• If a ground fault is present, determine the location of the ground fault via the ratio of the
two measured voltages and eliminate the ground fault.
Example: Location of the ground fault
The example shows a ground fault between the second and third PV module.
3. If a definite ground fault cannot be measured and the message is still displayed, measure the
insulation resistance.
4. Reconnect the strings without ground faults to the inverter and recommission the inverter.
Test by Measuring the Insulation Resistance
If the voltage measurement does not provide sufficient evidence of a ground fault, the insulation
resistance measurement can provide more exact results.
Figure 1: Schematic diagram of the measurement
5 Checking the PV System for Ground Faults
SMA Solar Technology AG
Service Manual for Installers
19
STP5-12TL-20-SG-en-13
Summary of Contents for SUNNY TRIPOWER 10000TL
Page 37: ...www renews pro...
