ACSD-36/80 Digital Brushless AC Servo Drive system - Ref.1609
Types of mains
Depending on the diagram of the electric energy distribution circuit, there are three
types of mains: TN, TT and IT. Depending on the type of mains, the cabling in the
electrical cabinet will vary considerably.
We here describe their characteristics and sample diagrams for a proper installation.
TN diagram
Distribution diagram that has a point directly connected to ground and the conductive
parts of the installation are connected to this point through ground protection conduc-
tors. This type of mains admits loads between one or several phases and the neuter.
There are three types of TN systems depending on the protection neuter and ground
combination:
TN-S diagram where the neuter and the ground protection conductors are separated
throughout the whole length of the system.
TN-C-S diagram where the neuter and the ground protection wire are combined in a
single conductor somewhere in the system.
TN-C diagram where the neuter and the ground protection functions are combined in
a single conductor throughout the system.
NOTE. A thermal switch may optionally replace the fuses.
NOTE. The secondary windings must have a star connection with its middle point con-
nected to ground.
NOTE. Note that the diagrams do not show the main contactor that must be connect-
ed between the transformer or auto-transformer and the ACSD unit!
WARNING. TN type mains are the only ones to which the ACSD system can
be connected either directly or through an auto-transformer.
F. 21 TN diagram.
FACTORY LINE
TRANSFORMER
DIFFERENTIAL
BREAKER
MAINS
FILTER
DIFFERENTIAL
BREAKER
MAINS
FILTER
DIFFERENTIAL
BREAKER
MAINS
FILTER
ACSD
ACSD
ACSD
L1
L2
L3
PEN
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