9328900990 Rev L BE1-951 Testing and Maintenance 13-47
Table 13-69. Sync Check 25VM Live/Dead Dropout Time Settings
Sync Check VM Time Settings Purpose
S0-25VM=95,55,50ms,123,123 Sets LV = 95, DV = 55, TD = min, VM1 = 123, VM2 = 123.
S0-25VM=95,55,2S,123,123 Sets LV = 95, DV = 55, TD = 2 sec, VM1 = 123, VM2 = 123.
S0-25VM=95,55,5S,123,123 Sets LV = 95, DV = 55, TD = 5 sec, VM1 = 123, VM2 = 123.
Step 2: Prepare to monitor the 25VM Hot/Dead timing. Timing accuracy is verified by measuring the
elapsed time between a sensing voltage change and OUT1 opening.
Step 3: Connect relay Terminals C13 (A-phase), C14 (B-phase), and C15 (C-phase) together. Apply a
50 Vac, 50 or 60-hertz ac voltage source (Line VT Phase) to the three jumpered terminals and
the Neutral Terminal (C16).
Step 4: Step the voltage up to 60 volts. Measure the time delay and verify the accuracy of the dead
dropout time delay setting. Timing accuracy is ±0.5% or 1 cycle (minimum trip is affected by 3
cycle security count).
Step 5: Set the ac voltage at 100 volts. Step the voltage down to 90 volts. Measure the time delay and
verify the accuracy of the Live dropout delay setting. Timing accuracy is ±0.5% or 1 cycle
(minimum trip is affected by 3 cycle security count).
Step 6: Repeat Steps 5 and 6 for the middle and upper time delay settings of
Table 13-69.
Step 7: Connect a second single-phase 50 or 60-hertz voltage source (Auxiliary VX) to relay Terminals
C17 (polarity) and C18 (non-polarity). Repeat Steps 2 through 6.
Step 8: (Optional.) Repeat Steps 2 through 7 for Setting Groups 1, 2, and 3.
25VM1 and 25VM2 Output Test
Step 1: With no voltage applied to either the Line or Auxiliary voltage sources, OUT1 should be closed.
This verifies the DEAD-LINE, DEAD AUX output of 25VM1.
Step 2: Apply 0 volts ac to the Line Voltage Input (VT Phase). OUT1 contact should be closed. Output 1
will open as the voltage is increased above the DEAD-LINE setting and close again when
voltage exceeds the LIVE-LINE setting. This verifies the LIVE-LINE, DEAD-AUX output of
25VM1. Remove voltage source 1.
Step 3: Apply 0 volts ac to the Auxiliary Voltage Input (VX). OUT1 contact should be closed. Output 1
will open as the voltage is increased above the DEAD-LINE setting and close again when
voltage exceeds the LIVE-LINE setting. This verifies the DEAD-LINE, LIVE-AUX output of
25VM1.
Step 4: Transmit SL-VO1=25VM2 to the relay and save it. Repeat Steps 1 through 3 for 25VM2.
Step 5: (Optional.) Repeat Steps 1 through 4 for Setting Groups 1, 2, and 3.
25 Sync Check Verification
Step 1: Transmit SL-VO1=25 to the relay and save it.
Step 2: Using
Table 13-70 as a guide, transmit the setting commands to the relay.
Table 13-70. Sync Check Settings
Sync Check Settings Purpose
S0-25=10,10,0.3,0 Sets Delta V, angle, delta slip, and GF>BF mode.
Step 3: Prepare to monitor the 25 function operation. Operation can be verified by monitoring OUT 1.
Step 4: As in the previous test, connect relay Terminals C13 (A-phase), C14 (B-phase), and C15 (C-
phase) together. Apply a 120 vac, 50 or 60 hertz ac, 0 degree voltage source (Line VT Phase)
to the three jumpered terminals and the Neutral Terminal (C16).
Step 5: Apply a second 120 Vac, 50 or 60 hertz ac, 0 degree voltage source (Auxiliary VX) to C17 and
C18. OUT1 should close verifying the 25 output for a Delta Angle of 0 degrees, 0 Delta V and 0
Delta Frequency (Slip).
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