I’m upgrading my e-bike and using a Makerbase 84200HP ESC, but I ran into an issue with the Power Switch Pin (Which I will call PSP).
- Power Switch Pin Behavior:
- I initially connected the PSP directly to battery voltage, but it turns out that’s not correct.
- The ESC operates as follows:
- ESC OFF: PSP → Ground connection.
- ESC ON: PSP → Floating state (not connected to anything).
- The esc never turns on or off, I have it set to always off, off after 10 min, but I never see the state change because of the above
- Key Switch Behavior:
- My key switch behaves unintuitively to me:
- “Off”: Internally connected, so I get 72V on both sides of the key wires.
- “On”: Internally disconnected, showing 0V across the wires.
- DC-to-DC Converter:
- The DC-to-DC converter works as expected:
- Key “On”: Converter is on.
- Key “Off”: Converter is off.
- This makes sense with the standard where devices turn on when a switch pulls to low (ground).
My Questions:
- I’m confused about how the PSP behaves between “ground” and “floating.”
- For example, when the key is “off,” I assume the PSP is at 72V or floating.
- When the key is “on,” I think the PSP is at 0V. Is this not equivalent to ground?
- Is there a component (like a relay or switch) that can:
- Pull the PSP to ground when 0V is applied to its input pin,
- And still handle a 72V system?
Any advice or recommendations are greatly appreciated! Thanks in advance!
