SMA SC 200 Installation - Manual (Page 11)

SMA Solar Technology AG Safety
Installation Guide SC20_25_35-IEN094521 11
5. If necessary cover or protect against accidental contact with any voltage-carrying components.
The individual safety rules are listed in greater detail below:
Disconnection (in the event of team connection: both team members must be
disconnected)
If the Sunny Central is running with team connection, disconnect both the team leader and the team
device. The following list shows which sources of voltage must be be disconnected:
1. Grid voltage for grid feeding (AC main switch)
2. Grid voltage for the supply the system's power supply (if the system draws its power supply from
external sources)
3. DC voltage from the photovoltaic generator
– Unplug the DC fuses to disconnect the photovoltaic generator. The DC fuses of the two poles
are behind the protective covers. Remove the protective covers to pull the DC fuses. Never
remove both covers simultaneously. After removing the fuses on one pole, attach the covers
again.
– Pull the DC input fuses only when the load is off to prevent dangerous arcing. Use a clip-on
ammeter to measure whether the DC input is off-load. The DC input fuses may only be
removed with personal safety equipment and a fuse grip. There are three ways to disconnect
the DC voltage from the photovoltaic generator:
– Pull the internal DC input fuse
– Pull the external DC input fuse (if a Sunny Main Box is used)
– Via an external circuit breaker (if available)
4. DC voltage for team connection (if team connection is used)
5. Additional external voltage (e.g. emergency shut-off)
Even deactivated Sunny Central units may contain voltages which are dangerous to the touch. After
deactivating the Sunny Central, wait at least 5 minutes until all capacitors are discharged before
starting to work on the Sunny Central.
When the DC fuses are inserted in the Sunny Central (on both team members if team connection is
used), there is a reverse voltage on the DC main and sub-distributors.
Ensure that the device cannot be reconnected
Ensure that the Sunny Central cannot be reactivated.
Ensure that no voltage is present in the system
Ensure that all internal and external sources of voltage are disconnected.
Disconnecting system parts without danger
We recommend additional DC circuit breakers for the Sunny Central, the main DC lines
and Sunny String-Monitors. DC circuit breakers allow system parts to be disconnected
without danger.