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Protect PV.500-MH Operating Instructions
34 of 68 80000043212 BAL
The insulation resistance detected and the two signals are sent to
the equipment control. The insulation resistance is displayed as a
measured value. Signalling faults are generated from the two
isometer signals ( Chapter 6).
Sequence control behaviour differs depending on which solar cells
are connected. The solar cells do not need to be earthed for op-
eration with monocrystalline or polycrystalline solar cells. In this
case, insulation measurement is always active.
For operation with thin-film solar cells, the solar cells must be
earthed. In this case, insulation measurement is not active during
earthing.
Insulation measurement sequence control features a "Mainte-
nance mode". This mode can only be activated for thin-film solar
cells. Activating this mode disconnects earthing. This can be useful
when mowing areas where solar panels are installed, for example.