System description
9
3.3 Functional description
The VG12 safety distributor provides a protective measure which
meets the legal provisions
is practice-oriented
does not hinder the work with the power generator
can be mounted quickly, simply and cost-effectively (plug connection)
can be connected to the interior of the power generator without any intervention
does not require maintenance.
The VG12 safety distributor has a compact plastic enclosure made of impact-resistant
material. The Schuko socket-outlets are integrated in this enclosure. The loads are sup-
plied exclusively via this socket-outlet after mounting and commissioning. A cable con-
nects the VG12 safety distributor to the power generator.
The VG12 safety distributor contains an insulation monitoring device in accordance
with EN 61557-8. It is an actively measuring ISOMETER® type IR423 which superimposes
a measuring voltage onto the system.
When the power generator is running, this device constantly monitors the insulation
condition of the power generator system against the equipotential bonding. If the in-
sulation resistance falls below 23 kΩ, the ISOMETER® triggers and disconnects the so-
cket-outlets from the main voltage via a relay within one second. At the same time, the
LEDs "AL1", "AL2" on the insulation monitoring device indicate the change in the insu-
lation resistance.
The disconnection and the indication via the LEDs "AL1", "AL2" can be reset via the com-
bined test/reset button "T/R" if the insulation fault is at least 25 % above the response
value of 23 kΩ.
