4.34
SEL-749M Relay Instruction Manual Date Code 20080918
Protection and Logic Functions
I/O Configuration
Figure 4.20 Stop/Trip Logic
The trip logic settings including the SELOGIC control equations are described
below.
TDURD MINIMUM TRIP TIME
This timer establishes the minimum time duration for which the
TRIP Relay Word bit asserts. This is a rising edge initiated timer.
Trips initiated by the STOP Relay Word bit (asserted at the front-panel or
by the STOP serial port command) are maintained for at least the duration
of the minimum trip duration time (TDURD) setting.
TR TRIP CONDITIONS SEL
OGIC EQUATION
The SEL-749M Trip Logic offers two ways to stop the protected
motor:
➤ Conditions mapped to TR.
➤ Front panel or serial port (including Modbus
®
and
DeviceNet) STOP command.
Either of the two conditions will trigger an event report. The relay
controls the tripping output contact(s) when the Relay Word bit TRIP
appears in an output contact SEL
OGIC control equation. Default relay
settings have output OUT103 set to TRIP and fail-safe setting OUT103FS
at Y. See Section 2: Installation, Fail-Safe/Nonfail-Safe Tripping on
page 2.13.
NOTE: You can use an indirect
mapping (e.g., SV01T) as in the
factory-default setting. See Tabl e 4. 36
for the SV01 settings.
Set the TR SELOGIC control equation to include an OR-combination of
all the enabled protection element Relay Word bits that you want to cause
the relay to trip. Use the factory-default setting as a guideline.
REMTRIP REMOTE TRIP CONDITIONS SEL
OGIC EQUATION
You can map a control input contact to the REMTRIP to stop the
motor by a contact input to the relay.
0
TDURD
Initiate
Front-Panel
Messages
TRIP
TR
STOP
STOPPED
ULTRIP
TRGTR
RSTTRGT
EMRSTR
ABSLO
TBSLO
NOSLO
THERMLO
Trigger
Events
Relay
Word
Bit
TRGTR = Target Reset Command, Front Panel or Serial Ports
RSTTRGT = Target Reset SEL
OGIC
Control Equation
STOP = Motor Stop Command, Front Panel or Serial Ports
TR = Trip SEL
OGIC
Control Equation
ULTRIP = Unlatch Trip SEL
OGIC
Control Equation
EMRSTR = Emergency Start Command, Front Panel or
Modbus/DeviceNet Command
STOPPED =Motor Stopped Relay Word Bit
ABSLO = Antibackspin Lockout
TBSLO = Minimum Time Between Starts Lockout
NOSLO = Starts-Per-Hour Lockout
THERMLO = Thermal Element Lockout
TDURD = Minimum Trip Time Setting
Courtesy of NationalSwitchgear.com
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