701 Motor Protection Relay Date Code 20010719
SEL
OGIC
®
Control Equations & Relay Logic
Relay Word Bits
B.6
Table B.2 Relay Word Bit Definitions for SEL-701 (Continued)
Row Bit Definition
47T
Phase Reversal Trip. Asserts when the relay detects a phase
reversal condition, if phase reversal tripping is enabled by the
relay settings.
TRGTR
Target Reset. Asserts for one quarter-cycle when you execute
a front-panel or serial port target reset command, or when a
rising edge of the TARR SEL
OGIC control equation is
detected.
START
Asserts when an internal relay function calls for a motor start.
A motor start only occurs if a relay output contact is
programmed with this relay word bit and connected to close
the motor contactor or circuit breaker.
52A
Asserts when the SEL
OGIC control equation 52A result is
logical 1. Use to indicate that the motor contactor or circuit
breaker is closed.
SPDSTR
Speed Switch Trip. Asserts when the relay does not detect a
speed switch contact closure within a settable period from the
beginning of a motor start, if the function is enabled by relay
settings.
SPEEDSW
Speed Switch Input. Asserts when the SEL
OGIC control
equation SPEEDSW result is logical 1. Used to indicate that
the motor speed switch contact is closed.
RTDBIAS
RTD Bias Alarm. When enabled, asserts when the motor
winding temperature rise is greater than 60°C over ambient
and the RTD % Thermal Capacity is more than ten
percentage points higher than the motor thermal element %
Thermal Capacity. Typically indicates a loss of motor cooling
efficiency.
4
RTDFLT
Asserts when an open or short circuit condition is detected on
any enabled RTD input, or communication with the external
RTD module has been interrupted.
WDGALRM
WDGTRIP
Winding Temperature Alarm and Trip. WDGALRM asserts
when any healthy winding RTD temperature exceeds its
alarm setpoint. WDGTRIP asserts when one or two (when
EWDGV = Y) healthy winding RTD temperatures exceed
their trip setpoints.
5
BRGALRM
BRGTRIP
Bearing Temperature Alarm and Trip. BRGALRM asserts
when any healthy bearing RTD temperature exceeds its
alarm setpoint. BRGTRIP asserts when one or two (when
EBRGV = Y) healthy bearing RTD temperatures exceed their
trip setpoints.
(Continued)
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