37
Troubleshooting
Problem Action to be taken
All unit types
Switch-disconnector cannot be closed. Check that switch-disconnector is in the “open” position
Turn the operating lever clockwise.
Switch-disconnector cannot be opened. Check that switch-disconnector is in the “closed” position.
Turn the operating lever counter-clockwise.
Switch-disconnector cannot be moved to the "earthed" position. Check that switch-disconnector is in the “open” position
Turn the operating lever clockwise.
Check that the operating lever is connected to the earthing shaft.
Switch-disconnector cannot be moved from the "open" to the "earthed"
position.
Check that switch-disconnector is in the “earthed” position.
Turn the operating lever counter-clockwise.
Check that the operating lever is connected to the earthing shaft.
Cable compartment door will not open or close. Check that switch-disconnector is in the “earthed” position.
Motor-operated switch-disconnector
Switch-disconnector cannot be closed or opened. Check that switch-disconnector is not in the “earthed” position.
Check that the auxiliary power supply is connected.
Combined switch-fuse unit
Combined switch-fuse unit will not close. Check to see whether a fuse has blown.
Check that the lever is not in the operating hole.
Check that the locking part is in the down position.
Combined switch-fuse unit is impossible to operate even
though a fuse has blown.
Check that the fuse has been correctly fitted with the trip pin indicator
pointing upwards.
Circuit-breaker unit
The cable compartment door will not open. Check that switch-disconnector is in the “earthed” position.
Remove the key from the circuit-breaker before opening or closing the door.
The circuit-breaker will not close. Make sure that the closing spring is fully loaded and that the interlocking coil
is not energized.
Check that the circuit-breaker key is in place and turned to the correct
operating position.
Check that the auxiliary voltage plug of the circuit-breaker is properly
plugged into its socket.
Instrument transformers
Secondary measurements from the current transformers are not possible. Check that all short-circuiting connections on the secondary terminals of the
current transformers have been removed.
Check the connections.
Table 19 - Troubleshooting
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