Ground Conductor Current - Fronius CL 44.4 Delta Serviceanleitung

Ground Conduc- Preparation
tor Current: -
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Once the inverter has been connected, it must be put back into operation. For the mea-
surement, the inverter must feed into the grid, since failure to do this will lead to an incorrect
measurement result.
Only the leakage currents which occur at grid frequency may be used (50–60 Hz function
of the current injection probe). High frequency leakage currents distort the measurement
results *).
*) These requirements relate to DIN VDE 0701-0702 and ÖVE/ÖNORM E8701-1. In addi-
tion, individual national requirements and standards must also be observed.
Two processes can be used for measuring the ground conductor current.
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Measurement can be carried out either at the inverter (loop inside or outside the device) or
in the distributor. When measuring in the distributor, ensure that there are no current-car-
rying conductors in the immediate vicinity.
Direct process – Measurement of the ground conductor current with the injection probe
via the PE conductor.
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WARNING! An electric shock can be fatal. Capacitors may become charged dur-
ing the insulation resistance measurement. After the measurement, a discharge
time of at least 5 minutes must be observed. Before continuing with the safety test
or removal of the adapter, the inverter must be tested for absence of voltage. The
potentials checked can be discharged with the insulation resistance measure-
ment instrument. Additional information on discharge time can be found in the op-
erating instructions or in the warning notices on the inverter.
Measurement should only be carried out once the insulation resistance test has been
passed.
The inverter must be insulated from ground. There must be no additional connections
to the ground potential (e.g. data leads, ground fuse, assembly, etc.). -> only for direct
processes.
Attach and connect the AC and DC leads to the inverter. Follow the safety instructions.
Remove conductive objects from the housing.
Fit missing housing parts.
WARNING! An electric shock can be fatal. During the measurement, there are
voltages at the inverter.
Direct process: Device must be insulated and may not be linked to another ground po-
tential.
Differential current process.
PE L1 N
mA
9 9 9
PE L1 N
1 Measuring instrument
2 Inverters
8 Insulated assembly of the object being tested
9 Measurement leads
1
2
8