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2019-08-07 / V1.0
Contactors C193/C294 – Installation and Maintenance Instructions
Maintenance
Regular check activities
All of the maintenance activities that may be carried out
on the contactors by skilled personnel are listed below.
Component
Visual inspection
Measures
Cables/busbars
Check for:
X
broken cables, cable lugs
X
damaged insulation
X
kinks or crushing points
X
damaged busbars
X
loose or missing fastening elements
X
correct tightening torque of the terminal screws
In case of faults:
X
immediately replace damaged cables
or cable lugs
X
immediately replace damaged bus-
bars
X
thighten loose fastening elements
immediately replace missing fasten-
ing elements
X
thighten the terminal screws with
the rated torque
Contactor housing
Check for:
X
dirt
X
damage or wear and tear
X
penetrations, holes in the contactor housing wall
X
loose or missing fastening elements
In case of faults:
X
remove existent dirt
X
if the contactor housing is damaged
or heavily worn replace the entire
contactor
X
in case of penetrations, holes in the
contactor housing wall replace the
entire contactor
X
thighten loose fastening elements
and immediately replace missing fas-
tening elements
X
thighten a loose contactor housing
Auxiliary contact
Check for:
X
dirt
X
damage or wear and tear
X
signs of short circuits
The auxiliary contact is visible for a simple optical
inspection from the outside.
Under normal working conditions (if there were
no short circuits in the control circuit) the life
time of the auxiliary contact exceeds those of the
contactors.
In case of faults:
X
replace auxiliary contact, refer to
section
“8.3 Corrective maintenance”/
“Replace the auxiliary contact”.
