H6 Hybrid Inverter - Installation & Operation Guide
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3.8.3 - Fireman Switch Sequence
Personnel responding to an emergency must press the Fireman Switch. When the Fireman
Switch is used, then the rapid shutdown sequence proceeds as follows:
1. The SolarCity H6 inverter detects the activation of the Fireman Switch and:
- Illuminates the red LED.
- Displays the message “Fireman Switch 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.
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 its output voltage down to 0V within ~500ms. The
remaining voltage on the battery pack power cable remains because it is still connected
to the bulk voltage of the Inverter.
6. The inverter activates the active discharge circuit of the inverter bulk voltage after 9.5s.
The remaining battery pack power cable and inverter bulk voltage will be discharged
within 100ms.
After 9.6s, all voltages on the PV power and battery pack power cables will be below 30V.
The LCD screen may display the following message(s) related to the Fireman Switch:
• Fireman Switch Activated
• Fireman Switch Error (may be due to incorrect installation)
Note: If the Fireman Switch is engaged when the inverter is off-grid and
when there is no PV power, then you will need to follow the procedure
described in “Dark-Start Feature” on page 70 to resume normal
operation.
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