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Unread 27-09-2010, 22:52
Alan Ing Alan Ing is offline
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Re: Denso Window Motors, Warning - Don't use with Jaguars !

Quote:
Originally Posted by theprgramerdude View Post
Personally, I've experienced the jaguars holding the stall current of CIM's for a little under a second, easily about 100-110 amps (we were running 2 CIM's on 2 jags, so, bit of a voltage drop and thus lower curent). The .2 seconds wasn't even close to what I was seeing before the flashing red lights came on.
We had a similar problem at Championships. We built a swerve drive using denso motors for steering and 2 cims per drive transmissions. Our students noted that we would lose partial power when reversing and it would continue until the stick was centered. We put our machine on blocks and noted the blinking Jaguars. We then replaced the Jaguars but to no avail. Finally we got a hold of the TI guy (sorry can't remember his name) and he basically told us that the Jags were faulting when we changed motor directions too quickly (This was happening even when the machine was on blocks). Said the cutoff was around 40 amps. No. our drivetrain does not have excessive friction in it everything is properly supported with ball bearing and properly tensioned and it was geared for intermediate speed. With that said our students swapped out the Jaguars at home to victors after verifying that our machine was still doing this and poof! Problem solved. It would seem that the Jaguars have some really neat features, but for some things, they are just too smart for their own good (or they are just too smart for us ). I think it would really help if they could raise that trip current for the fault protection. We didn't have any issues in 2009 with the Jaguar going into a fault condition, probably because of the Regolith playing surface.