BE1-951
Testing and Maintenance
13-27
Step 3 Using Table 13-27 as a guide, transmit the first row of setting commands (minimum pickup setting)
for your sensing type.
Table 13-27. 51P/51N/51Q Pickup Settings
Current
Sensing
Input
Type
Pickup Settings
Purpose
Phase
Neutral
Neg. Sequence
5 A
S0-51P=0.5,0,I2,N
S0-51N=0.5,0,I2,N
S0-51Q=0.5,0,I2,N
Sets 51PNQ PU at
0.5 A
S0-51P=5.0,0,I2,N
S0-51N=5.0,0,I2,N
S0-51Q=5.0,0,I2,N
Sets 51PNQ PU at
5.0 A
S0-51P=25.0,0,I2,N
S0-51N=25.0,0,I2,N
S0-51Q=25.0,0,I2,N
Sets 51PNQ PU at
25.0 A
1 A
S0-51P=0.1,0,I2,N
S0-51N=0.1,0,I2,N
S0-51Q=0.1,0,I2,N
Sets 51PNQ PU at
0.1 A
S0-51P=1.0,0,I2,N
S0-51N=1.0,0,I2,N
S0-51Q=1.0,0,I2,N
Sets 51PNQ PU at
1.0 A
S0-51P=5.0,0,I2,N
S0-51N=5.0,0,I2,N
S0-51Q=5.0,0,I2,N
Sets 51PNQ PU at
5.0 A
Step 4 Slowly increase the A-phase current until OUT1 (51P pickup indicator) closes. Verify that pickup
occurs within the specified accuracy listed in Table 13-28. Slowly decrease the applied current until
OUT1 opens. Dropout should occur at 93 to 97 percent of pickup. Verify 51A and 51N targets on
the HMI. Repeat step4 while monitoring OUT2(51N). Verify the pickup and dropout accuracy of the
middle and upper pickup settings for your sensing type.
Table 13-28. 51P/51N Element Accuracy
Sensing Type
Pickup Accuracy
A or B (1 A)
+2% or +10 mA
D, E, or F (5 A)
+2% or +50 mA
Step 5 Slowly increase the A-phase current until OUT3 (51Q pickup indicator) closes (3 x A-phase value).
Verify that pickup occurs within the specified accuracy listed in Table 13-29. Slowly decrease the
applied current until OUT3 opens. Dropout should occur at 93 to 97 percent of pickup. Verify the
51Q target on the HMI. Verify the pickup accuracy of the middle and upper pickup settings for your
sensing type.
Table 13-29. 51Q Element Accuracy
Sensing Type
Pickup Accuracy
A or B (1 A)
+2% or +10 mA
D, E, or F (5 A)
+2% or +50 mA
Step 6 (Optional) Repeat Steps 3 through 5 for phase B (terminals D3 and D4) and phase C (terminals D5
and D6). To test independent ground input IG, gain access and transmit SL-51N=G,0 exit and save.
Apply test current to terminals D7 and D8, while monitoring OUT2 and repeat Step 4. Verify 51G
target ons the HMI.
