701 Motor Protection Relay
Date Code 20010719
SEL
OGIC®
Control Equations & Relay Logic
Selected Relay Logic Diagrams
B.40
Figure B.17
Load-Jam Elements Logic.
Figure B.18
Load-Loss Logic; No Voltage Option.
Load Jam
Trip Delay Timer
LJTPU
I1
Setting
RUNNING
Relay
Word
Bit
Setting
Relay
Word
Bit
LJTDLY
0
JAMTRIP
LJTPU =
I1 =
RUNNING =
LJTDLY =
JAMTRIP =
Load-Jam Trip Pickup
Positive-Sequence Current Magnitude
Motor is Running
Load-Jam Trip Delay
Load-Jam Trip
LJTPU
OFF
STARTING
RUNNING
LLAPU
OFF
Rising
Edge Detect
Load Loss
Trip Delay Timer
Relay
Word
Bits
LOSSTRIP
LOSSALRM
LLTPU • FLA
LLAPU • FLA
Load Loss
Start Delay Timer
Relay
Word
Bits
0
LLTDLY
LLSDLY
0
I
1
Load Loss
Alarm Delay Timer
LLADLY
0
I
1
I
1
=
STARTING =
RUNNING =
LOSSTRIP =
LOSSALRM =
Positive-Sequence Current
Motor is Starting
Motor is Running
Load Loss Trip
Load Loss Alarm
LLTPU =
FLA =
LLAPU =
LLTDLY =
LLSDLY =
LLADLY =
Load LossTrip Pickup Setting
Full Load Amps Setting
Load Loss Alarm Pickup Setting
Load Loss Trip Delay Setting
Load Loss Start Delay Setting
Load Loss Alarm Delay Setting
Summary of Contents for SEL-701
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