Fronius 10.0-3 480, Руководство по обслуживанию, Страница: 164 / 180

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1 Measuring device
2 Inverter
9 Measuring line Example: Measuring the ground conductor resistance
(A) - release the on power stage set cover
- if necessary, the wall bracket must be lightly
scratched to penetrate the eloxal or powder coating
- The resistance must not exceed 0.3

*)
*) 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-
tor current Preparations
- 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.
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 method
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.
WARNING! An electric shock can be fatal. The inverter is live during the meas-
urement.