12-17-2008, 01:17 AM
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| | | Join Date: Jul 2007 Location: Sweden
Posts: 886
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Hi Mick,
I really can't tell you what is strictly neccessary. All I can tell you is what I've done: I have my motor powersupply switched on and off by a large contactor, this contactor is controlled by the E-stop circuit which gets its power from the low voltage powersupply. So, I can't turn on the motor power supply if the low voltage power supply isn't already on.
When I E-stop the system the contactor switching the motor power supply switches in a resistor across the capacitor bank that discharges it around 1.5second.
Obviously, if I get a power failure both the low voltage supply and the motor power supply will be switched off at the same time - I have no idea what happens then.... :-/ Hopefully there's enough capacitance in the logic supply to keep the drive alive long enough to prevent terminal damage....
Again, I've never had any problems like this myself but judging from others it seems it's a bit too sensitive this power sequencing thing :-/
I hope you can get it going again!
/Henrik.  |
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