SMA MD.SEN-US-40, Installation Manual, Page: 14 / 36

5 Mounting SMA Solar Technology AG
Installation Manual MDSEN-US-40-IA-en-13 14
Procedure:
1. DANGER
Danger to life due to high voltages of the PV array
When exposed to sunlight, the PV array generates dangerous DC voltage, which is present
in the DC conductors and the live components of the inverter. Touching the DC conductors
or the live components can lead to lethal electric shocks.
• Prior to performing any work on the inverter, always disconnect the inverter from
voltage sources on the AC and DC sides as described in the inverter manual. When
doing so, note that even if the DC load-break is switched off, there will be dangerous
direct voltage present in the DC conductors of the inverter.
2. To achieve an optimum WLAN range, the module should ideally be installed on module slot
M1 . Perform the following steps:
• Guide the 3 guide pins on the communication
assembly through the holes in the module. The
holes in which the guide pins must be inserted
depend on the module slot.
• Carefully push the module down on the upper
edge and on the connection sockets at the
same time ( ) until it audibly snaps into both
side locking tabs of the communication
assembly ( ). The connector strip on the back
of the module is automatically pushed into the
socket terminal strip of the communication
assembly.
CLICK CLICK
3. Tighten the fastening screw with a Torx screwdriver
(TX 25) on the module (torque: 1.5 Nm (13 in-lb)).
This additionally fixes the module in place and
grounds it in the inverter enclosure.