Schaltbau CT1130/08 - Corrective Maintenance: Component Replacement

33
2019-03-06 / V1.0
Contactors CT/CU Series – Installation and Maintenance Instructions
Maintenance
Component Visual inspection Measures
Main contacts
(both xed and
movable contacts)
Check for:
X damage or wear and tear
It requires some experience to evaluate the state
of the contacts. Even after only a few switchings
under load the contacts look used and “polluted”
for the inexperienced eye. Contacts need only to
be replaced if the wear of the contact tips is more
than 70%.
In case of faults:
X replace contacts if the wear of the
contact tips is more than 70%,
refer to section „10.3 Corrective
maintenance“ / „Replace the main
contacts and the ceramic protection
insert“
Auxiliary switches Check for:
X damage or wear and tear
The auxiliary switches are visible for a simple
optical inspection from the outside (housings are
clean and do not show signs of short-circuits etc.).
Under normal working conditions (no short cir-
cuit switching) the life time of the auxiliary swit-
ches exceeds those of the contactors.
In case of faults:
X replace auxiliary switches,
refer to section „10.3 Corrective
maintenance“ / „Replace the auxilia-
ry switches“
10.3 Corrective maintenance
The contactors are maintenance-free. There is therefore
no general provision for replacing components during
its service life.
However, in case of permanent heavy load switchings,
failures, short-circuit switchings or in similar cases cor-
rective maintenance may be necessary.
Replace the main contacts and the
ceramic protection insert
If the main contacts need to be replaced, allways re-
place all 4 contacts (the moving bridge and the 2 xed
contacts).
Required tools and auxiliaries
- Socket wrench set
- Hexagon socket wrench set
- Set of torx bits
- Set of slotted screwdrivers
- Torque wrench
- Locking varnisch (red)
- Sharp knife, cutter knife
Preconditions
- The main cables/busbars are removed.
- The protection cap of the auxiliary switches is re-
moved (except for contactor types with plug and
socket connectors)
- The protection cap of the coil terminal is removed.
- The upper module is removed.
- The earthing cable is disconnected.
- The wires of the auxiliary switches are disconnected
(except for contactor types with plug and socket
connectors).
- The coil control wires are disconnected.
- The lower module is dismounted from the mounting
frame or plate.
For detailed instructions about the above listed precon-
ditions refer to section “9. Installation”.
Replace the moving bridge (single pole contactors)
Depending on the contactor type, see Fig. 43 to Fig. 44.
X Remove the self-locking nut (M8 x 1.25) including
washer (1) at the bottom of the lower module us-
ing a 13 mm socket wrench.
The self-locking nut (1) is secured with red
locking varnish which will be destroyed
during that operation.
X Keep the self-locking nut and washer (1) in a safe
place.
X Pull the moving bridge (2) out of the guidance.
1
2
Fig. 43: CT/CU 1115/04, 1130/04, 1115/08, 1130/08:
Replace the moving bridge