In the solar assembly, Rapid Shutdown is initiated by pushing the System Shutdown Switch. Once the System Shutdown Switch has been pushed, the solar assembly will stop power conversion and initiate Rapid Shutdown (all MCIs will open and DC voltages will drop to safe levels). Once the solar assembly is in this state, it is safe to perform service.

To service the solar assembly:

1. Push the System Shutdown Switch to initiate Rapid Shutdown.
   • This will bring the DC voltage to a safe level.
2. Secure the System Shutdown Switch in the open (OFF) position.
3. Using a Phillips head screwdriver, loosen the captive screw on the solar assembly door and open the door.
4. Remove the DC isolator connector:
   1. Push the plastic lever to release the DC isolator connector.
   2. Remove the DC isolator connector.

      

   Warning

   The DC isolator is not load breaking. Ensure AC power is disconnected before unplugging this connector.
   Note

   The connector inside the unit that serves as the DC isolator is defined as a Disconnecting Means for Isolating PV Equipment in compliance with NEC sec. 690.15.
5. Wait 5 minutes before proceeding.
   Warning

   Risk of electric shock from stored energy. Wait 5 minutes after disconnecting all sources of supply before proceeding.
6. Using a suitable measuring device:
   1. Place the test probe in each rectangular opening in the DC-in terminal blocks to ensure there is no voltage present.
   2. Place the test probe in each rectangular opening in the equipment grounding conductor block to ensure there is no voltage present.
   3. Place the test probe in each rectangular opening in the AC-out terminal block to ensure there is no voltage present.
   Note

   See Appendix B: Wiring Reference for a labeled diagram of all terminal blocks.
7. Using cabinet tip or electronics tip slotted screwdriver (up to 3.2 mm or 1/8 inch):
   1. Open the jaws of each opening in the DC-in terminal blocks and unplug each wire from the blocks.
   2. Open the jaws of each opening in the AC-out terminal blocks and unplug each wire from the block.
   3. Open the jaws of each opening in the ground conductor terminal blocks and unplug each wire from the block.
8. If performing any work away from the solar assembly enclosure, close the solar assembly door and lock and tag it out using the lock hasps on the enclosure door.