Parker Hannifin S.p.A. - Divisione S.B.C. LVD User’s Manual
19
Autotransformer
MAINS
L1
L2
L3
PE
1
2
3
4
5
6
A
B
C
D
MOTOR
E
M
X9
Stud
1
5
6
9
a
b
f
e
d
c
g
connector
resolver
X10
1
2
3
X8
Power Supply
24 V = 1.5A
3.15A
*
*
Only if the Power Supply output
is unprotected
emc
filter
Earthing Bar
Note:
The EMC filter can be connected up- or down-line of the
autotransformer;
if connected up-line, it may prove necessary to use a screened cable
between autotransformer and LVD; if connected down-line, the cable
between filter and LVD must be as short as possible and, in any
event, no longer than 50 cm.
Use the following formula when sizing the system:
(
)
Pt
Paz
n
=
⋅
+
⋅
+
1 7
80
173
2
.
.
where:
Pt
is transformer power in VA;
Paz
is the sum of motor rated power in W;
n
is the
number of drives to be powered.