Hi Mark, May be you can answer my question. I don't understand why do we need to have triac devices 2.5~3times the rated line voltage. I have been doing a bit more readings during the past few days, also articles as suggestedby jbartos, it seems that dv/dt and di/dt during commutation is...
Hi Mark, charn is right, most of the standard cirucuits that implying pulse transformers use 6 to drive back to back SCRs for the output, if I use just 3 triacs how will the drive circuit looks like? Also I am using microprocessor output to drive optotriac in the old design, do I need to buffer...
Hi Mark and cbarn,
Thanks both of you for the valuable advices. It seems that using optotriac is not a feasible method in building a three phase softstarter, I will try to build using pulse transformers then. I was successful in using optotriacs to drive small 3-phase motors (<3kW,2poles), that...
Hi Marke,
Thanks for the prompt response.For your information I am using a MOC3052(peak off-voltage 600V) to drive a Teccor Q8025 25A Alernister Triac (Vdrm 800V) in 400V ac. Also I have tried the il4218(peak off-voltage 800V) optotriac and not much improvement. 800V Vdrm is the max. rating I...
I have a problem, would appreciate some help.
I am building a 3 phase softstarter using opto-triac moc3052 to drive 25A output triac. I am experiencing various motor rattling and doesn't matter how I change the snubber circuit, it behaves the same. What did I do wrong? Is optotriac not suitable...
