Contactors

[tazz]

We go a stage further, most of the lighting is controlled by computer. The trackside lighting switches off during break times and end of shift, the high bay lighting switches off outside production hours just leaving pilot lighting for safety, we can override any of them if necessary.

Yes but the computer is still connected to contactors..

 

[Robotstar5]

Yes but the computer is still connected to contactors..

Correct.

 

[shanky887614]

Yes but the computer is still connected to contactors..

its just a fancy timer connected to a contactor

 

[Knobhead]

Plant lighting switching sequence:
First one in Sunday morning, switch lights on.
Last one out the following Saturday evening, switch lights off.

Who needs a computer?

Or the fist plant I worked on as an apprentice and was involved in building.
Switch lights on.
I know a switch was fitted somewhere, I haven’t a clue where it was.

 

[Robotstar5]

Plant lighting switching sequence:
First one in Sunday morning, switch lights on.
Last one out the following Saturday evening, switch lights off.

Who needs a computer?

I suppose it's an energy saving idea, having literally thousands of light fittings even turning them off for the 15 minute breaks must save money?

The new multi-storey carpark has LED striplights that are on dim for safety but kick up to full brightness when triggered by vehicle/pedestrian movement! I wondered what was going on when I first used it

 

[Knobhead]

I know what happened last time I tried an energy saving idea. The dreaded voltage optimisation. 4 20MVA transformers and muggin’s got cond in to lowering the plant voltage.
I said it would end in disaster……………….. It did!
I didn’t get an invite to the arse kicking party that followed. The accountant did, it was his idea.

 

[ackbarthestar]

Pretty common to switch all sorts of multiple circuits using a single contactor
such as card keys for hotel rooms.
I use them for switching the coil circuit via a rf key fob to power up lighting DBs