BE1-951
Testing and Maintenance
13-65
Step 5 Using the values listed in Table 13-102, apply current to the A-phase current input. Begin at the
starting point and then step the current up to just slightly above the low limit for the amount of time
listed. If the active setting group does not change, step the current up to just below the high limit
for the duration indicated. The setting group should change should occur between the low and high
limits. verify that the change occurred within the time limits programmed at an accuracy of +5
percent or +2 seconds, whichever is greater. Step the current up to each new level and verify the
setting group change and pickup accuracy.
Table 13-102. Setting Group Change Example Accuracy Limits-Increasing Current
Sensing
Type
Current Limit
Time
Comments
Low
High
1 A
0.5
0.5
Starting point 50% pickup
0.735
0.765
>1 min
Switch to SG1 (75% SG0 51P)
0.881
0.919
>1 min
Switch to SG2 (90% SG0 51P)
1.176
1.224
5 min
Switch to SG3 (110% SG0 51P)
5 A
2.5
2.5
Starting point 50% pickup
3.675
3.825
>1 min
Switch to SG1 (75% SG0 51P)
4.405
4.595
>1 min
Switch to SG2 (90% SG0 51P)
5.88
6.12
5 min
Switch to SG3 (110% SG0 51P)
Step 6 Verify that SG3 is the active setting group by viewing HMI Screen 1.5.5.
Step 7 Transmit the select and operate commands in Table 13-103 to the relay.
Table 13-103. Automatic Setting Group Control Selection
Command
Purpose
A=
Gain write access
CS-143=1
Selects 143 for TRUE operation
CO-143=1
Executes 143 TRUE operation
EXIT
Exit select and operate mode
Step 8 Verify that no setting change occurred and that SG3 is still active by viewing HMI Screen 1.5.5.
This verifies that the relay will not make any setting group changes from logic inputs while the
AUTO input logic is TRUE.
Step 9 Begin stepping down the current from one level to the next as shown in Table 13-104. First, step
the current down to just below the high limit for the amount of time listed. If the active setting group
does not change, step the current down to just above the low limit for the duration indicated. This
will verify the accuracy of the pickup. Continue stepping the current down to each new level.
