Fronius Symo 10.0-3-M Serviceanleitung, Ersatzteilliste Seite 177

WARNING!
An electric shock can be fatal.
The inverter is live during the measurement.
Once the inverter has been connected, switch it back on. The inverter must be feeding en-
ergy during the measurement to avoid unreliable results.
Only the leakage currents that occur at grid frequency may be included (50 - 60 Hz function
of ammeter). High-frequency leakage currents distort the measurement results *).
*) These requirements comply with DIN VDE 0701-0702 and ÖVE/ÖNORM E8701-1. Also
refer to the applicable requirements and standards in your country.
There are two methods that may be used to measure the ground conductor current:
- Direct method: Device must be completely isolated and must not exhibit any links to
another earth potential
- Differential current method
The measurement can be taken on the inverter (loop outside the device) or in the distribu-
tor. If taking the measurement in the distributor, ensure that there are no live conductors in
the immediate vicinity and that no other consumers are connected to the same circuit.
Direct method - Ground conductor current measured using ammeter on the ground con-
ductor
PE L1 N
mA
9 9
PE L1 N
1 Measuring device
2 Inverter
8 Isolated setup of test piece
9 Measuring line
Differential current method - Ground conductor current measured using an ammeter on
the N and L conductors
As with an FI switch, the currents between the outer conductor (L) and the neutral conduc-
tor (N) are compared using a converter. The difference is displayed.
1
9
Examples of measuring the ground conductor current
2
8
177