7 Acceptance/Protection Function Test Guide
D02706R02.30
L-PRO 4000 User Manual
7-51
Sync Check Test Procedure
1. In Relay Control Panel access relay
Metering>Protection.
Monitor:
25/27/59 Sync Check
Output Contact: 10
Observe 25/27/59 Sync Check = High (Proves DMDA with no voltage
applied)
2. Apply voltages to the relay main voltage input terminals sufficient to create
Vpos of 66.4 V.
If only 3 voltage sources are available:
Ph A: 330, 99.6 V
0
Ph B: 331, 99.6 V
-120
Ph C: 332, not applicable
Ph N: 333
OR
If 4 voltage sources are available:
Ph A: 330, 66.4 V
0
Ph B: 331, 66.4 V
-120
Ph C: 332, 66.4 V
+120
Ph N: 333
Observe 25/27/59 Sync Check = High (Proves Live Main Dead Aux (LM-
DA) with only line voltage applied)
3. Turn voltage off.
4. Apply single-phase nominal voltage (120 V) to the relay auxiliary voltage
input terminals.
Ph A:324, 120 V
25
(Note: 3x Minimum Voltage = 3x40 =120 V
this is for single-phase only)
Ph N: 327
(Short and ground unused Terminals 325 and 326)
Observe 25/27/59 Sync Check = High (Proves DMLA with only bus-
voltage applied)
5. Apply both sets of voltages to main and auxiliary inputs as detailed above.
Observe:
25/27/59 Sync Check = Low
6. Simultaneously rotate the auxiliary voltage phase angle in lagging direction
(i.e. toward 0
).
At 21
to 19
difference (expect 20
):
25/27/59 = High
Contact 10 = Closed (after 200 ms)
7. Slowly ramp down the auxiliary voltage magnitude.
At 41.0 to 39.0 V (expect 40 V):
25/27/59 = Low
Summary of Contents for L-PRO 4000
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