Disassembling The Defective Power Unit - SMA SB Series Replacement Manual

6 Disassembling the Defective Power Unit

6 Disassembling the Defective Power Unit
Prior to disassembling the defective Power Unit, all connections between the Power Unit and the
Connection Unit must be severed. Only then can the Power Unit be removed from the Connection
Unit. Except the ribbon cable, all cables connected to the communication assembly can remain
plugged in and do not need to be removed to disassemble the Power Unit.
Compatibility problems when mixing up the inverter versions
The Power Unit type "SBx.xSPUS41PU-AT" is exclusively approved for use with inverters of the
type " SBx.x-1SP-US-41 The inverter can only be distinguished by the type plate. Mounting the
Power Unit on the inverter of the type "SBx.x-1SP-US-40" causes problems with the firmware of
inverter.
The serial number of the inverter does not change when the power unit is replaced.
Procedure:
1. Check on the type label that the Power Unit supplied and the inverter are of the same type
before disassembly. If the power unit does not match the inverter, contact the Service
department (see Section 9, page 18).
2. Disconnect the inverter from all voltage sources (see Section 5, page 10).
3. Remove the terminal block with the connected DC
conductors from slot DC-in. To do this, unscrew the
screws using a flat-blade screwdriver (blade width:
4 mm (5⁄32 in)) and pull the terminal block out of
the slot. While doing so, only touch the terminal
block on the black enclosure.
4. Remove the terminal block with the connected AC
conductors from slot AC-out. To do this, unscrew the
screws using a flat-blade screwdriver (blade width:
4 mm (5⁄32 in)) and pull the terminal block out of
the slot.
12 SBxx-1SP-US-41-PU-RM-xx-10
SMA Solar Technology AG
Replacement Manual