2-20 Specifications Date Code 20011026
SEL-321/321-1 Instruction Manual
Function Label Application
Trip Coil Monitor,
C-phase 1
TCMC1 Monitors Breaker 1, C-phase trip coil
Trip Coil Monitor,
A-phase 2
TCMA2 Monitors Breaker 2, A-phase trip coil
Trip Coil Monitor,
B-phase 2
TCMB2 Monitors Breaker 2, B-phase trip coil
Trip Coil Monitor,
C-phase 2
TCMC2 Monitors Breaker 2, C-phase trip coil
External Trigger EXT Assert to trigger event reports
Logic Point 1 LP1 Controls general purpose element LP1
Logic Point 2 LP2 Controls general purpose element LP2
Logic Point 3 LP3 Controls general purpose element LP3
Logic Point 4 LP4 Controls general purpose element LP4
Logic Point 5 LP5 Controls general purpose element LP5
Logic Point 6 LP6 Controls general purpose element LP6
Logic Point 7 LP7 Controls general purpose element LP7
Logic Point 8 LP8 Controls general purpose element LP8
Logic Point 9 LP9 Controls general purpose element LP9
Logic Point 10 LP10 Controls general purpose element LP10
Ext. Trip Unlatch EXTUL Assert to unlatch TPA, TPB, TPC, and 3PT
Invert the sense of any input assignment by including the SELOGIC control equation invert
operator “!” immediately in front of the input assignment (e.g., !52A1 changes a 52a input to a
52b input).
1
52AA1, 52AB1, and 52AC1 follow 52A1 if they are not assigned to an input.
2
52AA2, 52AB2, and 52AC2 follow 52A2 if they are not assigned to an input.
3
TCMA1, TCMB1, and TCMC1 follow TCM1 if they are not assigned to an input.
4
TCMA2, TCMB2, and TCMC2 follow TCM2 if they are not assigned to an input.
SELOGIC CONTROL EQUATIONS
SELOGIC control equations perform the following tasks:
• Define what conditions assert the output contacts
• Define which elements and conditions trigger event reports
• Select the elements which trip for switch-onto-fault conditions
• Select the elements which trip unconditionally
• Select the elements which trip with communications assistance
Figure 2.2 gives an overview of SEL
OGIC control equations in the SEL-321 Relay.
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