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Protect PV.500 Operating Instructions
80000031354 BAL 35 of 70
Maintenance mode:
Maintenance mode can be triggered either via a command or by
means of remote signalling. Active earthing switches off
immediately 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 maintenance mode for at least a certain time; i.e. even
if the unit is switched over to the "Operation" status, 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 when the insulation test is started
and the test actually commences once a delay has elapsed. When
the test period has elapsed the insulation test finishes and the
active earthing is switched on again.
The insulation test can only be started manually if an insulation
test is not already running at the time.
5.3.4 Insulation Monitoring in Compain Operation
In compain operation (see chapter 5.5), both inverters are fitted
with the isometer.
Insulation measurement in single operation
In single operation, the two inverters behave like two individual
units. Insulation measurement is active in both inverters.
Insulation measurement in linked operation
In linked operation, the inverters are connected on the DC voltage
side. If both inverter isometers were to be active in this operating
mode, this would distort the measurement of the insulation
resistance. Therefore, in linked operation, the isometer of the
inactive inverter is switched off and its sensors are disconnected
from the DC voltage. Now only one isometer is active and the
measurement of the insulation resistance is correct.
5.3.5 Insulation Monitoring Parameters
All parameters are only relevant for operation with thin-film solar
cells.
Insulation test time:
The analogue and digital signals from the isometer are evaluated
during this time.
Delay for insulation test following shutdown of K21 (earthing
of PV cells):
Once the earthing has been disconnected, this time must elapse
before insulation measurement can start.
Delay for shutdown of K21 in night operation:
Once sequence control has switched to the "Night" status, this
time must elapse before earthing is removed with contactor K21.
Minimum time in maintenance mode:
If maintenance mode has been activated, the earthing is
disconnected and remains so for at least this time.
39


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