SMA SC 500HE-US Maintenance Manual - Manual (Page 20)

4 Maintenance SMA America, LLC
20 SC500HEUS-eng-WH-IUS120411 Maintenance Manual
Figure 4: Position of the miniature circuit-breaker
1. Set the key switch of the inverter to "Stop."
2. Check whether the DC and AC contactors audibly shut off within 5 seconds or less.
If the DC and AC contactors do not audibly shut off within 5 seconds or less, contact the
SMA Service Line.
3. Disconnect the inverter from the DC side of the PV array via the external DC disconnecting
device and ensure that it cannot be reconnected.
4. When using the Disconnect Unit:
– Disconnect the AC and DC sides using the Disconnect Unit's disconnect switch and ensure
that it cannot be reconnected (see the Disconnect Unit installation manual).
5. Disconnect the inverter on the AC side from the power distribution grid via the external
AC disconnecting device and ensure that it cannot be reconnected.
Position Designation
A Miniature circuit-breaker for the external control voltage
B Miniature circuit-breaker for the internal control voltage
C Miniature circuit-breaker for the voltage meter