SMA MEDIUM VOLTAGE POWER STATION 500SC-JP - Page 155

Figure 48: Switch positions of the AC disconnection unit from ABB
Position Designation Explanation
A
Switch position on
The AC disconnection unit is closed.
B Central switch position The AC disconnection unit was tripped and is open.
C
Switch position off
The AC disconnection unit is open.
Additionally required maintenance material (not included in the scope of delivery):
☐ Test device approved by the manufacturer of the AC disconnection unit, e.g. TT1 by ABB
Danger to life from electric shock due to live voltage
High voltages are present in the conductive components of the inverter. Touching live components results in death or
serious injury due to electric shock.
• After switching off the inverter, wait at least 15minutes before opening it to allow the capacitors to discharge
completely.
• Wear suitable personal protective equipment for all work on the product.
• All work must be carried out in accordance with this document. All safety information must be observed.
• Do not touch any live components of the inverter or the medium-voltage grid. Comply with all applicable safety
regulations for handling medium-voltage grids.
Procedure:
1. Use the test device to check whether the AC disconnection unit is ready for operation (instructions for testing are
included in the documentation of the testing device).
2. If the AC disconnection unit is not ready for operation, contact (see Section17 "Contact", page256).
10 Maintenance
SMA Solar Technology AG
System Manual 155MVPS22JP-SH-en-11