Is it safe to supply this RBS steering signal through the MultiRS relay?

DIY
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1

I am building up my 3-phase MultiRS system and have installed two remote TBS 48V 350A Remote Battery Switches to be able to securely disconnect the DC side in case of smoke or CO alarm or when one of the emergency buttons is pressed.

The two emergency buttons (one in the house, one in the garage near the installation) will each control REMOTE L/H on a MultiRS. The Smoke and CO alarm operate a relay and I can use that signal with AUX_IN configured as a safety switch I assume.

I can control the RBS manually (for a start-up sequence ), or via a control wire (for emergency). In single wire mode, it allows me to operate them via a NO/NC connection and I would like to control their state via the relay in the MultiRS.

The RBS manual states:

  • +Vdc continuous on brown wire to close, 0Vdc on brown wire to open.
  • Control wire supply current @ 60V < 2.5mA (when active)
  • Control wire threshold voltage > 5Vdc

Is it safe to put the battery supply voltage through a 1A fuse and supply the required power via the MultiRS relais? The documentation states it is rated at 1A at 70VDC. That is significantly below the 2.5mA and I don’t expect a massive inrush from a control wire.

But I could be wrong :slight_smile: So would it be safe to operate this way?

2

All good there. You are under the max voltage and amps

3

Remember to wire the emergency stop as a normally closed contact (for wire-break protection).

4

Thanks @lxonline

@Karl-Heinz, I rather do a NC configuration
It is a safety feature, so when my safety feature has a failure, I rather experience that through a power loss, rather than pushing the button in an emergency to find out it doesn’t work anymore.

5

Yes, NC = normally closed

I think we’re both referring to the same type of circuit.

6

Does anyone know if Victron has placed a diode across the relay for flyback protection?

Or do I need to add that to the circuit?