Technical information

– INTRODUCTION – – INFRANOR V ariable–Speed Drive –
21/04/95
01T00357
14
Page
3 – 3.Axis Module: Power Board
There are two types of power board:
–
boards with an IGBT power stage (1 hybrid power circuit, small
transformer) of varying design according to type: SMTB.Si or
SMTB.S.
–
boards with a bipolar stage (3 groups of 2 power transistors, lar ge
transformer),
a. Power board with IGBT POWER STAGE for
SMTB.Si:
Transfo.
connector
Position
B1 B1
B2
B3
Current Rating
8A
B1
B2
B1
Current loop
Fuse F1
Connector
Hybrid power circuit
B3 B2 B1
Fuse F2
L > 8.93 mH
12A
L > 5.95 mH
17A
L > 4.2 mH
30A
2.38 < L < 5.95
B1
45A
L > 3.97 mH
L = Inductance between phases of motor
Example of configuration for variable–speed drive
with 8 A rating :
B3 B2 B1