* 1 Phase or 3 Phase?I am designing a Pump Soft Starter using PIC16F877A and Snubberless 600V 40A type motor. I am going to use this with a 1.5 HP monoblock pump.
Usually Yes. In detail it depends on your circuit and the control scheme.I want to know can I use single TRIAC instead of using 2 SCRs ?
It depends on the inertia, the expected input current, ...What should be the ramp up delay duration in seconds ?
I don´t think it depends on pump HP rating. Why do you think it should be based on HP rating?How to find out what is the initial phase angle required to start the pump based on HP rating ?
Spend some minutes with Excel and get this:I want to run the motor even if mains voltage is 270V but only 230 to 240V has to be applied to motor. For this how to calculate load voltage based on Phase angle that needs to be applied at the end of the ramping ?
Not that simple. But possible.Can I measure the load voltage while ramping using ADC and control the final firing angle which maintains constant 230V for the motor/pump ?
Snubberless 600V 40A type motor. I am going to use this with a 1.5 HP monoblock pump.
Hi,
* 1 Phase or 3 Phase?
* how can this be: "600V 40A type motor" <--> "1.5 HP monoblock pump" ?
I expect a pump not having overly increased start up current (compared to the steady current). Are you ssre you need a soft starter?
I don´t think it depends on pump HP rating. Why do you think it should be based on HP rating?
Spend some minutes with Excel and get this:
Not that simple. But possible.
I´ve designed a measurement tool exactly for this. It is for 50Hz and calculates and outputs the exact true RMS value of V and I every fullwave.
(and P and I_avg and V_avg).
But you can try an energy metering IC. Not sure how fast the filters are and the how good they work with phase controlled AC...
Klaus
your initial question:Based on HP starting and running currents will come into consideration and we are controlling load voltage which also controls current as resistance and inductance of pump motor winding is fixed. So, Phase angle will control the voltage and also load current (especially startup current). This is my analysis. Correct me if I am wrong.
I understand this: phase_angle <--> pump_HP_ratingHow to find out what is the initial phase angle required to start the pump based on HP rating ?
I also wonder if soft start is an actual requirement for water pumps. I never heard about it.
Hi,
Not that simple. But possible.
I´ve designed a measurement tool exactly for this. It is for 50Hz and calculates and outputs the exact true RMS value of V and I every fullwave.
(and P and I_avg and V_avg).
But you can try an energy metering IC. Not sure how fast the filters are and the how good they work with phase controlled AC...
Klaus
if((TMR1IE_bit) && (TMR1IF_bit)) {
TMR1IF_bit = 0;
TMR1ON_bit = 0;
//Enter your code here
TRIAC_GATE_TRIGGER = TRIAC_GATE_ON;
InitTimer2();
}
Timer2_Init();
TMR2ON_bit = 1;
because for the other purpose that is to maintain constant 230V to load after pump start if mains voltage is greater than 230V.
What makes you think that RMS is voltage is the quantity you want to measure and control? This is motor rather than lighting or heater control.
So what else "motor voltage" if not "RMS voltage"?I want to run the motor even if mains voltage is 270V but only 230 to 240V has to be applied to motor. For this how to calculate load voltage based on Phase angle that needs to be applied at the end of the ramping ?
Never heared about this. Does it mean 0V is the worst case? ;-)Most motors get damaged because of low voltage;
This 1V fluctuation should be more than sufficient.The load voltage is fluctuating between two values after reaching almost stable value that is between 229 and 230V.
Can somebody tell me how to improve the code and get stable load voltage.
Never heared about this. Does it mean 0V is the worst case?
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