Single ph to 3 ph Ramp conversion.

[davesparks]

The control circuit will need a 24V supply, this will need to be fed from a permanent supply, not from the output of an inverter.

 

[Patrick Cox]

The control circuit will need a 24V supply, this will need to be fed from a permanent supply, not from the output of an inverter.

I believe this is done through a facility within the inverter , that is correct.

 

[James]

Many inverters have a 24v out for running switches for the digital inputs.
Not many have the required power output to run contactors and other equipment that you might need in the control panel.
The original wiring of the control will have some sort of fail safe for stopping the motor if overtraveled.
This will need to be used to drop the power to the nverter if not in safe position.

 

[James]

Your electrical engineer should be able to provide you with a wiring diagram for his proposed control system.
If you want to know any more, post the diagram.
There are many here with experience in the right field to give it a thumbs up or down.

When you say this is a ramp, I presume you mean a car ramp to work under.
Make no mistake, not doing this correctly could lead to serious injury or death.

 

[Patrick Cox]

Your electrical engineer should be able to provide you with a wiring diagram for his proposed control system.
If you want to know any more, post the diagram.
There are many here with experience in the right field to give it a thumbs up or down.

When you say this is a ramp, I presume you mean a car ramp to work under.
Make no mistake, not doing this correctly could lead to serious injury or death.

This is exactly why I am on here , I have also made contact with an previous installer of these ramps in original conditions.
Direct drives from whom I have purchased the inverter from (not yet received) have a back to wiring assistance.Here is the spec of the one I bought:
Here is spec from direct drives:

This model is a 30A 240V input with 240V 3 Phase 18.5A output and sensorless vector motor control for 200% torque from 0 RPM and thats required for car ramp applications,

Specifications
Attribute Value
Power Rating 4 kW
Phase 1
Supply Voltage 230 V
Current Rating 21 A
Output Frequency 0.1 → 400Hz
Overall Width 170mm
Overall Length 128mm
Overall Depth 180mm
Control Panel Yes
Field Bus Communication Type Profibus
IP Rating IP20

 

[James]

The spec of the inverter sounds about right, can’t tell without seeing the motor rating plate.

There are many ways this can be made to work but only a couple of ways to make this safe.
I doubt either of these companies will provide you with a wiring diagram of what you are describing.

 

[Patrick Cox]

Here is the motor plate , however the invertor is on its way , so hopefully having paid a lot of money and had a long discussion with the company, it should be good.

 

[James]

Ok, so you have a 2.2kw motor
Not sure why they recommend a 4kw inverter especially as it is only for very intermittent duty.

I would have more likely specified a 2.2kw inverter.

Don’t forget that this will probably require a new enclosure, I doubt it will fit in the original.

 

[Patrick Cox]

I’m only guessing that , at the time, it’s said that most of the cheaper ones although they are rated at 2.2kw they would not cope with full load with a vehicle halfway up on the lift to put it up further unless you put it down to the bottom first.
I’m not sure about fitting it with present arrangement , I would have thought that it would be wired side by side ,
Or as I have proposed on a panel board opposite .

 

[James]

P.s. do not underestimate the complexity of programming a Siemens inverter.
Especially as this is a special application requiring sensorless vector and 200% overload.

It is far more complex than a standard voltage/frequency control.

Although in theory it can be done from the built in control panel, it makes life really tough.
Try to find someone local with experience with Siemens control systems.
They will have the software and programming cables to plug a laptop in to correctly set up and document the system.

 

[Patrick Cox]

Not sure if it’s Siemens or otherwise, haven’t got it yet , but mindful in what your saying.
Thanks

 

[James]

Last line of spec.
Profibus communication
This is Siemens own communications protocol
I would be amazed if it is not one of there drives

 

[Patrick Cox]

Ah

 

[Patrick Cox]

Moving on a bit with the Inverter fully installed in a waterproof cabinet and the safety system wired through it to stall if any problems it has worked perfectly . Thanks for all your advice in the past.