16
ABB
MAINTENANCE
ADVAC™ circuit breakers are designed for a minimum amount of maintenance. Circuit breakers in a clean,
non-corrosive environment require only annual inspection. Dusty or corrosive environments require inspection more
often at the discretion of the user. Inspection is required following each interrupted fault.
DO NOT work on an energized breaker.
DO NOT work on a breaker unless all components are disconnected by means of a visible break and securely
grounded.
DO NOT work on a breaker with power supplied to the secondary control circuit.
DO NOT defeat safety interlocks. This may result in bodily injury, death and/or equipment damage.
DO NOT work on a closed breaker.
DO NOT work on a breaker with a charged closing spring.
DO NOT use a circuit breaker by itself as the sole means of isolating a high voltage circuit.
DO NOT leave a breaker in an intermediate position in a cell. Always have the breaker in the disconnect, test or
connected position.
MECHANISM: (Refer to Fig. 4a & 4b)
The mechanism requires visual inspection of hardware, lubrication and operation during routine inspection.
Before beginning any maintenance, turn the Motor Disconnect Switch to OFF, discharge the Closing Springs by
pressing the Manual Close Button. Open the breaker by pushing the Manual Open Button. Press the Close and
Open buttons again to ensure the breaker is fully discharged. Verify springs are discharged by inspection of the
Spring Charge Indicator. Remove the front cover with a Phillips screwdriver. Correct any loose or missing hardware.
Always lubricate the working surface of the Cams (B) and the entire Motor Linkage Assembly (P). Verify lubrication
on latching surfaces located above the Charging Motor (D) in the mechanism (See Fig 4b). Remove any grease on
the breaker frame. Use Anderol 757 grease for lubrication (ABB No. 712994A, 4 oz. tube). If the grease becomes
caked and dirty, remove with a clean cloth and reapply lubrication.
Verify that the operation of the Manual Close and Open Push Buttons is free and smooth.
Replace the front cover before operation. Manually operate the mechanism a minimum of 2-5 operations to exercise
the mechanism.
MAINTENANCE
DANGER
High Speed Mechanical Parts. Serious injury may occur.
Keep hands and tools clear of the mechanism during opening and
closing operations and anytime the closing or opening springs are
charged. Before maintenance verify Closing Spring indicator
reads “Discharged”. Opening springs are always charged when
the circuit breaker is closed.
Courtesy of NationalSwitchgear.com
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