I have a coldroom fan which must start running upon start button. At the start of running process, a timer should be activated to countdown 3 hours. Timer must be set once by designer, users must not adjust process timer. When there is power Cut, the timer must not restart, but must continue...
Thanx for all contributions. I modified the design so that it could do the job. I considered all your contribution. In the future, i think i would need to use PLC but have no starting point for PLC development. Any references so that i can learn hw to do automatic processes using siemens s7?
Need to start packhouse motors driving conveyor belts of Fruits. Want to use equal flip flop timer to run about 15 motors (0.37 -0.75kw).The last Belt must run first and the first(At Fruit entrance) must run last otherwise fruits will pille at the next consecutive belt. Must operate manually or...
Help, I have 415V, 150A which i want to transmit with ABC 50mmsq ALI 3 Core(XLPE)+ Bare Support over 350 Metre. From specs, 3 Phase vdrop is 1.43mv/A/m
Hence Vd=150*350*1.43/1000 =75V Phase to Phase. Which is too much. Where am I making the mistake?
Vitzwaters
Thanx, will use repeat cycle timer. will post circuit when thru, not a problem but i am being trained so that i will be designing on my own soon.
vitzwaters
I was asked by a workmet, he said can there be a control circuit to start may motors in sequence using one timer? i am thinking but u may aid me.
Vitzwates RSA
warross,
The left ckt conected on u1 and u3 is to detect the mains supply as u sugested in first step.note my ckt was based on your 10/12/12 advice, maybe i did the wrong way, then you must rephrase that i may do it properly.
Ckt explanation:
if u1 and u3 have power, Line relay #L is...
i will do my homework whole heartedly, bt your advice i suggest should be long ways, ie, i want to wire the intelock not to use one component with interlock already.
I put my n/o and n/c as switches, not used to the sw for drawing so the S are seeing slava are contacts, goog explnation is...
Bill, 12/12/08,
I want the mains to be independent, but its effect on mains conductor is my concern on behaviour of mains contactor. when power cut is detected thru n/o or n/c of mains contactor, genset must switch on at no load, wait for few seconds and energise the genset contactor. if power...
Bill,
I did not put the circuit for any test yet, but analyse the attachment.http://files.engineering.com/getfile.aspx?folder=430dde51-8ba1-466c-bd10-df2a66855c17&file=Gen-test.pdf
warros, it sounds easy but not easy. my boss has said i must use less relays, at most 2, is a chicky boss. Am a junior engineer so only theoretical, plz help with a drawing
help design a change over control circuit for LV from utility line contactor to genset contactor in event of power cut. also want to remove load before switching off genset, when power is back.
