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2021-02-10 / V1.0
Contactors C195 Series – Installation and Maintenance Instructions
Maintenance
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
8.2.2 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
Cables/busbars
Check for:
X
damaged cables, cable lugs
X
damaged insulation
X
corrosion
X
damaged busbars
X
kinked or crushed cables
X
loose or missing fastening elements
X
correct tightening torque of the terminal screw
In case of faults:
X
immediately replace damaged wires or
cable lugs
X
remove corrosion and replace cor-
roded parts
X
immediately replace damaged busbars
X
tighten loose fastening elements im-
mediately, replace missing fastening
elements
X
tighten the terminal screws to the
rated torque
Earth terminal
(only for C195 X/)
Check for:
X
damaged cable, cable lug
X
damaged insulation
X
kinked or crushed cable
X
loose or missing fastening elements
X
correct tightening torque of the earth terminal
nut
X
corrosion in the area of the earth connection
In case of faults:
X
immediately replace damaged wires or
cable lugs
X
tighten loose fastening elements im-
mediately, replace missing fastening
elements
X
tighten the earth terminal nut to the
rated torque
X
remove corrosion in the area of the
earth connection
Auxiliary switches
Check for:
X
dirt
X
damage or wear on the housing
X
signs of short circuits
The auxiliary switches can be accessed from the
outside for a simple visual inspection.
Under normal working condition (there have
been no short circuits in the control circuit) the
life time of the auxiliary switches exceeds those
of the contactor.
In case of faults:
X
replace the auxiliary switches, see section
“8.3.2 Replacing the auxiliary switches
– type C195 X/”
or
“8.4.2 Replacing the auxiliary
switches – type C195 A/, B/, S/, T/”
