Inverter Remote Stop button.

[fishy-steveParticipant @fishy-steve]

Did the article ever get written?

I'm running my Meddings drill using the IMO Jaguar Cub inverter. I currently run it directly from the inverter but I want to run it from a remote control station. Start/Stop and speed control pot.

[Nick HulmeParticipant @nickhulme30114]

Posted by Neil Wyatt on 19/02/2014 11:25:19:

There are four ways of 'stopping' an inverter powered motor.

1 An e-stop button before the inverter. This makes the motor coast to a stop and kills all power. It can damage the inverter, but is 100% guareanteed to cut all power.

2 Use the coast to stop function of the inverter. This works exactly as an e-stop but leave the inverter live. It can be wired to work from a 'break' switch so existing e-stop buttons can be used as well as limit switches etc. I have impemented this and it works. The stop is very sudden with my setup.

3 Fit a resistive brake to the inverter. This will more or less short the motor and it will stop dead. This is MUCH faster than with an e-stop, especially for machines with a lot of rotational inertia. It will leave the inverter itself live. This can be wired to be operated by e-stop and limit switches. I have not implemented this.

4 Use normal soft-stop buttons. This causes the motor to slow down gently to a stop over a preset period.

My approach is to use 4 for normal working as gentle stop/start helps avoid motor overheating and is less fraught. I use approach 2 for e-stop as it is very fast with my machine. The cautious would take approach 1 and in indiustry i'm sure they would use number 4 – active braking – to get the fastest stop possible.

Neil

Don't forget DC Injection Braking, an option available on many good drives which although not as fast as using a braking resistor is still quick enough to require positive retention on screw-on chucks to ensure they don't go on safari

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