Ground Conductor Current - Fronius Symo 3.0-3-S Serviceanleitung

1 Measuring device
2 Inverter
9 Measuring line
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*) These requirements comply with DIN VDE 0701-0702 and ÖVE/ÖNORM E8701-1. Also
refer to the applicable requirements and standards in your country.
Ground conduc- Preparations
tor current -
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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:
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The measurement can be taken on the inverter (loop outside the device) or in the distribu-
tor. When taking the measurement in the distributor, ensure that there are no live conduc-
tors in the immediate vicinity and that no other consumers are connected to the same
circuit.
132
The resistance must not exceed 0.3  *)
Only perform the measurement if a ground conductor resistance test has been carried
out successfully
Direct method: The device must be isolated from earth. No other connections to the
earth potential are permitted (e.g. data cables, fitting, etc.)
Remove conductive objects from the housing
Fit any missing housing parts.
WARNING! An electric shock can be fatal. The inverter is live during the meas-
urement.
Direct method: Device must be completely isolated and must not exhibit any links to
another earth potential
Differential method
(A)
Example: measuring the ground conductor resistance
(A) - release on the power stage set cover
- Maybe you have to make a raw on the wall bracket,
that you get an electrical contact thru the oxide film or
powder coating of the wall bracket