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Posted By: djhCat6 can supply 600 mA per "mode" (pair of pairs).
Posted By: djhOther possibilities include pushing a higher voltage AC down the wire, to reduce current draw and losses, and then transform it down to 12 V just before the lock.
Posted By: Peter_in_HungaryWhich gives about 7W.
Or just install a thicker cable!
Posted By: Simon Still10V is the voltage at the cable ends at the lock when the power supply is in circuit (and is the same if the wires are connected to the lock or not)
Posted By: Simon StillI'm thinking I should order the 24V 460mA coil and it will be fine?
Posted By: Simon Still(but surely since the load is momentary - say half a second) that isn't going to be an issue?
Posted By: Peter_in_Hungary
I am surprised that the voltage is the same between load and no load. Generally speaking if the cable is at its limit then I would expect a (significant) drop in the voltage when the lock is energised as against the no load voltagePosted By: Simon StillI'm thinking I should order the 24V 460mA coil and it will be fine?
The 24v coil quoted as 460mA is 24v DC, I thought we were talking about AC coils
Can you run a temporary thicker cable to test / prove that it is an inadequate cable causing the problem? And how easy would it be to replace the existing cable?
I set the HA system to sent 12V to the lock for 10 seconds or so to get a reading. My multimeter was reading a stable 9.8v whether the coils were connected or not. Maybe there's a lot of headroom built into the coil spec - actually the load is not as high as documented?
There are AC and DC coils available. Using AC gives the loud characteristic buzz when active. That's often a useful signifier to a user that the lock has released and to push the gate. In my case it's just annoying (the gate part opens when the lock releases) so DC is preferable.
(replacing cable isnt' an option)
Posted By: dpmillerI'm guessing the power and current quoted is steady-state, but what is the inrush current?
Posted By: Simon StillHow do i measure it? Why is it important?
Posted By: Peter_in_Hungary0,.63A I presume is 0.6A = 630mA power supply. The coil at 460mA would be running at 73% of the power supplys capability so it should be OK. I am assuming here that the power supply output is DC and that the output of 630mA is the DC rated output.
Posted By: djhIt seems likely that it is marginal voltage/power that is causing the lock not to work, and lubricating it has reduced the power necessary for the moment. In which case, substituting a 24 V power supply and coil should improve things; only time will tell whether it improves things enough that you tolerate whatever lubrication regime is implied. An adjustable power supply, adjusted to provide 24 V at the lock, would be even better.
Posted By: Simon StillI've measured voltages across the power supply terminals and at the lock. The drop is about the same. With nothing else connected I get about 22V at the lock (so can probably turn up the power supply to get 24V)
However, the current is reading 1.6A !!@! which makes me think they've sent me the wrong 24V coil. They'd packaged it by taping the coil to a piece of cardboard. The packing tape tore then label off the coil and wasn't readable....
Posted By: sam_catAs for local regulation, one of these works for me (for other uses)
https://www.amazon.co.uk/gp/product/B00GY01UMC
Posted By: djhI don't quite understand that. What do you mean by "The drop is about the same."? Also what is the voltage at the power supply when everything is connected?
Posted By: djhCall them and ask them how to identify the coil, either visually or by electrical measurements.
Posted By: djhPS if you edit your posts and select Html formatting, the quoting will work.