What is that? You realise there is no connection from 12v to either relay coil so nothing will happen...

Your observation is correct, attached is the new circuit given by Gemini

 

Your observation is correct, attached is the new circuit given by Gemini

Sorry, but Gemini has its head up it's a...

With those changes there's no relay contacts left for the motor (without additional relays), and there is still no power to the top relay.

 

Here is a logic diagram of a commercially available 2-stop 115vac system.
You would have to make mods for 220vac.
Maybe it will help understand how it works.

https://eilifts.com/wp-content/uploads/2021/01/RL-2-stops-11-8-18.pdf

 

Suggestion #2 with limit switches.

 

Here is a logic diagram of a commercially available 2-stop 115vac system.
You would have to make mods for 220vac.
Maybe it will help understand how it works.

https://eilifts.com/wp-content/uploads/2021/01/RL-2-stops-11-8-18.pdf

Thanks @eetech00

@ajeetkhk I'll draw you a diagram to work from that's easier to follow... this version however uses two buttons per level '1' and '2'. on level 1 '1' calls, '2' sends, while on level 2 '1' sends, '2' calls. It maybe possible to do it with one button per level with additional parts...

 

OK, got a working one - just need to tidy it up... tomorrow

 

"This setup is working well. The diagram below was cleaned up by Gemini and now looks professionally drafted."

 

OK, got a working one - just need to tidy it up... tomorrow

Thanks very much. Highly appreciated.

 

Thanks @eetech00

@ajeetkhk I'll draw you a diagram to work from that's easier to follow... this version however uses two buttons per level '1' and '2'. on level 1 '1' calls, '2' sends, while on level 2 '1' sends, '2' calls. It maybe possible to do it with one button per level with additional parts...

Thanks very much. Highly appreciated.

 

Thanks very much. Highly appreciated.

No problem, however a slight hitch - it needs relays with 3 changeover contacts, or 4 relays with 2 changeover contacts if using nothing but relays... I may be able to get round it - watch this space...

 

That last circuit you posted (#27) looks, at first glance, like it might work until you realise the limit switches are labelled incorrectly. Also it needs 2 push buttons on each floor to allow call and send functions.

 

there can be multiple buttons wired in parallel for up (PB1) or down (PB2).

pressing any of the up buttons (PB1) latches up relay (K1) until top position is reached (LS1).
also interlocking contacts are added so while K1 is active, K2 cannot be activated.

circuit is fully symmetrical so it works the same way in reverse:

pressing any of the down buttons (PB2) latches up relay (K2) until down position is reached (LS2).
also interlocking contacts are added so while K2 is active, K1 cannot be activated.

you can add also stop buttons.. just wire them as NC contacts that interrupt circuit power

 

OK,so here it is. Turned out a lot simpler to work from scratch. Note this is very basic, there are no interlocks or safety features for doors etc. These could be added easily. Most concerning though is the switching of a low DC voltage and AC mains on the same relay. I'm not an advocate of this practice, and would prefer to see a second pair of relays to avoid it, but that's your call. The main difference between this and other circuits is the use of two sets of limit switches on each level, one NC and one NO, and blocking diodes, to steer the call request to the appropriate relay, allowing a single call/send button per level.

How it works

Assume the car is on level 0, so Level_0_Limit_NC is open and Level_0_Limit_NO is closed, and the opposite is true for the Level_1_Limit_XX limit switches.

When the call button on either floor is pressed, current flows from +12v through diodes D3 or D4 and whichever NO and NC switches are both currently closed. In this case, since the car is on Level 0, this will be Level_0_Limit_NO and Level_1__Limit_NC, switching on RELAY_UP, which, through Level_1_Limit_NC, latches the relay. and sends AC to the motor, raising the car. As it rises, Level_0_Limit_NO opens which, since Level_1_Limit_NO is still open, isolates the call buttons from the relays.

When the car reaches Level 1, the Level_1_Limit_NC switch opens, powering off RELAY_UP and stopping the motor. Additionally, Level_1_Limit_NO closes, ready to route a future push button press through the now closed Level_0_Limit_NC to RELAY_DOWN, and returning the car to Level 0. Thus either button will call or send the car depending on its current location. If a button is held down, the car will happily go up and down ad infinitum.

Diodes D1 and D2 catch the voltage spike generated by the relay coils when the current is switched off. They aren't essential but its good practice to include them. All diodes are type 1N4007. The limit switches are standard roller SPDT 240v/5A microswitches, two at each level. They are only switching 50mA or so, so good quality ones are preferred.

.

If anyone is interested, I have an LTSpice simulation of this demonstrating it working.

 

it could be just one limit switch (or microswitch) for each position - each can have NO/NC/COM terminals (form C).
never mind, i did not see the switch labels...

what happens when car is half way and power goes out? both relays will go off. so when power is restored what is recovery?
i suppose one could try manually actuating one of limit switches (if accessible). that will drive car to that level. once either relay is energized circuit will keep on working.

 

it could be just one limit switch (or microswitch) for each position - each can have NO/NC/COM terminals (form C).
never mind, i did not see the switch labels...

what happens when car is half way and power goes out? both relays will go off. so when power is restored what is recovery?
i suppose one could try manually actuating one of limit switches (if accessible). that will drive car to that level. once either relay is energized circuit will keep on working.

Yes, they have to be independent switches.

I recognise it's quite simplistic and assumes the car is on one or other level at power up. It should be easy to add a reset button, either manual or automated to return car to level 0 on power up if it's midway...

 

Here's the 'resettable' version, with 'power out' safety relay. After a power outage the AC remains isolated until 'Reset' is pressed, restoring AC power and signalling to send the car to Level 0 (unless it's already there).

 

I'm so disappointed with the community
It took a long time and multiple goes to find an answer.
For us with controls and motor controls experience, we would recognise the problem as a reversing starter for an electric motor, with limit switches and start pushbuttons.
The circuit is as standard and old as the hills.

 

speak for yourself...

i think those in need of an immediate answer have an option to call an electrician or engineering company, pay for consultation and have at least one suggestion within hours. considering that people here volunteer and post replies pro bono, out of goodness of their heart, and based on free time available, any attempt to an answer (right or wrong) should be appreciated.
since you are all about speedy solutions - where were you for the past 5 days?

 

For us with controls and motor controls experience, we would recognise the problem as a reversing starter for an electric motor, with limit switches and start pushbuttons.

If it were so simple, how come I couldn't find a single simple and complete ie., instantly usable, solution online in any of the obvious and some not so obvious places?

The circuit is as standard and old as the hills.

Is it? Please provide a link to a working solution that matches the brief, uses a single button at each level and just 2 dpdt relays

 

what happens when car is half way and power goes out? both relays will go off. so when power is restored what is recovery?
i suppose one could try manually actuating one of limit switches (if accessible). that will drive car to that level. once either relay is energized circuit will keep on working.

You halfway answered the question yourself.

What happens is the relay doing the call de-energizes, the car stops exactly where it is, when power is restored since none of the call relays are energized the car just sits there.

If it's in the middle, then either call button can be used to restart the lift motor in that direction.

Adding an Emergency-Stop button could be added to the system that interrupts the relay coil power, essentially the same as a power failure would, as long as the stop button is active, the relay coils have no power.

Most commercially available systems use contactors to drive the motor with the relay as the trigger for the contactor (more or less a relay design for electric motor power), rather then using the relay itself. Electric motors have a large in-rush current, basically double their run current on start up.

In the elifts schematic they have a ton of safety interlocks. It appears that these interlocks interrupt the Com circuit on the motor controller, at least the NC ones do.

Their motor is essentially a 3 phase motor that the controller swaps a couple phases on depending on which direction it wants the motor spin. A connection between Com and Di1 activates the motor in the up direction, where as Com and Di2 sends it down.

The in-use indicator is on the motors e-brake circuit, for those types of motors you have to energize that circuit for the motor to be able to spin, so essentially they're indicating that the motors e-brake is commanded off.

They have 2 buttons on each level, button 1 is the Down Call, button 2 is the up Call.