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- The killswitch MCU has an Enable Line (PB9) and Monitor Line (PB5)
- The Enable Line is an output from the MCU that causes the relays to close if the killswitches are closed
- The Monitor Line is an input to the MCU that measures the state of the killswitches
- Enable
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- activates high side driver which sends a
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- 12V signal to the
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- killswitches
- If both killswitches are closed, the signal returns to the BMS carrier and powers the main relay
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- coils
- If a killswitch is pressed (Open), the relay coils do not receive
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- the 12V and they open, shutting off the car
- A monitor line is required because the regulations require the car to enter into a BPS fault when a
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- killswitch is pressed
- We need a way of measuring if the signal has come back to the BMS carrier from the
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- killswitches
- Lower-left corner of schematic page 5
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- shows a voltage divider that sends a
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- 3.
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- 3V monitor signal
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- if killswitches are closed and 0V if killswitches are open
Changes that probably need to be made to MS12 plutus to work with MS14 bms carrier board (if that firmware is reused, not comprehensive)
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