Is my PWM-520 broken?

I have a cFP-PWM-520 module for controlling some electric heaters, but it doesn't work. The module is connected to eight solid state relays which in turn controls the heaters. Regardless of duty cycle setting, voltage supply or channel, the output is always zero (Vout-COM voltage is zero), but the status indicator is lit. I know this indicates a short circuit so I have tried the two different ways to reset the channels several times, but with no luck.
The relays are working when I connect 24V directly to them. So is this module broken? If it is, what could be the reason? A faulty power supply delivered 36V to Vsup on the module for a short while (about one minute), could this be the reason?
Thanks
Martin

Hello Kevin,
Don't mean to jump in here, but, I've been around Mac's since 1984 and have only re-installed a system on one occasion when I knew I messed it up with an optimizing program that crashed before it was done.
Are you having any other issues with you system than you are describing above? Although it may resolve your problem you will not know why. As Andy-O once described it, it is like taking a "sludge-hammer" to solve the problem.
If you are not having other issues with your system then insuring that your preferences for those programs are set properly and that the camera is compatible with the OS and hardware in the Mini ( I don't know what you have on the portable) - it could be you may need a driver for it to work.
[WARNING: a little levity : so before you add any fluid to your headlights ( http://www.joe-ks.com/MultiMedia/LowHeadlightFluid.asf ) look to the simple things]
Mini 1.42GHzG4/512/80/SD/Radeon9200/56 Mac OS X (10.3.9)

Similar Messages

How can i connect FP-PWM-520 8-Channel, 5 or 24 V PWM to computer

Hi
How can i connect FP-PWM-520 8-Channel, 5 or 24 V PWM to computer.
Is it supports for Programmble interface(specially using LABVIEW).
Give me the details to interface connector hardware and software description.
Thankq all
Mahesh.

Hi Mahesh,
It sounds like you are just getting started with using the FP-PWM-520.
Since you are looking for rather general information I would recommend that you search ni.com for 'FP-PWM-520' and you should find plenty of relevant links.
Connection info can be found in the Operating Instructions Manual which is linked off of the Product Page. More general information can be found on the DataSheet.
As with all other National Instruments products you can easily program
and control FieldPoint from LabVIEW. Don't forget to download the
latest version of FieldPoint (currently NI-FieldPoint Version 4.1 for Windows 2000/XP).
These links and any other searches should help you find what you are looking for.
Regards,
Otis
Training and Certification
Product Support Engineer
National Instruments

FP-PWM-520 - Can the phase relationship between the channels be controlled?

When I change the period of the pulse trains on an FP-PWM-520 module using the Labview FP Write VI the syncronization of the channels changes but in a seemingly random manner. I need to set the 8 channels so that they turn on in a staggered relationship. The order of turn-on can be arbitrary but the spacing should be even.

Hi,
Unfortunatly, there is no mechanism that allows you to control (or synchronize) the phase between channels.
Regards,
Remzi A.

RC Servo control using FP-PWM-520?

I was wondering if anyone has any experience using Labview (7.0) to control a Fieldpoint FP-PWM-520 module to drive small RC aircraft servos? I am a chemist and I am very inexperienced in advanced Labview programming but I am trying to make good use of the equipment I have available. I want to use the servos to automate a remote radiochemical synthesis ( as a syringe driver) I have read that I may need a pulse width of up to 2 ms to drive this servo. This may kill the project right away since the output of the FP-PWM-520 seems to only go up to 1ms. Is that so? Anyway I would also very much appreciate any example code with LV 7.0 that may show this type of control. I apologize for my lack of knowledge in coding. I hope I can sort of reverse engineer someone elses code and learn a few things in the process. Thanks very much for any and all help!
Steve Toorongian

We tried to use a cFP PWM module to drive RC servos and it almost worked. My recollection
is that we could move the servo as required but the turn on and turn off issues killed the idea
for our application. There is no way to control when in the PWM cycle the module turns off
it's output, therefore the final position of the servo (after you turn off the pwm output) could
be anywhere. Subsequently, turning on the pwm would cause it to jump from wherever it
stopped after turn off to the new position.
Our solution was to develop a small microcontroller based pwm driver. This gives us complete
control over the pwm output as well as a bunch of remote I/O points. We multiplex up to
64 of these devices onto a serial port on the fp controller.
If the turn on and turn off issues aren't a problem I can dig out some of our testing .vis. They
are not finished applications, just 'move the servo' kind of things.
The microcontroller driver was developed under contract so I can't offer any of that stuff
without permission. Let me know if that would be of interest.
Matt

PWM-520 low voltage problems

Hi all. I am having a problem with an FP-PWM-520 module and I'm hoping that someone can help.
I have a Fieldpoint system with two FP-PWM-520 modules in positions @7 and @8. The two modules are powered by a dedicated 24V supply. One module works properly but the second module does not output enough voltage to run our equipment (~4-6V per channel at 100% instead of ~24V).
I measured and got 23.96VDC across V and C. I tried swapping the modules to see if it was a problem with the terminals but the problem moved with the module.
Is there a configuration setting that i missed or is the module toast?
Thanks,
Dave

Hi Janell. Thanks for the reply. Here are the clarifications you are looking for.
1. The power supply is connected to the V and C terminals at postion @7 in the Fieldpoint train. The V and C terminals at position @7 are then jumpered to the V and C terminals at position @8. As originally connected, the two PWM modules share the same power supply. This power supply is used exclusively for the two PWM modules.
When I say that I swapped modules it means that I took the two modules and switched their position in the train (ie: the module that was at position @7 was moved to position @8 and the reverse was done with the other module). When I swapped the modules, the low voltage outputs followed the module that I suspect has a problem.
2. I did try isolating the supply to each module. The result was that one module worked properly and the other still put out the low voltages.
3. I will try this in the morning. Is it possible that the PWM modules are interfering with each other?
Thanks,
Dave

FP-PWM-520 Resetting to 0% pulse width

I am trying to use an FP-PWM-520 module to set a voltage output from a PV panel. I am having an issue trying to reset the module to 0% pulse width. I am taking a measurement, using an FP-AI-110 module on the same FP-2000 logger, every 1 second. The VI I have written takes some number of readings, currently set to 10, and then resets the PWM module to 0% pulse width to open the PV module and take a new reading. The VI then recalculates a new pulse width, sends it to the PWM and I resume taking measurements.
Am I wrong in assuming that I can reset, then set the PWM block 2 times in a matter of seconds? Do I need to wait a specific amount of time before I send the reset and new pulse width?
Thanks for your help.
Message Edited by upchuckjunk on 01-15-2008 05:25 PM

I have been using Fieldpoint successfully for data acquisition for 3-4 years now. I am new to the PWM blocks. The code I am running resets the FP-PWM block, writing an array containing eight "0" to the block, then waits for 1 second, reads the FP-AI block. I can post code, but will have to strip out quite a bit from the state machine before I post it. As I stated above, the PWM does not always reset. It seems to reset most of the time, but every 3-4 cycles, it fails to reset the PWM to 0%. I know this because my voltages never reach the maximum values they should.
To reset the blocks, what exactly do I need to do? Do I need to wait a specific time? Do I need to write some specific value to the block? If I get answers to these questions, I know I can figure out what is going on with my code.

Help: Wrong Pulse Width By cFP-PWM-520.

Hallo People:
I want to know, how can I find an Irrtum.
I have ein NI cFP-PWM-520, Pulse Width Modulation Output Module, wenn I put es in my teststand under a bank, wo the another FieldPoint Modules lay, the inpuls width change itself automatic, examples, I figure es in 1000 mS cycle, 50% High Level, after Max. 30 second, on oscillograph the cycle will 2000 mS, the High Level changed too, but by MAX (Measurement & Automation) is es in range, wenn I test es only without another modules, es sei ok too.
Can somebody tell me, how can i just find the right reason, why?
thanks

Ich habe eine Messstation, die meisten Aufgabe sind von Fieldpoint erledigt. Das FieldPoint-System besteht aus cFP-2010, cFP-CB 1, cFP-PWM 520, noch cFP AI 102, die alle sind auf cFP-BP 4 angesteckt.
Vor realem Test die alle werden geprüft, in Ordung. Natürlich nicht ziemlich genau wie im realen Test. Aber es kommt ständig Fehler von den PWM Module, die Signal nicht stabil, die High und Low Pegel schwangkt. Zum Beispiel, ich habe am Anfang bei MAX die Messungsperiod auf 1000 mS gestellt, nach ein paar Sekunden, von Oszilloskop wurde die Messperiod auf 2000 mS feststellt, die Messperiod steht in MAX unverändert.
Aber es scheint momantan nicht Problem mehr, die alle PWM Module müssen zurück schicken um Firmware zu update, aber will ich trotzdem wissen, was passiert, oder nach Vermutung welche Ursache kann es sein.
Ich freue mich sehr, um eure Antwort bekommen.

Using Fieldpoint Explorer, I am having trouble configuring outputs on my RLY-420 and PWM-520 modules attached to an FP-1000 network module

I have noticed that I can not get my Relay module to turn off all of the channels, also I can only set the PWM modules down to ~4% output.
I have tried to "Reset" the factory defaults on the FP-1000. I've tried to configure the powerup states of the different modules, all with no luck.
I have made sure I am running with the latest firmware on the FP-1000
I did notice this problem before upgrading the firmware. Immediately after doing the upgrade the problem went away for a short while. Now it is back again.
My system is configured as follows:
1 FP-1000 network module @address 0
4 FP-TC-120 modules @1,
2, 3, 4
2 FP-TB-10 dual channel bases @ 5, 6
2 FP-PWM-520 modules @ 7, 8
1 FP-RLY-420 module @ 9
Something seems to me to be happening with my .iak file in FieldPoint Explorer, of course I could be completely off base.
I appreciate any insight anybody might have with this problem
Kerry Libberton
TDA Research
Wheat Ridge, CO

Kerry,
There are several different things that may be going on here. First of all, there may be an issue with power consumption. A network module (FP-1000 in this case) is designed to source up to 9 Watts of power to I/O modules. This assumes an average of 1 Watt per module. Certain modules require more than 1 Watt, most require less leaving extra power for the ones that require more. In your configuration, you may be over this depending upon how your FP-TB-10's are populated. Assuming that the TB-10 is unpopulated, your consumption is 4 * 0.35 + 2 * .25 + 2 * 0.6 + 1.7. = 3.8 Watts. Thus, the load from the Dual Channel modules may not exceed 5.2 Watts. If you are using exclusively the Dual Channel Analog Out Current modules, you will overload the power supply.
Anothe
r thing to look at is when resetting the network module, check the box that says factory configuration. After the reset, uncheck the box and then configure your channels and power-up values (edit this device on each module).
Also, there are some times when relays may get "stuck" in an on position due to extremely high inductive loading. I have not seen that happen very frequently, but it does make me wonder, what type of load are you driving on the relay channels?
The PWM module, has 12 bit resolution, and will accept values of 0% for the output duty cycle. What value for the period have you set?

Re: lumia 520 broken screen

i bought a lumia 520 from 02 on the 11/5/13 i had a proble for the first week i couldnt text so i phoned 02 about and the girl said i need to open phone and lean sim card to see if it works i went to open the phone how it shows in the instructions and the screen shattered on me. so i told the girl from 02 what happened and she said i need to go bback to the sotre so i did and there telling me the phone is not covered for a broken screen can you help me?

GROGANGIRL wrote:
I got a Nokia Lumia 520 via Vodafone 6 weeks ago. The other night the screen froze completely and I couldn't do anything, even turn the phone off. I looked online at suggestions and tried to reset the phone, but nothing happened. So I then decided to take out the battery. I followed the online instructions for removing the back, and the screen just shattered. When I went into the Vodafone shop they didn't believe that the phone had crashed before the screen cracked and won't do a free repair. On top of that, I have lost all my contact numbers because they couldn't retrieve them via bluetooth because the phone wasn't working. Apparently with these windows phones the contacts are saved to the phone, not the Sim, so I am now completely stressed out, have lost numbers that have been transferred from phone to phone for over 10 years and have a huge bill to pay. I am not at all happy. The only reason I bought a Nokia was because I have had several others over the years which have been brilliant -this one is definitely not and I think Nokia should be compensating people if this is a common problem.
Your phone contacts are saved to your windows live account, you can go to www.live.com, login with the account that u used on your phone, and export contacts to a file.
Also if you use the same live account on a windows phone, contacts will be restored to the phone
The silence will fall

Cfp-pg-522 to do like cfp-pwm-520

i have a cfp-pg-522 to control a stepper motor and now i want to control a heater just like cfp-pwm-520 ,i don't know how to do that?
i use a cfp-ctr-502 two counter make a pwm function but i found the cfp-ctr-502 pwm only to adjust from 50%~100% or 0~50%?

Hello guqunlin, Thank you for contacting National Instruments. This puluse's duty cycle is limited to discrete values: 50 %, 33 %, 25 %, 20 %, 16.6 % etc.You can refer to the FP-CTR-502 and cFP-CTR-502 Operating Instructions
(http://digital.ni.com/manuals.nsf/websearch/FD58CA0682B21E5B86256D4A0062510A) to find the reasons.
You might want to consider using the (c)FP-PWM-520 which has 12-bit duty cycle resolution (4,096 discreet values from 0 to 100 percent). You could also use the (c)FP-PG-522. This module is limited in the resolution of the duty cycle as well. To set the duty cycle, you specify the on time and off time of the pulse.
Also, you can refer to this link on discussion forums:
http://forums.ni.com/ni/board/message?board.id=170&message.id=91147&requireLogin=False
Message Edited by range on 04-12-2007 03:05 AM
Message Edited by range on 04-12-2007 03:06 AM

4 channel PWM timer/counter needed

Hi,
Can anyone suggest a counter/timer to use as a 4 channel PWM driver? I've got a standalone platform with 4 fluid pumps that I need to control independently via LabVIEW. I need to run it in the field so I cannot use a PCI card and the form factor is important so the PWM-520 module is too big.
I need to run around 4kHz - 20 kHz.
Any suggestions?
Thanks,
Claus Mogensen

Hello Claus,
Since you're not able to use a PCI card or Compact FieldPoint it would be helpful to gather more information about your application before making a product recommendation.
1. What dimensions are acceptable for your application?
2. Do you intend to use these PWM signals as current drivers? If so how much current do you need the device to provide?
3. What form factors are acceptable?
4. What is your controller?
5. Will this setup be deployed in a harsh operating environment? (Excessive shock/vibration, high temperatures, etc.) If so what parameters must it withstand?
The above questions will help narrow down possible solutions, but if you have any other information about your application please feel free to include it as it will only allow for a better recommendation.
Cheers,
Brooks

I have another question related to the connection and operation of FP-RLY-422

1. I use one 25 VDC power to supply power for all the five fieldpoint modules(i.e. V and C terminals of FP-2000, FP-AI-110, FP-AO-200 and FP-RLY-422 are connected) However, as cascading power from neighboring bases or network modules defeats isolation between cascaded modules. I want to know whether the switching of one channel of a module have influence on the reading or switching of other channels in other modules. May I need to provide seperate power supply for FP-2000, FP-AI-100, FP-AO-200, and FP-RLY-422. If FP-RLY-422 was suppled by power of 120 VAC. Is it OK. I read the manual of FP-RLY-422 which specifies 3 A at 35 VDC or 250 VAC. If I used it to control three heaters of 500 w each and
another 750 W. The current of each channel will be over 3 A. Can it be wired in this way?
2. I use FP-RLY-422 to control four heaters. Now I connected it in this way. I connect it firstly to one of four solid state relays for each channel of the fieldpoint relay. The solid state relay is just a open/close relay the input is 3-32VDC and the output is 110-220VAC/25 A or 240 VAC/50 A. In this case, I build the VI for the operation of heater just in two statuses i.e. on and off. In this case the temperature can't be controlled very accurately. I want to know whether I can build a VI based on PID control based on the present wiring of my cable (i.e. fieldpoint relay control on/off solid relay to control operation of heater indiretly). In this case may I wire the fieldpoint relay FP-RLY-422 directly to the heater of 750 W? I understand the fieldpoint relay FP-RLY-422 in this way. It is a mechanical relay and I can heard the sound when it switched between normally open and normally closed.
I think it have only two statuses i.e. on and off. In this case would you please explain how it contrl the output for the heater more accurately. Does it control by regulating the time being on/off?

Bo,
1a) All FieldPoint I/O modules are supplied operating power from the power supply in the network module. Certain modules may require additional power for sourcing power via outputs or inputs. Of the modules you list above, the following module requires external power; FP-AO-200. The following modules do not require external power wired to the V & C terminals; FP-AI-100, FP-AI-110, FP-TC-120, and FP-RLY-422. The V & C terminals are provided on modules that do not require them to simplify wiring (e.g. not requiring external terminal blocks if you have loop powered current transmitters).
1b) The FP-RLY-422 is rated for up to 3 amps at 35 VDC or 250 VAC. Currents above 3 Amps may damage the relays, the traces on the terminal base and FP-RLY-422 PWBs, and wi
ll cause overheating of the connectoer between the terminal base and the I/O module.
2a) You can use the FP-RLY-422 with a PID control algorithm to control the heater. However, as relays have limited life expectancies and are simply on/off the control will not be a fine as some other options. What may be better is to use a FP-PWM-520 pulse width module to control the solid state relays. You still control the solid state relay via on/off, but in this case, the on/off time can be occuring relatively quickly, and you change the amount of on time vs the amount of off time, to control the power going in to the heater.
Regards,
Aaron

Why can't I get a PID to tune without having an offset from setpoint?

I am using the basic PID algorithm supplied in the PID toolkit and after calculating the terms as described in the manual, my system controls quite well. However, there is about a 2-3 degree offset below setpoint on my heater.
I am just starting to use the toolkit and have it controlling a small heater on a piece of tubing, with a thermocouple on the inside wall.
I have turned up the proportional gain and gotten the offset to get smaller, as well as increasing the integral action. Ultimately the system has such high gains that it becomes unstable and begins oscillating wildly.
I have tried to leave the system alone for a long period of time and the integral term never seems t
o push the temperature the last little bit to the setpoint.
Is there anybody familiar with the toolkit and PID algorithms who could make suggestions about what I might try to get something a little better?
I am using Fieldpoint TC-120 modules to read the temperature and controlling the heater with a PWM-520 module. I have the duty cycle of the PWM module set to 1000 ms, and am running the PID loop at 500 ms. (maybe that is affecting my control)
Thank you for your help
Kerry Libberton
TDA Research
Wheat Ridge CO

Hi,
I have encountered the same phenomenon.
Increasing the derivative action seems to dynamize the system so it will
reach the setpoint.
It is still strange to me, since all temperature controllers I use don't
need any derivative action.
Regards,
gagir
"KerryLib" wrote in message
news:[email protected]..
> I am using the basic PID algorithm supplied in the PID toolkit and
> after calculating the terms as described in the manual, my system
> controls quite well. However, there is about a 2-3 degree offset
> below setpoint on my heater.
>
> I am just starting to use the toolkit and have it controlling a small
> heater on a piece of tubing, with a thermocouple on the inside wall.
>
> I have turned up the proportional gain an
d gotten the offset to get
> smaller, as well as increasing the integral action. Ultimately the
> system has such high gains that it becomes unstable and begins
> oscillating wildly.
>
> I have tried to leave the system alone for a long period of time and
> the integral term never seems to push the temperature the last little
> bit to the setpoint.
>
> Is there anybody familiar with the toolkit and PID algorithms who
> could make suggestions about what I might try to get something a
> little better?
>
> I am using Fieldpoint TC-120 modules to read the temperature and
> controlling the heater with a PWM-520 module. I have the duty cycle
> of the PWM module set to 1000 ms, and am running the PID loop at 500
> ms. (maybe that is affecting my control)
>
> Thank you for your help
>
> Kerry Libberton
> TDA Research
> Wheat Ridge CO

Does field point have pulse train output greater than 50KHz

I am trying to develop a flexiable simulator using NI Field Point. So far my only concern is producing a pulse train of around 500KHz. Is there a way to do this with field points counter moudles or with some other methodology

There are currently no FieldPoint IO modules that output greater than 16 kHz. Specifically, the following modules can output at the listed maximum frequencies:
FP-CTR-500: 16 kHz
FP-CTR-502: 16 kHz
FP-PWM-520: 1 kHz
FP-PG-522: 2 kHz
You could use some external signal generation circuitry that is controlled by the FieldPoint modules, but the FieldPoint modules themselves can not handle that speed.
Regards,
Aaron

I am using field point to replacement plc, i need to control stepper motor by using field point, what module should i buy and how to control it?

Can i use FP-PG-522 or FP-PWM-520 to control the stepper motor.

Cheeking,
I think Aaron has answered this query at: http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500000008000000E16E0000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
Pravin

Is my PWM-520 broken?

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