SMA SC 400HE Installation - Manual (Page 14)

Safety SMA Solar Technology AG
14 SCxxxHE-IEN104432 Installation Guide
The device contains capacitors on the AC and DC sides that must discharge once the device has been
switched off. After switching off, dangerous accidental-contact voltages remain within the device for
several minutes. If there is a fault in the device, these voltages may also be present for a longer period
of time. Wait at least 5 minutes after switching off the device before opening the device.
To extract the fuses, the Plexiglass cover must be removed. Immediately reinstall the cover after the
cover has been removed from one pole and the fuse has been extracted. The cover must always be
mounted unless a fuse is to be extracted.
WARNING!
Risk of lethal electric shock!
• To avoid arcing, the load-free status of the device must be checked with a current
probe (using a clamp-on ammeter) before removing the DC input fuses. The fuses
may only be inserted or removed using the appropriate personal protective
equipment and fuse carrier.
• When the DC fuses (internal or external) have been inserted, reverse voltage exists,
via the Sunny Central busbars, on all externally connected DC main distribution
boxes and DC sub-distribution boxes (Sunny String-Monitor).
• In the event of a failure, the DC contactor may carry a life-threatening DC voltage!
• The discharge time of the capacitors is longer than 5 minutes.
Disconnecting plant parts without danger
We recommend the extra use of external DC circuit breakers for disconnecting the
Sunny Central, DC main cables and Sunny String-Monitor; DC circuit breakers are
optionally available. This allows system components to be safely isolated, even in the case
of faults or fire.