SMA SSM-U-1615 - Manual (Page 47)

8.2 Disconnecting the DC Subdistribution
1. Disconnect the inverter DC side from voltage sources and secure against inadvertent
reconnection (see inverter manual).
2. If available, disconnect the external supply voltage of the DC subdistribution (see manual of
the inverter or manual of the external voltage source).
3. Disconnect all DC subdistributions that are connected in parallel in the DC connection area
and secure against inadvertent reconnection (see manual of the respective DC subdistribution).
How to disconnect the DC subdistribution specified in this manual is described in the following
steps.
4. Open the door of the DC subdistribution.
5. Switch the DC load-break switch off by turning the rotary handle on the DC load-break switch
to 0 (OFF, green zone).
This disconnects the PV array connected to the DC subdistribution from the inverter.
☑ The arrow on the rotary handle is pointing to 0 (OFF, green zone). The handle is in a
horizontal position.
6. Secure the DC load-break switch against reconnection. You can do this by attaching a
padlock (diameter: max. 6 mm) to the red inner section of the handle. You can push the red
inner section out from below.
7. Ensure that the string inputs are load-free.
8. Release and remove all DC connectors. To do
this, insert a regular or angled screwdriver
(blade width: 3.5 mm) into one of the slide slots
and pull the DC connectors straight out. Do not
pull on the cable.
9. Ensure that no voltage is present in the DC subdistribution.
Tip: Use the voltage test points in the protective cover to measure the voltage in the DC
subdistribution.
10. If the work can be carried out with the door of the DC subdistribution closed, close the door.
11. If the work to be carried out requires the door of the DC subdistribution to be open, secure the
door so that it cannot slam shut.
8.3 Switching the DC Subdistribution Back On
1. Open the door of the DC subdistribution.
2. Ensure that the DC load-break switch in the DC subdistribution is switched off and secured
against reconnection.
8 Disconnecting and Reconnecting SMA Solar Technology AG
Operating Manual 47 SSMUXX15-BE-en-10