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Protect PV.500 Operating Instructions
34 of 70 80000031354 BAL
Sequence control behaviour differs depending on which solar cells
are connected.
The solar cells do not need to be earthed for operation with
monocrystalline or polycrystalline solar cells. In this case,
insulation measurement is always active.
For operation with thin-film solar cells, the solar cells have to be
earthed. In this case, insulation measurement is not active during
earthing.
Insulation measurement sequence control features a
"Maintenance mode". This mode can only be activated for thin-film
solar cells. Activating this mode removes earthing. This can be
useful when mowing areas where solar panels are installed, for
example.
5.3.2 Operation With Monocrystalline or Polycrystalline Solar Cells
General:
This type of solar cell does not require active earthing.
Sequence control:
Insulation monitoring is always active.
Maintenance mode:
No action in the event of a "maintenance mode" command.
Starting the insulation test manually:
No action, since the insulation test is always active.
5.3.3 Operation With Thin-Film Solar Cells
General:
This type of solar cell requires active earthing.
Active earthing is switched on during the day and switches off at
night. An insulation test is carried out at night.
When active earthing is switched on, the digital signals and
analogue signal from the isometer are ignored.
Once active earthing is switched off, a certain time is allowed to
elapse before the digital signals from the isometer are evaluated
and the analogue measured value is output.
Sequence control:
When the equipment sequence control switches to the "Night"
status (see chapter 5.1.6), the active earthing is switched off once
a certain time has elapsed.
The insulation test starts with a delay; after a certain test time the
insulation test is terminated and active earthing is switched back
on. If the sequence control switches to the "Operation" status
before the test time has elapsed, the timer control is ignored, the
insulation test is terminated and active earthing is switched back
on.
38


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