13-24
Testing and Maintenance
BE1-951
Step 5 Repeat Step 4 while monitoring OUT2 (150TN). Verify 50TG and 150TG targets on the HMI. Verify
the pickup accuracy of the middle and upper pickup settings.
Table 13-21. 50T/150T Element Accuracy
Pickup Accuracy
Sensing Type
A or B (1 A)
+2% or +10 mA
D, E, or F (5 A)
+2% or +50 mA
Step 6 (Optional) Repeat Steps 1 through 5 for the 50TN and 150TN elements in setting groups 1, 2, and
3.
50/150TN (Independent Ground Input IG) Time Delay Verification
Step 1 Prepare the 50TN and 150TN elements for testing by transmitting the commands in Table 13-19 to
the relay.
Step 2 Using Table 13-22, transmit the first column of setting commands for your sensing input type. (5A
Shown)
Table 13-22. 50/150TN Time Delay Settings
Pickup and Time Delay Settings
Purpose
2 Second TD
5 Second TD
10 Second TD
S0-50TN=0.5,2S,
S0-50TN=0.5,5S
S0-50TN=0.5,10S
Sets 50TN TD
S0-150TN=0.5,2S
S0-150TN=0.5,5S
S0-150TN=0.5,10S
Sets 150TN TD
Step 3 With the current source still connected to terminals D7 and D8 (IG), step the applied current to .55
amps (for 1 amp CT circuit divide by 5). Measure the time delay and verify the accuracy of the 50TN
time delay setting, OUT1, and 150TN, OUT2. Timing accuracy is +5 percent or +3 cycles of the time
delay setting.
Step 4 Repeat Step 2 and 3 for the middle and higher time delay settings in table 13-22.
Step 5 (Optional) Repeat Steps 1 through 4 for setting groups 1, 2, and 3.
Time Overcurrent (51)
Timing Verification
Purpose: To verify the timing operation of the 51 and 151 elements.
Reference Commands: SL-51PNQ/151N, S<g>-51P
Step 1 Prepare the 51 element for testing by transmitting the commands in Table 13-23 to the relay.
Table 13-23. Timing Test Commands
Command
Purpose
A=
Gain write access
SL-N=NONE
Zero out custom settings. Overwrite with
logic=none settings.
Y
Confirm overwrite
SL-N=PU51
Sets PU51 as custom logic name
SL-51P=1,0
Enables 51P, disables blocking
SL-51N=1,0
Enables 51N, disables blocking
