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Old 06/19/2017, 07:20 AM   #451
karimwassef
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How much power can the board handle?
Why 15 kHz? Is it the pulse timing for the commutation that's driving the resolution?


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Old 06/19/2017, 11:49 AM   #452
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Based on current evidence, the FET drivers could handle the large DCT-15000 pump, however the currently installed current shunt limits the current and that pump caps out before it gets anywhere close to 100W average.

The DCT-4000 and 6000 run at their rated power.

Of course you can already buy a controller for Apex-to-DCT (would love a teardown), but this is at least pretty universal for sensorless motors.

The PWM signal is effectively coupled directly to the FET drive, so if your frequency is too low you'll have your drive off for most of a phase, hence it will rapidly stall the motor. One quirk is the controller still sees BEMF and thinks its running when the rotor is stalled - there is some nasty EMI flying around here likely contributing to this.


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Old 06/19/2017, 11:52 AM   #453
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I got one of those. Want me to take it apart for pictures?

Actually, if you really want, I'll send it to you for diagnostics.

As long as I get a "materials cost" build of your version when it works... LOL

I'm serious though


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Old 06/19/2017, 12:57 PM   #454
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Quote:
Originally Posted by karimwassef View Post
I got one of those. Want me to take it apart for pictures?

Actually, if you really want, I'll send it to you for diagnostics.

As long as I get a "materials cost" build of your version when it works... LOL

I'm serious though
Pictures are fine - either it will be a known controller, or an unbadged or unknown/MCU driven approach.


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Old 06/19/2017, 01:27 PM   #455
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so for the fish street controller, how do you configure it to work with the different dct pumps and the cross flow? dip switch?

I figure this is to switch the current sense resistor value. I don't think the start and run sequence would be any different


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Old 06/19/2017, 01:31 PM   #456
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Quote:
Originally Posted by d0ughb0y View Post
so for the fish street controller, how do you configure it to work with the different dct pumps and the cross flow? dip switch?

I figure this is to switch the current sense resistor value. I don't think the start and run sequence would be any different
The manual shows DIP switches for the various pumps. And yeah, I imagine its just the current limit.


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Old 06/19/2017, 02:13 PM   #457
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Quote:
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Pictures are fine - either it will be a known controller, or an unbadged or unknown/MCU driven approach.
But don't you want to monitor their commutation during start up


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Old 06/19/2017, 02:14 PM   #458
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I'll take pics

Was hoping for more invasive testing that I don't have the bandwidth to do now.


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Old 06/19/2017, 03:21 PM   #459
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In case you're really itching to see the startup waveform:



Motor is running at about 100ms in.


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Old 06/19/2017, 03:57 PM   #460
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picture didn't make it... scratch scratch


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