SMA STP 50-40 Operating Manual page 51

SMA Solar Technology AG
Damage to the product due to ground fault on DC side during operation
Due to the transformerless topology of the product, the occurrence of ground faults on DC side
during operation can lead to irreparable damage. Damages to the product due to a faulty or
damaged DC installation are not covered by warranty. The product is equipped with a protective
device that checks whether a ground fault is present during the starting sequence. The product is
not protected during operation.
• Ensure that the DC installation is carried out correctly and no ground fault occurs during
operation.
Damage to the DC connectors due to the use of contact cleaner of other
cleaning agents
Some contact cleaners or other cleaning agents may contain substances that decompose the
plastic of the DC connectors.
• Do not use contact cleaners or other cleaning agents for cleaning the DC connectors.
Destruction of the inverter due to overvoltage
If the open-circuit voltage of the PV modules exceeds the maximum input voltage of the inverter,
the inverter can be destroyed due to overvoltage.
• If the open-circuit voltage of the PV modules exceeds the maximum input voltage of the
inverter, do not connect any strings to the inverter and check the design of the PV system.
Procedure:
1. Ensure that the miniature circuit breaker is switched off and that it cannot be reconnected.
2. Turn the DC load-break switch of the inverter to
position O.
Operating manual
NOTICE
NOTICE
NOTICE
6 Electrical Connection
O
STP50-4x-BE-en-23 51