Fig. 18: Measuring Layout For Detecting Circulating Currents - REXROTH PSG Serie Betriebsanleitung

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Fig. 18: Measuring layout for detecting circulating currents

Apply measuring belt to the correct pole of the electrode gun and fix
1.
its position. The position of the current sensor has to be taken into
account (refer to the respective transformer circuit diagram). The fol­
lowing applies:
- Current sensor at positive pole:
- Current sensor at negative pole: apply measuring belt
Close electrode gun without a workpiece.
2.
Let weld current flow (in KSR mode).
3.
Measure and register weld current (i
Open electrode gun, insert workpiece and close gun.
4.
Also close all other guns which normally work at the same workpiece
simultaneously.
Current input as for 3.
5.
Let weld current flow again.
Measure and register weld current (i
If you obtain different current values, a circulating current in the range of
i = i - i is present.
c 2 1
Welding transformer
MPE
apply measuring belt
to negative pole
to positive pole
).
1
).
2
+
-
Weld cur­
A
rent meter
1st measurement
(without workpiece)
Bosch Rexroth AG
Assembly
+
Workpiece
-
A
2nd measurement
(with workpiece)
135