20
2021-04-12 / V1.1
Installation
Contactors CP Series – Installation and Maintenance Instructions
8.4 Electrical Installation
The electrical data for the control power of the mag-
netic drive and for the auxiliary switches as well as fur-
ther technical parameters can be taken from the corre-
sponding data sheets or from our catalogue C40.
The catalogue is available under:
https://www.schaltbau.com/en/media-library/
8.4.1 Preparatory measures
X
The minimum clearances to live and earthed parts
are given in the corresponding data sheets or in
our C40 catalogue and must be adhered to.
The catalogue is available under:
https://www.schaltbau.com/en/media-library/
X
Switching of high voltage currents produces elec-
tric arcs and it is possible that plasma will escape
from the openings of the arcing chambers. There-
fore, it is extremely important to maintain the min-
imum clearances to live and earthed parts to avoid
ashovers. These minimum clearances have been
tested and specied in relation to the switching
capacity of the contactors.
X
For switching heavy loads allow a minimum time
of 30 s between switchings. Allow a recovery time
of at least 10 min after 3 heavy load switchings in
succession.
X
The earth connecting cable must be tted with an
appropriate ring terminal (for M8 terminal screw).
X
Undersized conductor cross-sections for the earth
connection may produce a safety hazard.
X
The minimum conductor cross-sections for the
main terminal connection and the earth connec-
tion must be observed.
X
Schaltbau recommends busbars for the connec-
tion of the main terminals. The required cross-
sections of the busbars depend on the application
and must be determined by the plant operator.
X
If connecting cables are used for the main power
circuit, they must be selected taking into consid-
eration the insulation class and the ambient con-
ditions.
X
The connecting cables of the main power circuit
must be tted with appropriate ring terminals (for
M12 terminal screws).
- Schaltbau recommends using Schnorr washers
(or similar).
X
The main terminal screws must be tightened to a
torque of max. 30 Nm.
X
The auxiliary switches are provided with screw
terminals (M3). The control wires for the auxiliary
switches must be stripped accordingly (if neces-
sary, t with appropriate wire end sleeves).
X
The maximum permissible conductor cross-
section of the auxiliary contact control wires is
1mm
2
/ AWG 18 stranded wire.
X
The coil control connection is provided with a ter-
minal strip with cage clamp terminals. The control
wires for the coil connection must be stripped ac-
cordingly (if necessary, t with appropriate wire
end sleeves).
X
For the power consumption of the magnetic drive
system and the electrical data of the auxiliary
switches refer to our catalogues:
- C40 (Catalogue CP series devices)
- D26 (Catalogue auxiliary switches S826)
- D70 (Catalogue auxiliary switches S870)
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