GE BUS1000 Instructions Manual page 31

5. HARDWARE DESCRIPTION
Operation level adjustment of the breaker failure unit (FIG. 11)
It is carried out by means of microswitches placed in the front part of the breaker failure board (SFI).
The minimum adjustment (all the microswitches placed at the left), is 0.2 A on the 1 A side, plus the number
corresponding to every microswitch located to the right. The unit adjustment ranges from 0.2 to 3.3 A on the 1
A side, in 0.1 steps.
Operation time adjustment of the breaker failure unit (FIG. 11)
It is carried out by means of microswitches placed in the front part of the breaker failure board (SFI).
The minimum adjustment (all the microswitches placed at the left) is 0.2 s, plus the number corresponding to
every microswitch, positioned to the right. The adjustment ranges from 0.1 to 1.6 s in 0.1 steps.
Operation level adjustment of the overcurrent unit (FIG. 11)
Two versions are available for the operation level of the overcurrent unit. In the first case, the level depends
on the level adjustment of the breaker failure unit, and in the second the level is totally independent.
Dependent adjustment:
It is done by means of microswitches placed in the front part of the breaker failure board (SFI).
The minimum adjustment (all the microswitches placed at the left) is 0.25 times the adjustment of the breaker
failure unit, plus the number corresponding to every microswitch, positioned to the right. The adjustment
ranges from 0.25 to 1 time, in 0.05 steps.
Independent adjustment:
The same as the operation level adjustment of the breaker failure unit.
Bus coupling timer adjustment
It is done by means of microswitches placed in the front part of the switching module (MDF).
The minimum adjustment (all the microswitches placed at the left) is 0.2 s, plus the number corresponding to
every microswitch, positioned to the right. The adjustment ranges from 0.2 to 1.7 s, in 0.1 steps.
Breaker failure trip signalling (FIG. 11)
It is done by means of a red LED placed in the front part of the boards, in every breaker failure unit.
This signalling is continuous and the reset is achieved manually through a push-button placed in the front
part of the board.
Operation signalling of the overcurrent unit (FIG. 11)
It is done by means of a red LED placed in the front part of the boards, in every breaker failure unit.
This signalling is not continuous and stops signalling when the unit is reset.
GEK-98514B BUS1000 Busbar Protection 5-7