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20-08-2016 #1
Hi all,
Just wondering if it is necessary to use the enable pins, I notice a lot of setups do not use them. What is the purpose of them? Any drawbacks to not using them?
Thanks
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20-08-2016 #3
So it would be a good idea to use them then? It is only an one extra wire to hook up.
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21-08-2016 #5
I use a Pilz safety relay which sends an e-mail stop signal to the motion controller, takes power off the driver power supply, and also removes the enable signal from the drivers. One of those should stop the machine! The safety relay is tripped by the e-stop switches and the driver fault signals which are all wired in series. There are enough relay contacts on the safety relay to do that so, as you say, for the sake of a piece of wire it's easy enough to do. I wanted to make sure that the stall detect would stop the machine as I am using slaved motors for the X axis.
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21-08-2016 #6
[Posted twice]
Last edited by Neale; 21-08-2016 at 06:47 AM.
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Doesn't the EN pin free the motor so you can do a bit of manual positioning? If so it makes for a crummy emergency stop because there is no braking. OTOH if your drivers have no pattern memory and revert to a set home pattern when you switch on, then EN would be a good option if you wanted everything to cool down while you replaced a broken tool, went out to buy milk, fags etc.
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24-08-2016 #8
You don't have to use them, they are automatically pulled to the enable state by internal circuitry in the drive, if you connect the appropriate external circuit for your drive to pull the enable pin to the disable state the drive is disabled.
It's down to you to decide if you need this function and what for, if you don't need to disable the drives ignore it as enabled is the default state for common drives,
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You think that's too expensive? You're not a Model Engineer are you? :D
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30-10-2019 #9
I know this is an old thread, but for folks searching for information about using the enable pin: Check the current requirements of your driver input and the current capability of your BOB/controller before you hook multiple enables to a single output on your BOB. A lot of the drivers draw 12+ MA. on their input pin and some BOB/Controllers can only source as little as 24mA.
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