2 Safety precautions
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2.3 Basic safety measures
Electrical work on the Solar Inverter must be con-
ducted by a qualified electrician while observing the
VDE regulations, national and other regulations.
The Solar Inverter may only be opened by persons
authorised by Sunways AG to do so.
When circuit breakers are tripped, the fault cause
must be determined and eliminated before return-
ing the device to operation.
Check electrical equipment regularly.
Retighten loose connections.
Replace damaged lines/cables immediately.
2.4 Safety concept
The following parameters are monitored and
displayed continuously and simultaneously by the
inverter controller:
· DC overvoltage
· Overvoltage L1, L2, L3
· Undervoltage L1, L2, L3
· Isolated operation
· Over- / underfrequency L1
· Surge error (brief overvoltage L1)
· DC share in AC current
· AFI residual current
· Overtemperature of heat sink
When a malfunction occurs, feeding is immediately
interrupted and the Solar Inverter disconnects from
the grid by triggering the grid relay.
The potential-free alarm relay is switched (except
for grid undervoltage L1).
In addition, the following protective equipment in
accordance with overvoltage category III is provided
on the grid and on the solar generator side:
· Grid-side varistors
These protect the power semiconductors in case
of high-energy, short-term voltage peaks in the
grid and provide for an energy reduction in reac-
tor in case of a grid disconnection.
· Generator-side varistors
Varistors offer protection against atmospheric
overvoltages (e.g. caused by remote strikes dur-
ing thunderstorms).
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