BE1-951
Testing and Maintenance
13-43
Table 13-59. 27X and 59X/159X Pickup Settings
Pickup Settings
Purpose
Undervoltage
Overvoltage
S0-27X=70,50ms
S0-59X/159X=90,50ms
Sets 27X PU at 70 V, 59X/159X at 90 V, TD
at min
S0-27X=60,50ms
S0-59X/159X=100, 50ms
Sets 27X PU at 60 V, 59X/159X at 100 V, TD
at min
S0-27X=50,50ms
S0-59X/159X=110, 50ms
Sets 27X PU at 50 V, 59X/159X at 110 V, TD
at min
Step 3 Prepare to monitor the 27X and 59X/159X function operation. Operation can be verified by
monitoring OUT1.
Step 4
Connect and apply a single-phase, 80 Vac voltage source to VX input, terminals C17 (polarity) and
C18 (non-polarity). Refer to Figure 13-1 for terminal locations.
Step 5 Slowly decrease the voltage until OUT1 closes. Pickup should occur 2 percent or 1 volt of
the pickup setting. Slowly increase the voltage until OUT1 opens. Dropout should occur between
102 and 103 percent of the actual pickup value. Verify the 27 bus target on the HMI and reset.
Step 6
Continue to increase the voltage until out1 closes. Pickup should occur 2 percent or 1 volt
of the pickup setting. Slowly reduce the
voltage until OUT1 opens. Dropout should occur
between 97 and 98 percent of the actual pickup value. Verify the 59 Bus target on the HMI.
Step 7
Verify the pickup and dropout accuracy of the middle and upper pickup settings listed in Table 13-
56.
Step 8 (Optional) Repeat Steps 2 through 7 for setting groups 1, 2, and 3.
Auxiliary Undervoltage and Overvoltage Timing Verification (fundamental Vx input)
Step 1 Using Table 13-60 as a guide, transmit the first row of setting commands to the relay.
Table 13-60. 27X, 59X/159X Pickup and Time Delay Settings
Pickup and Time Delay Settings
Purpose
Undervoltage
Overvoltage
S0-27X=50,2s
S0-59X/159X=110,2s
Sets 27X PU at 50 V, 59X/159X at 110 V
Sets 27X TD, 59X/159X TD at 2 seconds
S0-27X=,5s
S0-59X/159X=,5s
Sets 27X TD, 59X/159X TD at 5 seconds
S0-27X=,10s
S0-59X/159X=,10s
Sets 27X TD, 59X/159X TD at 10 seconds
Step 2 Prepare to monitor the 27X and 59X/159X timings. Timing accuracy is verified by measuring the
elapsed time between a sensing voltage change and OUT1 closing.
Step 3 Connect and apply a single-phase, 80 Vac voltage source to terminals C17 (polarity) and C18
(non-polarity). Refer to Figure 13-1 for terminal locations .
Step 4
Step the voltage down to 45 volts. Measure the time delay and verify the accuracy of the 27X time
delay setting. Timing accuracy is +5 percent or +3 cycles of the time delay setting.
Step 5 Step the voltage up to 115 volts. Measure the time delay and verify the accuracy of the 59X/159X
time delay setting. Timing accuracy is +5 percent or +3 cycles of the time delay setting.
Step 6 Repeat Steps 5 and 6 for the middle and upper time delay settings of Table 13-57.
Step 7 (Optional) Repeat Steps 2 through 6 for setting groups 1, 2, and 3.
