Wiring for regen

4 years 10 months ago #29531620 by griz11
Wiring for regen was created by griz11
On my application I have a removable battery. For charging and its out of the bot when its stored. So even with a diode pathway to dump the regen current without the battery it has nowhere to go. So what is going to happen if I have the battery out and the bot happens to roll some? Also the way I have it wired up is with a relay. Using the normally closed side for the pathway for the regen current with a diode. Do you see any problems doing it this way. The controllers with the can bus will be here in a few days so I want to have all this finished up. Thanks for getting that taken care of for me.

Dan

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4 years 10 months ago #29531636 by roboteq
Replied by roboteq on topic Wiring for regen
The simplest and safest thing to do is to ground the power control line when the battery is out. This will shut off the controller totally and if voltage is generated from your motor because you are pushing it, nothing will happen.

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4 years 9 months ago #29531713 by gg
Replied by gg on topic Wiring for regen
What if I need regen up to a certain amount? My controller can handle 60V max. I need to allow regen for up to the max. Will the controller's overvoltage protection do the trick and shut off the controller when regen exceeds 60V or do I need to take additional precautions?

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4 years 9 months ago #29531730 by niko
Replied by niko on topic Wiring for regen
The maximum regeneration Volts is a matter of the battery volts not of the controller limits.

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4 years 9 months ago #29531731 by gg
Replied by gg on topic Wiring for regen
I am talking about the configuration where the main battery is disconnected during regeneration. How about then?

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4 years 9 months ago #29531734 by niko
Replied by niko on topic Wiring for regen
Without a battery, the regen current has nowhere to go and the voltage will keep rising until a path is found. Overvoltage protection will disable the MOSFETs when the voltage rises above that limit and thus stopping regeneration. However when the voltage drops below the limit, the MOSFTETs will reengage and if the motors have a lot of inertia, regen voltage can suddenly jump to very unsafe levels. You whould therefore never operate without the battery if regen can occur.

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