S&C Instruction Sheet 466-500 23
Troubleshooting
Unable to Close a VacuFuse II Interrupter
into its Mounting
If a VacuFuse II interrupter’s vacuum interrupter is in the
Open
position, the unit is dropped out, and it cannot be
successfully closed into the cutout mounting, then the
VacuFuse II interrupter has reached its
End-of-Life
state.
Remove the unit from its cutout mounting and return it to
S&C Electric Company for service.
In Mounting With Contacts Open
There are three scenarios in which a VacuFuse II inter-
rupter may remain in its cutout mounting with the vacuum
interrupter open:
1. The VacuFuse II interrupter does not have sufficient
voltage present in the cutout mounting to charge and
drop out. In this case, return of voltage to the cutout
mounting should cause the CHARGING LED to blink,
and the unit will drop open after approximately
45 seconds.
2. The VacuFuse II interrupter is stuck in the cutout
mounting and is powered. In this case, with sufficient
voltage the CHARGING LED will continue to blink. The
VacuFuse II interrupter will repeatedly attempt to drop
out while voltage is present. If it does not successfully
drop out within 3 hours, the unit will go into its
End-of-
Life
state.
To prevent premature end of life, use Loadbuster®—
The S&C Loadbreak Tool to operate the VacuFuse II
interrupter into the
Dropout
position. Refer to the
“Operation Using Loadbuster®—The S&C Loadbreak
Tool” section on page 19.
3. The VacuFuse II interrupter is stuck in the cutout
mounting and is in
Abnormal
mode. In this case, check
for voltage in the cutout mounting.
If sufficient voltage is present in the cutout mounting
and the CHARGING LED is not blinking, the unit is in
Abnormal
mode. Remove the VacuFuse II interrupter
from the cutout mounting following the steps in the
“Operation Using Loadbuster®—The S&C Loadbreak
Tool” section on page 19. Then, return the unit to S&C
Electric Company for service.
If there is insufficient voltage in the cutout mounting,
wait for power to be restored to the cutout mounting.
Then, test for the three scenarios described above.
Vacuum Interrupter Cannot Be Closed
If the VacuFuse II interrupter can be closed into the
cutout mounting and sufficient voltage is present in the
mounting—but the vacuum interrupter cannot be closed
through either of the two closing methods described in
the “Understanding the Closing Sequence” section on
page 10—then the VacuFuse II interrupter is in
Abnormal
mode. After removing the unit from the cutout mounting,
return it to S&C Electric Company for service.
