to communicate on it.
EMI Electromagnetic Interference; electrical
noise that can cause problems with
communications signals.
EMS Energy Management System; refers to the
controllers and algorithms responsible for
calculating optimum operational parameters
for max. energy savings in the building.
EEPROM Electrically Erasable Programmable Read
Only Memory; the variable storage area for
saving user setpoint values and factory
calibration information.
EPROM Erasable Programmable Read Only
Memory; the firmware that contains the
control algorithms for the Excel 10 FCU
Controller.
Firmware Software stored in a nonvolatile memory
medium such as an EPROM.
I/O Input/Output; the physical sensors and
actuators connected to a controller.
I x R I times R or current times resistance; refers
to Ohms Law: V = I x R.
K Kelvin.
L
ONWORKS Echelon® LONWORKS® network for
communication among Excel 10 FCU
Controllers.
NEC National Electrical Code; the body of
standards for safe field-wiring practices.
NEMA National Electrical Manufacturers
Association; the standards developed by an
organization of companies for safe field
wiring practices.
NV Network Variable; an Excel 10 FCU
Controller parameter that can be viewed or
modified over the L
ONWORKS network.
OEM Original Equipment Manufacturer; the
company that builds the fan coil units.
PC Personal Computer.
Pot Potentiometer. A variable resistance
electronic component located on Excel 10
wall modules. Used to allow user-adjusted
Setpoints to be inputted into the Excel 10
FCU Controller.
segment A L
ONWORKS section containing no more
than 60 Excel 10s. Two segments can be
joined together using a router.
Subnet An L
ONWORKS segment that is separated by
a router from its Q7750A Zone Manager.
TOD Time-Of-Day; the scheduling of Occupied
and Unoccupied times of operation.
VA Volt Amperes; a measure of electrical power
output or consumption as applicable to an
ac device.
Vac Voltage alternating current; ac voltage as
opposed to dc voltage.