Functional Principle Of Medium-Frequency Welding; Fig. 3:Block Diagram Overview: Prc7000 With Transformer; Fig. 4:Detailed Block Diagram Of A Welding System With Prc7000 - Bosch Rexroth PRC 7000 Betriebsanleitung

R911172834 / 02 | PRC7000
5.2.2

Functional principle of medium-frequency welding

Mains
50/60 Hz
L1
L2
L3

Fig. 4:Detailed block diagram of a welding system with PRC7000

PRC7000
Weld timer

Fig. 3:Block diagram overview: PRC7000 with transformer

The MF inverter integrated in the PRC7000 controls the welding trans­
former by a bipolar, rectangular voltage with a frequency of 1000 Hz. In
order to influence the resulting heat in the secondary circuit, the pulse
width is adjusted (refer to Fig. on following page).
Secondary rectification of the weld current is performed in the PSG.
6-pole bridge
rectifier
L1
L2
L3
Driver
Power
Controller
supply
to temperature
Weld timer
to constant-current
regulation in the
Secondary vol­
tage tapping
*: depending on trans­
3~
1000
Hz
MF inverter
Direct current link circuit
Transistorized transformer-rectifier
U
U
monitoring
*
PRC7000
*
former design
to electrode gun
Bosch Rexroth AG 211 / 334
Information on this product
PSG
+
-
Transformer-
Welding
rectifier
equipment
PRC7000
V
V
Welding
transformer
PSG
Rectifier