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2021-06-09 / V1.0
Maintenance
Contactors CPP series – Installation and Maintenance Manual
ATTENTION
Detent-edged rings and detent-edged washers have
a limited life time. After screws secured with detent-
edged rings or detent-edged washers have been
undone three times, the rings or washers must be
replaced by new ones.
X
Record the frequency of undoing of the screws
in the work log.
X
Replace detent-edged rings or detent-edged
washers with new ones after the screws have
been undone three times.
Regular tests/checks
All of the maintenance activities that may be carried out
on the contactors by skilled personnel are listed below.
Component
Tests/checks
Measures
Wires/busbars
Check for:
X
damaged wires, cable lugs
X
damaged insulation
X
corrosion
X
damaged busbars
X
kinked or crushed wires
X
loose or missing fastening elements
X
correct tightening torque of the terminal screws
In case of faults:
X
immediately replace damaged wires
or cable lugs
X
immediately replace damaged bus-
bars
X
remove corrosion and replace cor-
roded parts
X
tighten loose fastening elements im-
mediately replace missing fastening
elements
X
tighten the terminal screws to the
rated torque
Earthing cable
(only for stand-alone
versions)
Check for:
X
damaged cable, cable lug
X
damaged insulation
X
corrosion
X
kinked or crushed cable
X
loose or missing fastening elements
X
correct tightening torque of the earthing terminal
screw
In case of faults:
X
immediately replace a damaged ca-
ble or cable lug
X
remove corrosion and replace cor-
roded parts
X
tighten loose fastening elements im-
mediately replace missing fastening
elements
X
tighten the earthing terminal screw
to the rated torque
Base plate/mounting
flange
Check for:
X
loose or missing fastening elements
In case of faults:
X
tighten loose fastening elements im-
mediately
X
replace missing fastening elements
X
tighten a loose contactor immedi-
ately
