45
Copyright 2017 SolarCity Corporation. All rights reserved.
Chapter 1 - Welcome
3.8.4 - DC Disconnect Switch Sequence
Personnel responding to an emergency must turn the DC Disconnect Switch in the SolarCity
H6 inverter to the OFF position. If the Fireman Switch is not available and/or not used, then
the then the rapid shutdown sequence proceeds as follows:
1. The SolarCity H6 inverter detects the activation of the DC Disconnect Switch and:
- Illuminates the red LED.
- Displays the message “DC Disconnect Activated” on the LCD Display.
- Disables the AC Inverter stage and opens the AI relays.
- Switches off the power supply to the PLC Transmitter.
2. The PLC Transmitter stops PLC communications with the RSS box(es).
3. The RSS box(es) disconnect the PV panels from the PV power cables. Any remaining
voltage on the PV power cables between the RSS box(es) and the SolarCity H6 inverter will
discharge below 30V within less than ten (10) seconds. The open DC Disconnect switch
means that these cables are not connected to the inverter bulk voltage.
4. Concurrently with Steps 2 and 3, the inverter sends the disable signal for the battery
pack.
5. The battery pack shuts off and brings the output voltage down to 0V within ~500ms.
After 9.5s, all voltages on the PV power and battery pack power cables should be below 30V.
Note: The open DC Disconnect Switch means that it is not necessary to
actively discharge the inverter bulk voltage.
To Next Page
Loading...