Fronius Galvo 208-240 1.5-1 Serviceanleitung Seite 119

Direct process – Measurement of the ground conductor current with the injection probe
via the PE conductor.
PE L1 N
mA
9 9
GND PE L1 N
1 Measuring instrument
2 Inverters
8 Insulated assembly of the object being tested
9 Measurement leads
Differential current process – Measurement of the ground conductor current using injec-
tion probe via N and L leads.
As with a residual circuit breaker, the currents are compared between the phase conductor
(L) and the neutral conductor (N) via a transformer. The difference is displayed.
PE L1 N
9 9 9
GND
PE L1 N
1 Measuring instrument
2 Inverters
9 Measuring leads
When carrying out the measurement (direct or differential current process), the ground
conductor current must not exceed the limit value of 3.5 mA **).
**) These requirements relate to DIN VDE 0701-0702 and ÖVE/ÖNORM E8701-1. In ad-
dition, individual national requirements and standards must also be observed.
1
9
Examples for measuring the ground conductor current
2
8
mA
1
Examples for measuring the ground conductor current
2
119