Sel 751A - Table 2.6 Current Card Terminal Designation; Table 2.7 Eight Analog Input (8 AI) Card Terminal Allocation; Table 2.8 Four Analog Input;Four Analog Output (4 AI;4 AO) Card Terminal Allocation

2.7
Date Code 20100129 Instruction Manual SEL-751A Relay
Installation
I/O Configuration
Current Card
Supported in Slot Z only, this card provides current inputs for three-phase CTs
and one neutral CT. Secondary phase current ratings are either all 1 A or all
5 A; you cannot order a combination of 1 A and 5 A phase CTs on one card.
However, the phase CTs and the neutral CT can be of different current rating.
You can order one of three neutral CT ratings, 1 A, 5 A, 50 mA, or 2.5 mA
(high sensitivity). With a current card installed, the SEL-751A tracks the
frequency (using positive-sequence current) and samples at 16 times a cycle—
see Processing Specifications on page 1.23 for more information.
Analog Input Card
(8 AI)
Supported in any nonbase unit slot (Slot C through Slot E), this card has eight
analog inputs. Table 2.7 shows the terminal allocation.
Analog Input/Output
Card (4 AI/4 AO)
Supported in any one of the nonbase unit slots (Slot C through Slot E), this card
has four analog inputs and four analog outputs (AO). Table 2 .8 shows the
terminal allocation.
NOTE: The relay uses 3I1 to track the
frequency if 3V1 is not available and
3I1 is greater than 0.25 A (5 A) or
0.05 A (1 A).
Table 2.6 Current Card Terminal Designation
Term ina l Nu mbe r Description
01, 02 IA, Phase A current input
03, 04 IB, Phase B current input
05, 06 IC, Phase C current input
07, 08 IN, neutral current input
Table 2.7 Eight Analog Input (8 AI) Card Terminal Allocation
Term ina l Nu mbe r Software Reference, Description
a
a
x = 3, 4, or 5 (e.g., AI410, AI402, etc., if the card was installed in Slot D).
01, 02 AIx01, Transducer Input number x01
03, 04 AIx02, Transducer Input number x02
05, 06 AIx03, Transducer Input number x03
07, 08 AIx04, Transducer Input number x04
09, 10 AIx05, Transducer Input number x05
11, 12 AIx06, Transducer Input number x06
13, 14 AIx07, Transducer Input number x07
15, 16 AIx08, Transducer Input number x08
Table 2.8 Four Analog Input/Four Analog Output (4 AI/4 AO) Card Terminal
Allocation
Term ina l Nu mbe r Software Reference, Description
a
a
x = 3, 4, or 5 (e.g., AI401, AI402, etc., if the card was installed in Slot D).
01, 02 AOx01, Analog Output number x01
03, 04 AOx02, Analog Output number x02
05, 06 AOx03, Analog Output number x03
07, 08 AOx04, Analog Output number x04
09, 10 AIx01, Transducer Input number x01
11, 12 AIx02, Transducer Input number x02
13, 14 AIx03, Transducer Input number x03
15, 16 AIx04, Transducer Input numberx04
NOTE: Analog inputs cannot provide
loop power. Each analog output is self
powered and has an isolated power
supply.