ABB UniGear 500R - Servicing

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9.3 Servicing
When, during an inspection as per paragraph (chapter
9.2), the need to carry out cleaning operations is
noted, proceed as follows:
 Where necessary, the work area must be
disconnected and locked against reconnection in
conformity with the safety standards specified in
the IEC directive and in the relative national
regulations.
 Clean the surfaces:
-Remove any dry dust deposits which are not very
adherent using a soft dry cloth.
-Remove any more adhering dirt with a low
alkaline detergent or with ETHANOL F 25 M.
 Clean the insulating surfaces and the conductive
components with ETHANOL F 25 M.
 After cleaning, rinse with clean water and dry
carefully.
 Should any partial discharges occur as a
consequence of the condensation phenomenon, a
temporary remedy which is often effective is
application of a thin layer of silicone over the
surface involved. For a permanent remedy to this
type of unusual problem, contact the ABB after-
sales assistance department.
9.3.1 Maintenance in busbar and cable comp.
9.3.1.1 Checking of the tightening main busbars
 Make the plant you want to work on safe (follow
the plant safety regulations).
 Remove the rear closing panels
-For IEC version: (Figure 113)
-For ENA version: remove the rear panels with the
flaps for gas evacuation (two upper flaps behind
the busbar compartment and three lower flaps
behind the circuitbreaker and feeder compartment)
(Figure 114). Take care to unscrew and remove
the panels which support the flaps, and not the
flaps themselves.
 Using a dynamometric spanner, check tightness of
all screws (see table) in paragraoh 6.3.
9.3.1.2 Visual inspection of the insulating materials
 Make the plant you want to work on safe (follow
the plant safety regulations).
 Remove the rear closing panels:
-For IEC version (Figure 113)
-For ENA version: remove the rear panels with the
flaps for gas evacuation (two upper flaps behind
the busbar compartment and three lower flaps
behind the circuitbreaker and feeder compartment)
(Figure 114). Take care to unscrew and remove
the panels which support the flaps, and not the
flaps themselves.
 Visually check that the disconnector monoblocks
are integral and do not show any breakages.
 If any, visually check that the insulating covering
of the main busbars and the insulating joining
covers of the busbars are integral and do not show
any breakages.
Figure 113: IEC version.
Figure 114: ENA version.