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Protect PV.250 Operating Instructions
Page 17 of 51 80000027023 BAL, en
4.3.2 Operation With Monocrystalline or Polycrystalline 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.
4.3.3 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 whilst the earthing is
switched off.
When active earthing is switched on, the digital signals and ana-
logue signal from the Bender 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 Protect PV.250 sequence control switches to the "Night"
status (see Chapter 4.1.6), 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 be-
fore the test time has elapsed, the timer control is ignored, the in-
sulation test is terminated and active earthing is switched back on.
Maintenance mode:
Maintenance mode can be triggered either via a command or by
means of remote signalling. Active earthing switches off immedi-
ately when maintenance mode is activated. However, the digital
and analogue signals from the isometer continue to be ignored.
Active earthing is switched on again the next time a switch is made
to the "Operation" status. However, the unit remains in mainte-
nance mode for at least a certain time; i.e. even on a change of
status to "Operation", maintenance mode is not terminated until
this time has elapsed.
Starting the insulation test manually:
The insulation test can be started manually for maintenance work.
Active earthing is switched off after the start of the insulation test
and the insulation test starts once a delay has elapsed. When the
test period has elapsed the insulation test finishes and the active
earthing is switched on again.
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