ABB Uniswitch - Troubleshooting

ABB 52
Uniswitch Operation and
Maintenance Manual
UNIS14GB 05-02
6 Troubleshooting
Problem Action
All cubicle types
Switch-disconnector cannot be closed.
• Check that the switch is in the open position.
• Check that the interlocking selector is in the
‘Operation’ position.
• Turn the operating handle clockwise.
Switch-disconnector cannot be opened.
• Check that the switch is in the closed position.
• Check that the interlocking selector is in the
‘Operation’ position.
• Turn the operating handle anti-clockwise.
Switch-disconnector cannot be moved to
the earthed position.
• Check that the switch is in the open position.
• Check that the interlocking selector is in the ‘Test’
position.
• Turn the operating handle clockwise.
Switch-disconnector cannot be moved
from the open to earthed position.
• Check that the switch is in the earthed position.
• Check that the interlocking selector is in the ‘Test’
position.
• Turn the operating handle clockwise.
Cable compartment door will not open or
close.
• Check that the switch is in the earthed position.
• Check that the interlocking selector is in the ‘Door
open’ position.
Motor operated switch-disconnector
Switch-disconnector will not close or
open.
• Check that the switch is not in the earthed position.
• Check that the interlocking selector is in the
‘Operation’ position.
• Check that the auxiliary power supply is connected.
Switch-fuse cubicle
Switch-fuse will not close. If the switch is in the open position due to a fuse trip or
motor operation, the notch on the operating shaft is to be
turned downwards before the switch can be operated to
the closed position.
Check to see if a fuse has blown.