Use PWM to control your Jebao DCT pump using brushless motor controller from ebay
- Thread starter d0ughb0y
- Start date
theatrus
100-mile-commuter
That's one idea. Most of the time the controller supports dynamic brakes (shunt coil energy to ground) so the motor slows faster. Simply leaving the FETs in brake mode would be plenty and not consume any extra power.
karimwassef
Active member
I'll just run in very slow flow. That's good enough.
I'll measure the voltage on the controller power input when I get home in a couple of weeks.
On the road, so can't help much for a bit.
I'll measure the voltage on the controller power input when I get home in a couple of weeks.
On the road, so can't help much for a bit.
d0ughb0y
Active member
I installed my dct4000 pump in my sump over the weekend and it works nicely. I am using the stock controller for now.
I just ordered a cp-40 today. The price dropped to $87. That's like 1/3 the price of a gyre. I'll test the ebay controller on the cp-40 to see if it works.
I just ordered a cp-40 today. The price dropped to $87. That's like 1/3 the price of a gyre. I'll test the ebay controller on the cp-40 to see if it works.
karimwassef
Active member
What are all the mods that improved performance?
Dactylopterus
New member
What if we use the stock controller and control the power supply voltage from 12-24V with the APEX? Is it possible to do that? I have a WP40 running for a long time at 12V without any problems. I could try driving the DCS7000 pump with stock controller at 12 volts to see if it runs and how much flow it has. Will this damage the controller?
d0ughb0y
Active member
just what I posted in post 213.
you will need tools for surface mount soldering to do it.
theatrus
100-mile-commuter
The stock controller shuts down if the input voltage is less than about 18V from experimenting on the bench. Otherwise would have been a good idea
karimwassef
Active member
But you know, the concept of modifying the stock controller is intriguing.
Can't we access the 0-5V speed pin on the controller chip and disconnect the button controlled signal???
I think there are two controllers- a simple one for managing the buttons and feed input and converting it to a DC level signal. The power controller takes that signal and drives the phases through the expensive FETs...
Why waste all that? Just connect the APEX 0-5V onto the pin.
Can't we access the 0-5V speed pin on the controller chip and disconnect the button controlled signal???
I think there are two controllers- a simple one for managing the buttons and feed input and converting it to a DC level signal. The power controller takes that signal and drives the phases through the expensive FETs...
Why waste all that? Just connect the APEX 0-5V onto the pin.
karimwassef
Active member
What's the stock controller IC? It must have some way to control speed
karimwassef
Active member
How does it connect to the button outputs?
theatrus
100-mile-commuter
Use PWM to control your Jebao DCT pump using brushless motor controller from ebay
Excuse my probe lead wires. SW3 and SW2 is all you'd need. You can either use a FET across the button, or just feed 0/5V to the controller pin.
Note that the LEDs are multiplexed, so if you wanted to confirm the pump status you'd need to filter that out (Q14 and Q15) in firmware.
Excuse my probe lead wires. SW3 and SW2 is all you'd need. You can either use a FET across the button, or just feed 0/5V to the controller pin.
Note that the LEDs are multiplexed, so if you wanted to confirm the pump status you'd need to filter that out (Q14 and Q15) in firmware.
karimwassef
Active member
That's viable, but the idea was to achieve greater granularity by using a 0-5V signal directly from an Apex V output divided.
To recreate button pushes that emulate the desired Apex voltage would need a tiny arduino.
To recreate button pushes that emulate the desired Apex voltage would need a tiny arduino.
karimwassef
Active member
So why are there two controller chips?
d0ughb0y
Active member
There is only one, U3 is the controller. U2 is LM339, you can see the chip marking if you shine a light on the chip at an angle.
From what I remember when I traced the signals, each of the 11 LEDs connect to the mcu. 3 switch, 6 motor driver, 3 bemf, 1 current sensor, 1 voltage detector, +5, gnd. that's 27 pins. I can't remember what the last pin connects to.
So in order to get the same functionality (or to use the same size board), the replacement mcu must have at least 26 IO lines. Plus a pwm and a direction pin, that's 28 IO lines, more if you want more functionalities. So an atmega328 will not work as replacement. But if you want no frills simple controller that is controllable by pwm, then atmega328 will work just fine. I plan to build a no frills one for starters.
From what I remember when I traced the signals, each of the 11 LEDs connect to the mcu. 3 switch, 6 motor driver, 3 bemf, 1 current sensor, 1 voltage detector, +5, gnd. that's 27 pins. I can't remember what the last pin connects to.
So in order to get the same functionality (or to use the same size board), the replacement mcu must have at least 26 IO lines. Plus a pwm and a direction pin, that's 28 IO lines, more if you want more functionalities. So an atmega328 will not work as replacement. But if you want no frills simple controller that is controllable by pwm, then atmega328 will work just fine. I plan to build a no frills one for starters.
Last edited:
theatrus
100-mile-commuter
Use PWM to control your Jebao DCT pump using brushless motor controller from ebay
U2 is a comparator (need to check the part number) used for the sensing.
I'm mostly thinking U3 is an MCU due to:
The five 0.1" pads next to the chip smell like a programming header.
Q6/Q7/Q8 are part of the main FET driver circuitry. A dedicated motor controller would likely have these on chip.
U2 is a comparator (need to check the part number) used for the sensing.
I'm mostly thinking U3 is an MCU due to:
The five 0.1" pads next to the chip smell like a programming header.
Q6/Q7/Q8 are part of the main FET driver circuitry. A dedicated motor controller would likely have these on chip.
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