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2019-08-07 / V1.0
Maintenance
Contactors C193/C294 – Installation and Maintenance Instructions
8.3 Corrective maintenance
The contactors are maintenance-free. Therfore there is
no general provision for replacing components during
its service life.
Replace the auxiliary contact
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.
However, in case of a short circuit in the control circuit
it can happen that an auxiliary contact has been dam-
aged and must be replaced.
Required tools
-
Socket wrench set, hexagon nuts
-
Torque wrench
-
Continuity tester
-
Cable ties
Procedure
DANGER
Before removing the auxiliary contact
make sure that
X
there is no voltage present,
X
all safety regulations are fully ob-
served.
X
Striktly observe section
“8.1 Safe-
ty”
on
page 22
.
X
Disconnect the wires from the auxiliary contact, if
necessary.
X
Loosen the self-locking nut (1) and remove it to-
gether with the washer.
X
Remove the auxiliary contact (2) and the screw (3)
from the housing.
X
Insert the new screw (3) in the housing.
X
Push the new auxilary contact (2) on the screw (3)
in a way so that the locking pin (4) on the housing
slides into the second bore hole of the auxiliary
contact.
X
Screw on the auxiliary contact using the new self-
locking nut (1) and washer.
X
Adjust the auxiliary contact (2) slightly if necessary.
-
The auxiliary contact must switch safely!
X
Thighten the self-locking nut (1) with a torque of
0.5 Nm max.
X
Connect the wires to the new auxiliary contact,
see section
“7.2 Electrical installation”/“Connect
the auxiliary contact”.
X
Check that the control wires are properly connect-
ed to the auxiliary switch.
X
Use a continuity tester to check that the wiring is
correct and the auxiliary switch is functioning cor-
rectly.
X
Bundle the control wires with cable ties and fix
them to the grommet (5) provided for this pur-
pose.
1
2
max. 0.5 Nm
4
3
5
Fig. 17: C193 series: Replace the auxiliary contact
1
2
max. 0.5 Nm
4
3
5
Fig. 18: C294 series: Replace the auxiliary contact
