GE BUS1000, Instructions Manual

Page: 42 / 129

7. ACCEPTANCE TESTS
7-6 BUS1000 Busbar Protection GEK-98514B
7.7. DIFFERENTIAL TRIPPING OUTPUT CONTACTS TEST
This test has to be repeated for all positions and both bus bars.
Check that the contacts (see table 3: Differential output contacts and table 4: lock out contacts) are open.
Connect the latching corresponding to bus bar A of the feeder being, simulating this situation in terminal
blocks applying dc (+) to the corresponding terminal tested, see table 2: Bar connection & disconnection).
Check that the lock out contact is closed (see table 4: lock out contacts).
Connect the corresponding bus bar differential. Put the corresponding jumper between terminals U1-U2 for
Bar A and U3-U4 for Bar B. Apply 1,2 Amp to terminals (see table 1: Input current)
Check that when the differential trips, contacts (see table 3: Differential output contacts) are closed and the
lock out contact is open (see table 4: lock out contacts).
NOTE: When the alarm starts, it will disconnect the tripping contacts but the lock out contacts will remain
closed until they are reset (see drawing 226B6429H28):
•
Pushing the button located in the BPP module (see cabinet front view 226B6430F15)
•
Using an external contact connected between X23-X24.
Check that when the blocking differential A, using its blocking unit (pushing the OFF button of the test block),
and applying the previous current, the above mentioned contacts do not close.
Disconnect the latching corresponding to bus bar A, and connect the latching of bus bar B (this can be
simulated in terminal blocks applying dc (+) to the corresponding terminals, see table 2: Bar connection and
disconnection), and repeat the process.
Repeat the same procedure for phase 2 and for phase 3 (see table 1: Input current).
Repeat the same procedure for bus bar B, for each phase.
TABLE 1: input current for all positions
Phase A Phase B Phase C
23-26 24-26 25-26
TABLE 2: Bar connection and disconnection for all positions
BAR A BAR B
ON OFF ON OFF
12 13 14 15
TABLE 3: DIFFERENTIAL TRIPPING OUTPUT CONTACTS
CONTACTS
1-2,3-4
TABLE 4: LOCK OUT CONTACTS
CONTACTS
5-6