UPSB220 Uninterruptible Power Supply Caterpillar

Glossary

Usage:

UPSB 220 JFA

@ - At

/ - And/or

+/- - Plus or Minus

≤ - Equal to or less than

# - Number

°C - Degree Celsius

°F - Degree Fahrenheit

Ø - Phase angle

Ω - Ohm, unit of resistance

® - Trademark

AC or ac - Alternating current, also implies root-mean-square (RMS)

Ah - Amp hour

Ambient noise - Acoustical noise of surrounding environment

Ambient temperature - Temperature of surrounding air

ANSI - American National Standard Institute

AWG - American Wire Gauge. A standard unit for measuring wire cross-sectional area

BTU or Btu - British thermal unit. Defined as the amount of heat required to raise the temperature of 1 lb of water by 1°F

BYPASS mode - Load is powered by the bypass input line through the static switch

Bypass static switch - Internal automatic bypass

C, Caps, Capacitors - Device that can hold a charge to filter unwanted fluctuations

CAN - Controller Area Network, Cat 5 communication connection cables

CB - Circuit breaker

Cell - Primary unit of a battery which is typically 2.25 VDC

Cde th - Command Thyristor Signal

Choke - An inductor which is intended to filter or choke out unwanted signals

Chopper - Inductive filter used to provide high impedance to an undesirable frequency

Commutation - Reversing of current direction to turn on and off thyristors in a UPS Rectifier or Inverter

Contactor - An electrically controlled switch (a relay) used for switching a power or control circuit. KA1 and KA2 are contactors.

Critical load - Equipment that must have an uninterrupted power input to prevent damage

CT - Current Transformer

DC or dc - Direct current, or voltage

Delta - 3-phase circuit configuration typically without a neutral line

Diode - Semiconductor device that will conduct current in only one direction

Earth ground - A ground circuit that has contact with the earth

Electrolyte - Acid solution surrounding battery cells to create chemical reaction for battery power

ELV - Extra-Low Voltage

ELM - Electro Magnetic Interference. Magnetically induced noise from power lines and transformers.

EPO - Emergency Power Off

Genset - Generator

GND - Electrical ground

H or Hr - Hour

Hz - Hertz, frequency measurement unit, 1Hz is1 cycle per second

I - Current

In - Nominal current

I/O - Input/outupt

IEC - International Electrotechnical Commission

IEEE - Institute of Electrical and Electronic Engineers

Inverter - An electrical circuit that generates an AC voltage source from a DC voltage source

IGBT - Insulated gate bipolar transistors. Power transistor that uses voltage to turn on and off.

In - Nominal current or current nominal

I/O - Input/Output

Inductor - A passive device that stores electrical energy in the form of a magnetic field. Normally consists of a wire loop or coil. Inductors are typically used to smooth out voltage fluctuations in power supply circuits.

Internal Bypass - Static Bypass (Internal Bypass) - Is the bypass which will support the critical load when the inverter is not online. Function is automatic.

Inverter - An electrical circuit that generates an AC voltage source from a DC voltage source

JBUS - A high speed interconnect that provides packet-switched, split-transaction features

KA1 and KA2 - UPS Contactors. KA1 - Mains Input Contact Switch. KA2 - Bypass Input Contact Switch.

KVA - Kilovolt-Ampere is equal to 1000 Volt-Ampere

KW - True power. Kilo-Watt = 1000 w

L - Line

LCD - Liquid-Crystal Display

LCM - Life Cycle Maintenance/Monitoring

LED - Light Emitting Diode

LEM - Current transformer

Mains or Mains 1 - Main AC input source (Q1)

Mains 2 - Bypass AC input source (Q4S)

Maintenance bypass - The wrap around bypass which will support the critical load when the unit is shut down. Function is manual and can be internal to the UPS module or external to the UPS.

mA - Milliampere

MAX, max - Maximum

M, Min, Mins - Minutes

MMI - Man Machine Interface

Modbus -

mSec, msec - Millisecond

mV - Millivolt

N - Neutral

NC - Normally closed

NEC - National Electrical Code

NFPA - National Fire Protection Association

NMC - Network Communication Card

NO - Normally open

NTC - Negative Temperature Coefficient

PN - Part number

Pn - Nominal power

On-line mode - Inverter output power is the primary energy source to load

OSHA - Occupational Safety and Health Agency

Outage - Loss of commercial power

PCA - Printed circuit assembly

PCB - Printed circuit board. Insulating board containing conductive tracks for circuit connections

PF - Power Factor

PFC - Power Factor Corrected

PFC Boost Rectifier - Rectifier used in the UPS

PN - Part number

Pn - Nominal power

Power Factor - The ratio of the actual power of an alternating or pulsating current. Ratio is measured by a wattmeter, to the apparent power, as indicated by ammeter and voltmeter readings. The power factor of an inductor, capacitor, or insulator is an expression of the losses.

Power Factor Correction - Design technique normally applied at the input of off-line converters. Improves the power factor and minimizes harmonics generated by the converter onto the AC power line.

PWM - Pulse Width Modulation. Pattern of firing signals in a pulse train to generate a sine wave

Q1 - UPS input isolation switch

Q3BP - UPS maintenance bypass switch

Q4S - UPS bypass switch

Q5N - UPS output switch

RC - Resistor capacitor

Rectifier - An electrical circuit that generates DC voltage from an AC voltage source

Redundancy - Inclusion of secondary components in a system to back up the primary components

Remote Emergency Power Off - A switch used for shutting down electrical equipment from a location away from the equipment

REPO - Remote Emergency Power Off

RMS - Root Mean Square

RS232 - An asynchronous serial data interchange standard. RS-232 links between equipment are normally limited to 50 feet (16 m).

S, s - Second

Sag - Short-term drop in commercial power electricity

SBC - System Bypass Cabinet

SCR - Silicon controlled rectifier

SCR - Silicon controlled rectifier. Three-terminal active device that acts as a gated diode. The gate terminal is used to turn on the device allowing current to pass from cathode to anode.

Sec - Second

SELV - Safety Extra-Low Voltage

Sinusoidal - Varying in proportion to the sine of an angle or time function. AC voltage in which the instantaneous value is equal to the sine of the phase angle times the peak value.

Slew Rate - Transfer speed of inverter to static switch

Static Bypass - Is the bypass which will support the critical load when the inverter is not online. Function is automatic.

SS, Static Transfer - A solid state switching mechanism electronically controlled to pass AC power directly from the utility to an output load

Static Transfer - A solid state switching mechanism electronically controlled to pass AC power directly from the utility to an output load

STC - Static Transfer Switch

Surge - Short-term rise in commercial power electricity

System Bypass - The external wrap around bypass which can isolate an existing maintenance bypass.

TB - Terminal Block

Test connector - DB-9 type connector on the LCD panel allowing the UPS systems customer support service technician to access programmable and diagnostic features of the system

THD - Total Harmonic Distortion. Quality of power generation due to presence of harmonics

THDI - Total Harmonic Distortion Interference

Thyristor - Special type of semiconductor used to switch on and power such as an SCR or Diode

TN - Transistor

UL - Underwriters Laboratories, Inc

Unitary - Single unit

UPS - Uninterruptible Power Supply

V - Volts

VA - Volt-amperes, unit for apparent power measurement, equal V x I

VAC - Voltage of AC type

VDC, Vdc - Voltage of DC type

Vfmax - Maximum Forward Voltage