the pump controller will interpret the required speed from the number of pulses received
I was not referencing length v width, they are the same, I was talking about number of pulses. The pump controller is measuring duty cycle (i.e. width/length) not counting pulses.
the pump controller will interpret the required speed from the number of pulses received
I was not referencing length v width, they are the same, I was talking about number of pulses. The pump controller is measuring duty cycle (i.e. width/length) not counting pulses.
I am referring to the inner working of the pump controller, and how it may possibly be tested.
I don't know what is inside the pump controller after the IC TLP2704, but the internal oscillator circuit will send pulses via the IC TLP2704, into the internal circuitry, whilst it is powered. The number of oscillator pulses sent for each duty cycle of the PWM signal, will be dependent upon the PWM pulse width. I can only assume that the internal circuitry, after the IC TLP2704, will know how to interpret the number of oscillator pulses, into the desired pump speed.
If you have additional information then please post it.
I have connected a Pulse generator to find out if one of my GRUNDFOS motors is working.
I varied the Pulse width from 10 us to 90 us and plotted the resulting flow rate.
My second , Radiator loop Grundfos motor is perfectly nearly linear over the 10 % to 90% signal change.
My Second motor is working perfectly!
Unfortunately this motor PWM input is not connected to anything, another missing bit of the jigsaw that is my "installers", now, year old attempt at installation.
I am still trying to get the first motor on the HEAT PUMP side of my Heat Exchanger to work!
@iantelescope so according to the logic of this (Correct me if I'm wrong)
you've proven that the radiator-side pump modulates as expected with a PWM source that you've built and configure yourself (PWM is not coming from the heat pump, right?).
So you have at least one grundfos PWM capable pump that PWM modulates properly (which is to be expected, given that grundfos should know what they are doing). am I right?
my next test would be to prove/disprove whether the ASHP-side pump modulates with the same PWM source? Is it the same pump type or different?
I have connected a Pulse generator to find out if one of my GRUNDFOS motors is working.
I varied the Pulse width from 10 us to 90 us and plotted the resulting flow rate.
My second , Radiator loop Grundfos motor is perfectly nearly linear over the 10 % to 90% signal change.
My Second motor is working perfectly!
Unfortunately this motor PWM input is not connected to anything, another missing bit of the jigsaw that is my "installers", now, year old attempt at installation.
I am still trying to get the first motor on the HEAT PUMP side of my Heat Exchanger to work!
ian
I am pleased that you are making some progress.
What is the operating frequency of the PWM on the pump that now functions correctly? Are the two pumps the same model or different? I assume that you have tried connecting the pulse generator to the first pump. What results did you obtain?
@iantelescope so by that logic, the pumps are fine but the PWM source (samsung control board) isn't. I have a PWM source that in theory is the same as yours that works absolutely fine.
I'd suggest a conversation with samsung tech support about your control board at this point. maybe its faulty.
If the timing on the graphs is milliseconds, then the PWM operating frequency from the Samsung PCB would appear to be approximately 2Hz.
Do you have any resistors to apply a little loading to the PCB output, to see what effect that would have on the voltage and waveform? What was the voltage level from the pulse generator? Did you try applying just a DC voltage to the pumps?
As far as I am aware, the control parameter for the pump speed is the DeltaT between LWT and RWT.
Do you know of a SAMSUNG TECH Support that is not pushing You tube videos that are always for a different model , in a different country , ........
My system appears to be unique .........getting answers or doable fixes ....seems very difficult after nearly a year of buck passing between my "installer",SAMSUNG and Telford.
I should have built this system by myself!
I suspect that I would be quicker by lashing up an Arduino or two to control Both Grundfos motors.
Do you know of a SAMSUNG TECH Support that is not pushing You tube videos that are always for a different model , in a different country , ........
My system appears to be unique .........getting answers or doable fixes ....seems very difficult after nearly a year of buck passing between my "installer",SAMSUNG and Telford.
I should have built this system by myself!
I suspect that I would be quicker by lashing up an Arduino or two to control Both Grundfos motors.
Anyway do you have a number or E-mail .....i
ian
what I am saying to you is that you appear to have clear logically provable evidence that your particular samsung controller board is faulty on its PWM output.
within this sentence i am speculating: I have read other commentary earlier in this thread from @grahamh that PWM didn't work on samsungs - maybe it didn't work on some samsung controller boards which includes yours?
mine DEFINATELY works.
So what I meant was (if you are minded to), you could raise a faulty board / possible warranty replacement issue via however you bought it, on the grounds of "PWM doesn't work"?
I have no relationship with samsung of any sort , not for me to tell you who to call or email. I am a homeowner with a physics + engineering professional background who has DIY installed a heat pump and has some technical knowledge and information acquired prior to / as a result of that work.
your system doesn't sound unique to me but thats by the by. and not sure what telford have to do with it???
you could indeed do this with an arduino or other microcontroller. have looked at the same thing myself. up to you if you go that way.
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