Author Topic: Controled stopping when fence is open  (Read 763 times)

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Offline Lemster68

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Re: Controled stopping when fence is open
« Reply #15 on: July 11, 2018, 04:43:38 PM »
I have worked on quite a few cells which incorporate a request to enter button/switch.  Use a condition monitor to look for the request to enter, stop program and spindle, and only then, unlock the gate.

Offline NovaFlatline

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Re: Controled stopping when fence is open
« Reply #16 on: July 12, 2018, 12:59:23 AM »
I dont fully understand the condition handler, but if the logic states what im reading to be correct this is whats happening.

"Watch this input"

"While doing these programs"

Loop to beginning.

That would make sense.

Hawk i am confused on "category 1 stop" .
In order for me to stop my VFD i need to...
1, turn off my forward direction
2, reset VFD
3, turn on reverse direction (hold on for 2 seconds)
4, reset VFD again.

This will stop my spindle from 20,000 rpm to a dead stop. In two seconds. Regardless of any effect it has on the VFD or brake resistor. Im only driving 300 Hz at 7 amps. Not much, but enough.

In order for me to wire the VFD appropriately i would need three relays. One to handle forward and reverse, forward would be on a "NC" and reverse would be on "NO" with one relay handling the power to that relay coil to control which connection​ on the VFD is the input.  And the third to reset the VFD. Im going tonhavr to think about this alot more now that i am looking at it. Kinda makes your head spin.

A permission to enter would be nice for a closed cell, but we run 3 min cycle times and need to enter the cell after each part. I would like to use some light screens and saftey sensors, but at this time there is not a place in the budget for these things.
« Last Edit: July 12, 2018, 01:07:33 AM by NovaFlatline »

Offline HawkME

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Re: Controled stopping when fence is open
« Reply #17 on: July 12, 2018, 05:42:34 PM »
Category 1 would be a safety rated controlled stop. But if you are already using a timer to kill the VFD then you wouldn't necessarily need to do this.

 I guess I don't understand why you need to do the revers direction thing and not just give a stop command to the VFD, which could be done by a relay or BG Logic, or Condition handler.

What controller version are you using? BG Logic is in Menu>Setup>BG Logic.

Offline Fabian Munoz

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Re: Controled stopping when fence is open
« Reply #18 on: July 12, 2018, 08:08:53 PM »
Maybe the spindle overshoots when stops (abrupt) and need to go reverse to find itself again.

We actually use some motor controls that they are running FWD and to stop it we turn BWD on