136
DMX
3
25. Basic trouble shooting
Situation Probability Solution
ACB does not close on pressing
“ON” button
Selector for dielectric test in
“dielectric test position”
Set the selector in “normal use”
position
U/V release is present but
not energized
Energize U/V release
Mechanism spring is not charged
Charge the mechanism spring
manually till a distinct sound
is heard & indicator turns yellow
Reset button ejected Press reset button
Racking Shutter is open Close Racking Shutter
Mechanical Interlock disables
closing
Re -check before attempting
to close the breaker
Racking shutter does not re-close
automatically after racking handle
is pulled out
Breaker is in-between
Service/Test/Isolated position.
Position indicator is not aligned
with any of the positions
Rack in or out the breaker
to any of the distinct positions
ACB cannot be pushed in to
isolated position
Breaker & Miss insertion device
ratings do not match
Put correct breaker
Racking Shutter does not open ACB is closed Keep on pushing the OFF button
ACB does not close electrically
Electrical antipumping is active Interrupt ‘OPEN’ command once
“Ready to close”(RTC) conditions
are not met
Check all RTC conditions
ACB trips after closing
Overload fault exists if tripping is
after several seconds or minutes.
Other fault(s) exist if tripping is
within a second
Check the unit protection and
identify the fault then clear
the cause
Shunt Release is getting
command continuously
Check the source of command
For a more detailed trouble shooting, consult the DMX
3
maintenance guide
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