Specifications

Simplex, Inc., 5300 Rising Moon Road, Springfi eld, IL 62711-6228 • 217-483-1600 • Fax [phone]
Merlin-150-300c.indd • © 2011 Simplex, Inc. All Rights Reserved. • Printed in the USA. • www.simplexdirect.com
LOAD BANK MANUAL • Merlin 150-300 Load Bank • page 10 of 15
APPENDIX A - ABBREVIATIONS USED IN THIS MANUAL
Listed below are abbreviations of terms found on Simplex Load Bank Systems. When following a load bank
drawing utilize this guide to defi ne abbreviated system and component names. As this is a master list, draw-
ings and text pertaining to your equipment may not contain all these terms.
AC-Alternating current
AIC-Ampere interrupting
current-maximum short circuit
fault current a component can
safely interrupt
AM-Ammeter
AMSW- Ammeter selector
switch-selects any phase for
current reading
CF-Control fuse
CFM-Cubic feet per minute-
used to rate fan air fl ow ca-
pacity and load bank cooling
requirement
CFR-Cooling failure relay-nor-
mally energized relay in cooling
failure subsystem
CPC-Control power contactor
CPF-Control power fuse
CT-Current transformer- used
in metering circuits
DC-Direct current
EXTS -Exhaust air temperature
switch
FCB-Fan circuit breaker-circuit
breaker in series with fan con-
trol power
FCVR-Fan control voltage
relay-normally energized relay
on relay sub-panel
FM -Frequency meter-monitors
frequency of test source
FMC -Fan motor contactor-con-
trols power to fan motor
FMSW-Frequency meter switch
FPS -Fan power switch-used to
energize cooling system
GFB -Ground fault breaker
GBTR -Ground breaker tripped
relay
HMI-Operator Interface
HVR-High voltage relay
Hz -Hertz-cycles per second,
measurement of frequency
IFCV -Incorrect fan/control voltage
INTS-Intake air temperature
switch
K-Relay coil/contact designation
KVA-Kilovolt amperes
KVAR-Kilovolt amperes-reactive
KW-Kilowatts
KWM -Kilowatt meter
KWT-Kilowatt meter transducer
LM-Louver motor
LMC -Louver motor contactor
LR-Load resistive element
LX -Load reactive element
L1 -Line 1
L2 -Line 2
L3 -Line 3
MCB -Main circuit breaker
MDS -Main Disconnect Switch
MF -Meter fuse
MLB-Main Load Bus
MOT-Motor
NEMA-National electrical
manufacturer’s association
ODP-Open, drip-proof-refers to
motor enclosure
OVR-Overvoltage relay-relay
used in overvoltage failure sys-
tem, located on relay sub-panel
OLR-Overload relay-used for
motor protection
OTR-Overtemperature relay-
used in failure system
PF -Power factor-in resistive
only loads expressed as unity
(1.0), in inductive loads ex-
pressed as lagging, in capaci-
tive loads expressed as leading
PAR -Control power available
relay-relay energized when
control power is available
PFM-Power factor meter
PS -Pressure switch-switch
used to detect fan failure
RR-Reset relay
RTM -Running time meter-
keeps time log of equipment
use.
TB-Terminal block
TDR-Time delay relay-relay
which times out before contacts
change state
TEFC -Totally enclosed, fan
cooled-refers to motor enclo-
sure
TEAO -Totally enclosed, air-
over-refers to motor enclosure
UPS-Uninterruptable power
source
V -Voltage
VSR -Voltage sensing relay
XCB -Reactive load controlling
circuit breaker