SIMPRO-100
Glossary
PRIM-2400C 229
Glossary
A
A
Abbreviation for amps or amperes; units of
electrical current magnitude.
Alias
User assigned name of a Relay Word bit used
in the SIMPRO-100 Relay Sequential Events
Recorder (SER) function. The assigned alias
appears in the SER report in place of the
Relay Word bit, making the SER report easier
to review.
Ambient Temperature
Temperature of the motor cooling air at the
cooling air inlet. Measured by an RTD whose
location setting is AMB.
ANSI Standard Device Numbers
A list of standard numbers used to represent
electrical protection and control relays. The
standard device numbers used in this
instruction manual include:
27 Undervoltage Element
37 Underpower Element
46 Phase Balance or Current Unbalance
Element
47 Phase Sequence Element
49 Thermal Element
50 Overcurrent Element
52 AC Circuit Breaker
55 Power Factor Element
59 Overvoltage Element
66 Jogging Device (limits number of
operations within a given time of each
other)
81 Frequency Element
These numbers are frequently used within a
suffix letter to further designate their
application. The suffix letters used in this
instruction manual include:
P Phase Element
G Residual/Ground Element
N Neutral/Ground Element
Q Negative-Sequence (3I2) Element
Antibackspin Protection
Relay function that prevents the motor from
being started for a short time after it is
stopped. Used on pump motors to prevent a
start attempt while fluid is running backward
through the pump.
Antijogging Protection
Relay functions that prevent the motor from
being started too many times within an hour
(also referred to as Starts Per Hour
protection) or too soon following the last start
(also referred to as Minimum Time Between
Starts protection).
Apparent Power, S
Complex power expressed in units of
volt-amps (VA), kilovolt-amps (kVA), or
megavolt-amps (MVA). Accounts for both real
(P) and reactive (Q) power dissipated in a
circuit: S = P + jQ.
ASCII
Abbreviation for American Standard Code for
Information Interchange. Defines a standard
way to communicate text characters between
two electronic devices. The SIMPRO-100
Relay uses ASCII text characters to
communicate using its front- and rear-panel
EIA-232 serial ports.
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