SMA GRID CONNECT BOX 12 - Manual (Page 28)

10 Maintenance SMA Solar Technology AG
28 GRID-BOX-12-3-20-BE-en-10 Operating Manual
10 Maintenance
10.1 Inspection of Residual-Current Devices
Requirement:
☐ The utility grid must be connected to the multicluster system.
Procedure:
1. Stop the multicluster system at the master of the main cluster (see operating manual of the Sunny Island inverter).
2. Perform the following test on residual-current device F339 in the Grid Connect Box:
• Press the [TEST] button.
☑ The residual-current device trips.
✖ The residual-current device fails to trip?
• Disconnect the Grid Connect Box and multicluster system (see Section 8, page 22).
• Contact the SMA Service Line (see Section 13, page 35). This will trigger the requisite spare parts order.
• If the residual-current device has tripped, wait at least five seconds.
• Reactivate the residual-current device. To do this, move the switch lever of the residual-current device into the ON
position.
3. Start the system at the master of the main cluster (see operating manual of Sunny Island inverter).
4. Document the test result in accordance with the locally applicable standards and directives. This is your proof that
regular inspection has taken place.
Inspection interval for residual-current devices
The inspection interval for residual-current devices depends on the prevailing operating temperature.
• At prevailing operating temperature up to 40°C: every 6 months
• At prevailing operating temperature over 40°C: every 3 months
Instruction of end users
The test of the residual-current device is not hazardous and can be performed by the end user. However, if the
residual-current device does not trip, a qualified person is required to disconnect the Multicluster Box and the
multicluster system from voltage sources.
• Instruct the end user on the necessary procedure.
• Remind the end user that the inspection interval must be complied with.
• Point out to the end user that in the event of the residual-current device not tripping, a qualified person is required
to perform the next steps.
Supply of loads temporarily disconnected
During testing of the residual-current devices the connection to the utility grid is temporarily disconnected. The
supply of the loads is also interrupted.
• Switch off sensitive loads prior to the test.