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Functional principle
Welding current
1000 Hz
Frequency
f
1 ms
Figure 3: 1000 Hz welding
1070 080 067-101 (2001.03) GB
PSI 6XXX.350 L1
The PSI 6XXX.350 L1 is an open system timer. You can select control functions from a
variety of selections by entering or modifying the Basic Setup or the Welding Parameters.
You can configure your control by selecting various Basic Setup options and Program-
ming the Welding Parameters.
This means for you:
-
You need to set the parameters of a timer type only once and can
-
transfer these parameter settings to all your timers.
PSI
1000 Hz medium frequency
50/60 Hz
Timer
Figure 2: Basic functional diagram
The Bosch medium-frequency welding system uses DC current for welding. The duration
of the welding current is programmed in milliseconds (ms). Because welds turn out to be
more uniform than at 50 Hz, a higher output of correct welds is obtained.
The medium-frequency welding current is clocked at 1000 Hz. The constant-current reg-
ulation system is faster and more precise compared to 50 Hz welding.
Upon delivery, the PSI 6XXX.350L1 is set to primary current monitoring.
Inverter output voltage
U
t
3~
Transformer /
MF inverter
Rectifier
I
t
System
+
−
Welding
equipment
Welding current
t
1-3
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