Not quite true we have setups with one power supply and two or more frequens converters on the same DC bus without running regenerative mode.
This is to save space in the cabinets and you need less power supplies in this setup, we still run totally separate movements on the motors.
NAFO...
Some basics about VFDs the DC bus is not what determines the speed of the motors connected to each VDF its the servo part of the VDF that does that, with some kind of feedback on the motor taco or impulse generator if you want a exact speed.
The DC bus only converts AC to DC that is then...
LOL
Maybe you are using a different font than me, because my large X has not got 90 degree angles between the "lines".
NAFO Sergeant Anna Gr 69th Sniffing Brigade
Both yes and no.
What I meant was that since these two cable types should not be put together at all, you should strive to never cross them at all.
Which is the basic rule.
Since structure59 didn't leave much info on the status of the cables, I didn't feel it was necessary to go into all the...
The basic rules are that the motor cable must be shielded and the shield must be unbroken between the VFD and the motor and connected to the potential earth in both ends.
The same trules goes for a communication cable it should also be shielded and the shield potentially grounded in both ends...
Here the rule was to go over all screw terminals one year after installation tightening them to required tightening torque while the machine just had been running being at working temperature.
For the reasons bacon4life has given.
The reason for this as I was told was that when you make the...
The Baumer is a alternating PNP/NPN so you will have 24VDC out on the output when you chose NO normally open if the the input device is connected as in your functional diagram with your input needing a positive signal in and the sensor is detects something.
If it is NC normally closed you will...
At the moment I can't do that since the motor and pump isn't here yet, it is 5 weeks to installation.
When this started we were buying a turnkey installation but due to incompetence on all sides, it ended up with me and my hydraulic coworking doing almost all the job [mad] and I am the one that...
Well I did calculate the Tacc with this formula but here they call it Cacc?
And got the value 129,9762
And then the time becomes Tst = ((0.0583 + 0.00289)/129.9762)*157 =0.073912224s
Better?
NAFO Sergeant Anna Gr 69th Sniffing Brigade
We are exchanging a supply unit with several hydraulic pumps.
We have 3 pumps supplied through the same fuses 250A they each have their own motor breaker.
Previously it was a 11 kW, 5.5kW and a 0.75 kW.
The 0.75 kW only starts occasionally and very rarely.
The other 2 start almost...
In which way does the safety breaks cylinders break, is it the sealings?
What pressure do you have when you are driving the press in auto on the 31 (130bar) manometer?
NAFO Sergeant Anna Gr 69th Sniffing Brigade
Half true since the motors only function is to supply the hydraulic system via the pump with 40 liters/min.
By reducing the pressure on the pressure reducer 31 (130bar) you will be able to drain of the excess 8 liters that the higher rpm on the motor gives you.
So there is no need to use a VFD...
I am a bit curious, has this been a problem from the start the commissioning?
Or did it turn up later?
And who did the commissioning?
And who decided it was to be put on 410 Volt transformator?
Does it tripp at start?
Or after running a while?
How often do you stop and start that motor?
As I...
Now everything becomes very hypothetically. [ponder]
In Europe and Sweden we have 400VAC 50Hz so any motor I would put in would be rated 400/690V, 50hz, IE3 or if it is a small one 230/400V 50Hz IE3 that is EU standard.
And no at least I have never encountered the symptoms of too low voltage.
We...
I would have to call the power company, the largest in Sweden and ask what the h.ll they were up too. [bigsmile]
That has never happened, the opposite have happened though but that is another story.
I think you misunderstood me, maybe it is my Swedish humor?
I didn't strongly suggest...
