Table of Contents
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9424200994 Rev U
Figure 298. BESTlogicPlus Settings (Vx Third Harmonic Mode)
Step 3:
Use BESTCOMSPlus to open the Protection, Voltage, Undervoltage (27X-1) screen and send
the first row of test settings in Table 157 to the BE1-11g.
Step 4:
Prepare to monitor the 27X-1 function operation. Operation can be verified by monitoring OUT2
(see Figure 298).
Step 5:
Connect and apply a single-phase, 120 Vac, 3
terminals C17 (polarity) and C18 (non-polarity).
Step 6:
Slowly decrease the voltage until OUT2 closes and record the pickup. Verify that there is a 27X-
1-3RD target on the front-panel display. Slowly increase the voltage until OUT2 opens and
record the reset. Reset the target.
Step 7:
Verify the pickup and reset accuracy at 70 Vac for a pickup setting of 65 V and 25 Vac for a
pickup setting of 25 V as listed in Table 157. Record the results.
Step 8:
(Optional.) Repeat steps 1 through 7 for the B-phase and C-phase voltage inputs.
Step 9:
(Optional.) Repeat steps 1 through 8 for settings group 1, 2, and 3.
Step 10: (Optional.) Repeat steps 1 through 9 for 27X-2, 27X-3, and 27X-4.
Timing Verification (Vx Third Harmonic Mode)
Step 1:
Use BESTCOMSPlus to open the Protection, Voltage, Undervoltage (27X-1) screen and send
the first row of test settings in Table 158 to the BE1-11g for settings group 0.
Step 2:
Prepare to monitor the 27X-1 timings. Timing accuracy is verified by measuring the elapsed
time between a sensing voltage change and OUT1 closing.
Step 3:
Connect and apply a 120 Vac, single-phase, 3
(polarity) and C18 (non-polarity).
Step 4:
Step the voltage down to 110 volts. Measure the time delay and record the result.
BE1-11g
Table 157. Pickup Test Settings (Vx Third Harmonic Mode)
Pickup Setting
115 V
65 V
20 V
Table 158. Timing Test Settings (Vx Third Harmonic Mode)
Pickup Setting
115 V
115 V
115 V
Time Delay
50 ms
50 ms
50 ms
rd
harmonic voltage source to the Vx input,
Time Delay
2,000 ms
5,000 ms
10,000 ms
rd
harmonic voltage source to terminals C17
Auxiliary Undervoltage (27X) Test
423
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Table of Contents
Troubleshooting
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