7 Acceptance/Protection Function Test Guide
D02706R02.30
L-PRO 4000 User Manual
7-33
27
Undervoltage
Test
Settings
• Main: AND (3-Phase Undervoltage)
• Auxiliary: AND (Single-Phase Undervoltage; Only 1 phase is connected)
• Main and Aux Pickup: 30 V
• Time Delay: 0.01 second
Figure 7.23: Undervoltage Logic (27)
27 Test Procedure
1. In Relay Control Panel access relay
Metering>Protection.
Monitor:
27 Main U/V
27 Aux U/V
Monitor Output Contacts:
13 (27 Aux Trip)
14 (27 Main Trip)
2. Apply balanced 3-phase nominal voltages (66.4 V) to the relay terminals.
Ph A: 324 and 330, 66.4 V
0
Ph B: 331, 66.4 V
-120
Ph C: 332, 66.4 V
+120
Ph N: 327 and 333
Observe:
27 Main U/V = Low
27 Aux U/V = Low
3. Reduce A Phase voltage.
At 31.0 to 29.0 V (expect 30 V):
27 Aux U/V = High
Contact 13 closed
27 Main U/V remains Low
Contact 14 open
4. With A Phase voltage still reduced, reduce B and C phase V:
27 Aux Undervoltage
1 Phase Connected
T
0
T
0
300
301
302
303
27 Va aux RMS
27 Vb aux RMS
27 Vc aux RMS
27 Vb main RMS
27 Vc main RMS
27 Main Undervoltage
3 Phases Connected
Out 14
Out 13
27 Va main RMS
Summary of Contents for L-PRO 4000
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