MotL not starting

Hi. it is me again 

As you can see group error is ON. I checked on help it says

The following parameters are taken into consideration when forming the group error:

·         CSF = 0

·         Trip  = 1

·         MonDynErr = 0

·         MonStaErr  = 0

·         FaultExt  =  0

This means everything is fine. Then why Start is OFF?

Please note that I just used the process tag of PCS7, nothing more.

Regards,

Hi Idir,

how did you give the "Start" command?
If the block is in Manual mode you have to use the Inputs for start and stop in Manual mode.

Make also the  outputs "MonDynErr" and "MonStaErr" visible.

At the Picture there is a Feedback error. Because the Feedback run is "1" but in this case it should be "0". Did you simulate the Feedback?

Hello,

I connected PV_out to StartMan, but now StartMan does not want to go High even though PV_out is High,

there is also this weird phenomenon: the start out put goes flashes between High and Low, when it high Grperr is low, but when it's low grperr is High. still StartMan=0 ???

Hello,

PV_OUT to StartMan?? So you connect the feedback signal of the motor to the manual start of the motor...hmmm, that is not correct. I suggest you read the PCS78 AP library and study it.... I think you don't know how the block operates...

StartMan is your manual input to start the motor, operated from the OS block.

Please do the following changes:

- Set your ModLiOp to 1

- Set AutModLi to 1 and ManModLi to 0

- Connect Start of the Motor block to the SimPV_In of the FbkRun block

- Set SimOn to 1 at the FbkRun block

- Make sure the driver blocks have a "0" at the parameter Bad, so no error will be send to the motor block. Set driver blocks in simulation

- Set StartAut in order to start the motor. I don't know if you did something with the Feature parameters, because you can define button behavior: Switch or latch buttons to start/stop and set to auto/manual.  

Thanks for the help. I checked in the APL manual. But I still got this issue of starting it. Also, why simulating ?

Regards,

Hi,

Still struggling... 

Hi, I managed to get PV_Out = 1 from PcsDiOu but only using simulation because it has SimPV_in as feedback input of Start. but what about using PV_In directly? It keeps signaling the MonDynEr!

thanks.

hello,

I've been modifying the cfc until i came out to this point. why is bad 1 ?

Regards,

Hi Idir,

I am back...

The block with the name 'FbkRun' is a channel driver for a digital value from the field. In a real plant you usually connect the address of the input of an auxillary contact of the main contactor wich switches the motor to this block. This block passes the binary information (0 or 1) then to the input 'FbkRun' of the block with name 'Motor'. It seems that you are actually don't have a contactor and you just wan't to act like having a contactor by wich the motor is switched. Do I understand this right? If so, you should do the following:

The output 'Start' from the block 'Motor' is actually connected to PV_In of the block 'FbkRun'. This is wrong. To this input (PV_In) usually the input address e.g. 'I 0.0' or the symbol of an address is connected to. You may think now that instead of an real input you just want to give the value of output 'Start' to this block. But here is your mistake in thinking. By this you will never get rid of the 'Bad' of this block and so the block will not pass throuh the value of 'PV_In'. Remember what I told you about the driver in PCS7, the plausibility check of signals by the driver concept and the @charts. Only if  'PV_In' is connected to an valid address and the channel is healthy 'Bad' will disapear. An other possibility when 'Bad' is disapearing is when the channel driver is in simulation. But then the block will also not pass through the value of 'PV_In'. It will pass through the value at input 'SimPv_In'. So just connect 'SimPv_In' instead of 'PV_In'  and set 'SimOn' to '1'.

But if you really have motor wich is switched by a contactor then just connect the correct input address of the auxillary contact to 'PV_In'.

BTW... In PCS7 all your adresses should go via input/output drivers and not directly from an address to a function block (see your connections to StartMan and StopMan).

The next mistake is that not 'StartMan' and 'StopMan' should be used to control the motor by any logic (with 'any logic' I mean everything comming not by operation from faceplate). Use the Inputs 'StartAut' and 'StopAut' instead.

Best regards,

mark

Idir

Thanks for the help. I checked in the APL manual. But I still got this issue of starting it. Also, why simulating ?

Regards,

 Idir,

In your first picture (Motor+) you connected "Start" (Motor block) to "SimPV_In". That is correct. But your PV_Out (FbkRun block) was connected to "StartAut". That is wrong...it should be connected to "FbkRun". StartAut is your automatic start signal (from SFC or CFC). I didn't put this in my previous post, I thought that was clear to you...

For the simulation: When you generate driver blocks, the system will get the hardware address and the settings. If you have a digital signal, a mode will be generated, for example -> 16#8000FFFF. The system monitors this signal. If it is not OK, a "1" at Bad will occur. If you do not have real inputs/outputs, you will use simulation. In that case, you can influence the input/output by yourself and you don't have to worry about errors...