149
EN
Direct method
- Ground conductor current measured using ammeter on the ground con-
ductor
The sum of the currents flowing to the ground conductor through the device insulation or
caused by the circuits in the device is displayed.
1 Measuring device
2 Inverter
8 Isolated setup of test piece
9 Measuring line
Examples of measuring the ground conductor current
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 Measuring device
2 Inverter
9 Measuring line
Examples of measuring the ground conductor current
NOTE!
The inverter leakage current for the Fronius Primo can be as high as 5 mA
due to the topology:
-
The Fronius Primo is a transformerless inverter. The leakage current meas-
urement also includes leakage currents unintentionally measured through
the solar modules.
-
To determine the maximum leakage current of the Fronius Primo, the leak-
age currents of the solar modules must be calculated and deducted from the
measured value.
(For instructions on how to calculate the leakage current of the solar mod-
ules, see DOCUMENT Transformerless calculation).
PE
mA
L1
1
2
9
9
9
N
PE
L1
N
8
PE
L1
1
2
9
9
9
N
PE
L1
N
mA
Summary of Contents for Primo 3.0-1
Page 2: ...2 ...
Page 5: ...Allgemeine Informationen ...
Page 6: ......
Page 13: ...Fehler Suchhilfe ...
Page 14: ......
Page 32: ...32 ...
Page 33: ...Komponenten austauschen ...
Page 34: ......
Page 54: ...54 DC Trenner auf ON stellen 6 ...
Page 65: ...Sicherheitstechnische Überprüfung ...
Page 66: ......
Page 78: ...78 ...
Page 81: ...General information ...
Page 82: ......
Page 89: ...Error location aid ...
Page 90: ......
Page 108: ...108 ...
Page 109: ...Changing components ...
Page 110: ......
Page 130: ...130 Set the DC disconnector to ON 6 ...
Page 141: ...Safety Inspections ...
Page 142: ......
Page 154: ...154 ...
Page 155: ...Appendix ...
Page 158: ...158 ...
Page 159: ...159 ...