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2019-05-24 / V1.0
Contactors C137/C163/C164/C165 – Installation and Maintenance Instructions
Maintenance
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
X
Socket wrench set
X
Torque wrench
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
Refer also to section
“8.1 Safety”
on page 28
..
X
Disconnect the wires from the auxiliary contact.
X
Loosen the hexagon screw (1) a little that connects
the magnet yoke with the magnet core and screw
out a few millimeters. (Do not unscrew complete-
ly!)
X
Pull out the angled mounting bracket of the auxil-
iary contact assembly (2).
X
Slide the new auxiliary contact assembly (2) with
the angled mounting bracket underneath the
washer at the screw head (1).
X
Press the magnet yoke against the housing and
screw in the hexagon screw (1).
X
Adjust the angled mounting bracket of the auxil-
iary contact assembly (2).
-
The auxiliary contact must switch safely!
X
Thighten the hexagon screw (1) with a torque of
2 Nm.
X
Connect the wires to the new auxiliary contact,
see section
“7.2 Electrical Installation” /
.
“Connect
the auxiliary contact”
.
1
2
Fig. 38: Replace the auxiliary contact (the figure shows C137 C,
the procedure for C137 H is the same)
1
2
Fig. 39: Replace the auxiliary contact (the figure shows C163 C,
the procedure for C163 H, C164 C/H and C165 C/H is the
same)
Checks
After the maintenance work is completed, do the fol-
lowing checks:
X
Check the control connections.
X
Check the function of the auxiliary contact:
Use a continuity tester to check that the wiring
is correct and the auxiliary contact is functioning
correctly.
X
After each maintenance work, always perform
complete checks according to these standards:
-
IEC 60077-2
-
IEC 60947-4-1