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2021-06-09 / V1.0
Maintenance
Contactors CPP series – Installation and Maintenance Manual
8.3 Corrective maintenance
The contactors are largely maintenance-free. Therefore
there is no general requirement to replace parts during
its service life. Excepted from this are auxiliary switches
and the arc chamber:
Replacing the arc chamber
X
Remove the arc chamber. See section
“Removing
the arc chamber”
.
X
Insert the new arc chamber into the contactor
housing. See section
“Inserting the arc chamber”.
X
Make sure that the arch chamber is latched se-
curely.
Replacing the S870 auxiliary switches
Under normal working condition (there have been no
short circuits in the control circuit) the main switch
must be replaced after no more than one million actua-
tions in accordance with this manual.
However, in the event of a short circuit in the control
circuit, it is possible that an auxiliary switch is damaged
and must be replaced.
Tools required
-
Set of Torx bits or Torx screwdrivers
-
Torque spanner
Precondition
Only for built-in versions: The CPP contactor must be
removed from the base plate of the CP main contactor.
See section
“Installing the CPP contactor with 1,200 A
and 2,000 A CP devices”.
Procedure
To secure the auxiliary switch, use only the original plas-
tic-self-tapping screws 3 x 20, Torx drive (T10) – do not
use any screws with a standard/regular screw thread!
X
Pull off the receptacles of the control wires from
the auxiliary switches (2).
X
Using the Torx tool (T10) screw out the plastic-
self-tapping screws (1) and remove the auxiliary
switches.
X
Position the new auxiliary switches (2) on the
mounting so that the pin (3) on the contactor
housing slides into the second bore hole of the
auxiliary switch.
X
Lightly screw in the plastic-self-tapping screws (1).
X
Check that the auxiliary switches (2) are level on
the mounting and are not skewed.
X
Tighten the two plastic-self-tapping screws (1) to a
torque of 0.8 Nm.
X
Plug the receptacles of the control wires back on
to the contacts of the auxiliary switches (2).
2
1
3
0.8 Nm
Fig. 22: Replacing the auxiliary switches (stand-alone version)
2
1
3
0.8 Nm
Fig. 23: Replacing the auxiliary switches (built-in version)
