Partial Jag failure?

[kamocat]

This one was configured for coast.

[Al Skierkiewicz]

tech,
Marshall said he checked using voltage mode after the controller failed. Vbus is used when the target speed on the motor is known and the input voltage is variable. In CAN bus Voltage mode, this is a requirement to maintain motor speed in the absence of a rotational sensor. Again it is a calculation used to make the output voltage appear to be regulated. It does not regulate the output voltage but it does modify the PWM output to the motor to simulate voltage changes. Again, the Vbus must be monitored in all modes even if only used for internal protections.
It is not necessary to fill the server with text that is easily found somewhere else. If you would like you can delete your earlier posts or I can. Just let me know.

[kamocat]

I'm sorry, I wasn't clear enough.
I used %vbus mode (the original voltage mode), not the voltage compensation mode you refer to here.

[techhelpbb]

Originally Posted by kamocat

I'm sorry, I wasn't clear enough.
I used %vbus mode (the original voltage mode), not the voltage compensation mode you refer to here.

What mode were you using when you pushed the Jaguar over the current limits?

[kamocat]

Originally Posted by techhelpbb

What mode were you using when you pushed the Jaguar over the current limits?

Either %vbus or position. Perhaps both.

[diviney]

Originally Posted by Mike Betts

JW,

If you look at the spec sheet for the MX5-A40, you can pull 133A through the circuit breaker for about 3 seconds before it trips. This can be a long time for a resistor to gain heat depending on the thermal resistance of the resistor.

Mike:

I was looking for breaker information when I found your post... You state that the MX5-A40 can deliver 133A for around 3 seconds. As I read the data sheet, 133A represents around a 300% overload, which would trip in substantially less than 3 seconds (0.5 to 1.1 seconds). Am I missing something?

-Tom

[Al Skierkiewicz]

Tom,
You reading is correct. The smaller breakers have a slightly different trip spec and the 120 amp breaker is longer still. However, all of the resettable breakers will have a shorter trip spec after the first reset as the breaker is already at an elevated temperature. This is also compromised if the breaker is in a hot environment. i.e. near a hard working motor(s) or thermal shadow, adjacent breakers are also passing a lot of current or if the wiring attached to the PD has not been properly terminated (high resistance) and is creating heat from the termination.