Specifications

IN - 10 Installation Ver. 0002
IN.3.1.3 TRANSFORMER OR AUTOTRANSFORMER.
If the Mains voltage has to be adapted to the system levels, an isolating transformer or
autotransformer must be used. This element will help reduce the mains harmonics, although it
does not assure compliance with the CE directive.
When having a mains perfectly referenced to ground, autotransformers
may be used to adapt to the mains voltages.
However, when having a mains not referenced to ground, an isolating
transformer must be used because dangerous overvoltage could appear
on some phases with respect to ground which could damage the
equipment. In this case, the secondary must have a star connection with
its middle point connected to ground to the mains neuter line.
On systems with XPS power supplies, the transformer must have a very
low impedance which could be negligeable as compared to the inductive
value of the CHOKE XPS-xx.
IN.3.1.4 LINE INDUCTANCE
Line Inductance means including chokes on each of the three power lines. Its function is to
reduce the harmonics generated in mains. The recommended value is given by the formula
below. To simplify the choice, we could consider optimum the values given in the table.
If the "Power Pro" filter has not been installed, the Line Inductance is recommended in order to
minimize disturbances, although is warned that this does not guarantee CE marking
compliance.
No Line Inductances must be installed in line with XPS power supplies
since they would interfere with their regenerating function.
L
V
fIrms
=
⋅
⋅
004
2
.
π
PS-25A
PS-25B
PS-65A
ACD/SCD
1.08/15
ACD/SCD
1.25
ACD/SCD
2.50
ACD/SCD
2.75
L (mHr)
10.4 5 3 1.5 1
I rms (A)
40 100 11 18 36 53