Glossary
SIMPRO-100
230 PRIM-2400C
Assert
To activate; to fulfill the logic or electrical
requirements needed to operate a device. To
apply a short-circuit or closed contact to a
SIMPRO-100 Relay input. To set a logic
condition to its true state (logical 1). To close
a normally-open output contact. To open a
normally-closed output contact.
B
Breaker Auxiliary Contact
A spare electrical contact associated with a
circuit breaker that opens or closes to indicate
the breaker position. A form-a breaker
auxiliary contact (ANSI Standard Device
Number 52A) closes when the breaker is
closed, opens when the breaker is open. A
form-b breaker auxiliary contact (ANSI
Standard Device Number 52B) opens when
the breaker is closed and closes when the
breaker is open.
C
Checksum
A numeric identifier of the firmware in the
relay. Calculated by the result of a
mathematic sum of the relay code.
CID
Abbreviation for Checksum Identifier. The
checksum of the specific firmware installed in
the relay.
Contiguous
Items in sequence; the second immediately
following the first.
CR_RAM
Abbreviation for Critical RAM. Refers to the
area of relay Random Access Memory (RAM)
where the relay stores mission critical data.
CRC-16
Abbreviation for Cyclical Redundancy
Check-16. A mathematical algorithm applied
to a block of digital information to produce a
unique, identifying number. Used to ensure
that the information was received without data
corruption.
CT
Abbreviation for current transformer.
Current Unbalance Element
Protection element that calculates the
magnitudes of the measured phase currents,
calculates the average of those magnitudes,
determines the magnitude with the largest
deviation from average. It then calculates the
difference between the magnitude average
and magnitude of the phase with the largest
deviation from the average. Finally, the relay
calculates the percent unbalance current by
dividing the difference value by the motor
rated full load amps or by the average
magnitude, whichever is larger. Unbalance
current causes heating in the rotor of the
protected motor. The unbalance element can
trip the motor in the presence of heavy
unbalance to prevent rotor damage due to
overheating. In the SIMPRO-100 Relay, this
element works together with the motor
thermal element which also provides
unbalance current protection.
D
Deassert
To deactivate; to remove the logic or electrical
requirements needed to operate a device. To
remove a short-circuit or closed contact from
a SIMPRO-100 Relay input. To clear a logic
condition to its false state (logical 0). To open
a normally-open output contact. To close a
normally-closed output contact.
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