1070080029 / 05
Bosch Rexroth AG
Electric Drives
and Controls
PST 6xx0
|
|
210
/330
Information on this product
5.2.2
Functional principle of alternating current welding
The thyristor power unit integrated in the PST controls the AC welding
transformer with a bipolar, sinusoidal voltage with system frequency. In
order to influence the resulting %I in the secondary circuit, the ignition
time of the thyristors is influenced in the positive and negative half-cy
cle.
50/60 Hz
Timer
Thyristor
power unit
AC welding
transformer
Welding
equipment
PST 6xxx
U2
V2
U1
V1
Fig.2:
Block diagram overview: PST 6000 with transformer
100
0
120
-15
100
31
°
130
°
0
U
primary
t
Ignition time
Half cycle of the
mains voltage
Degrees electrical
Scale divisions
(SKT)
%I
Phase angle
%I is re
duced
%I is in
creased
Setting range for
programming
Setting range for
closed-loop controller
Operating principle of PST
corresponds
to low %I
corresponds
to high %I
Fig.3:
Influencing the %I in the secondary circuit by phase angle
ENGLISH
Summary of Contents for Rexroth PST 6 0 Series
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