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Messages - george1

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1
Technical support / Re: Capacitors blowing
« on: July 20, 2003, 09:25:59 AM »
Hi,
  Thank you for the response.  The capacitor that  I added.  The PLC is fine.  The capacitor that  I added is a 50volt  and 470 uF.  I was monitoring the PLC and I had found out as the PLC is warming up its fine.  Once it comes up to 24 volts then Pow the capacitor blows.  I added the capacitor as a safety as the manufacturer recommended.   Do you think I need a bigger capacitor and what kind?  Or I might be using the wrong capacitor.  I think it is the voltage spikes causing it.  I rather the capacitor take care of any spikes then the PLC.  But so far the plc is working fine.  
thank you so much
john

2
Technical support / Capacitors blowing
« on: July 17, 2003, 11:38:59 AM »
Hi,
  I had finished putting together a panel for demo for my customers.  Everytime I turn on the power to the PLC within 5 seconds the capacitor would blow.  I hooked upthe capacitor and diode prior to the input as recommended in the manual.  What I did also, I disconnected the panel all together and just hooked up the power supply only to the PLC. IT still blew the capacitor.  I wonder is it the Battery source.  I am using a 24 volt and 3.5 amp power supply.  So, far I have blown 4 capacitors and i am very baffled.
thank you so much
john

3
Technical support / Re: Servo motor
« on: July 21, 2003, 08:49:31 PM »
thank you so much for the clarification

4
Technical support / Servo motor
« on: July 21, 2003, 07:55:53 AM »
Hi,
   I was recently talking to several servo motor manufacturers.  They both told me I can communicate with their amplifier or controller if my plc can put out 10 volts and/or communicate through RS 485.  Now the voltage through the RS 485 should be also 10 volts powering it?

Also,  how do I communicate through the RS485? Do I make a custom funcition by including the command functions readmos, writebus and print.

Also, do i need to connect my plc to the modem of the computer to be able to communicate through the internet or just by connecting to the RS 232 port is enough?
thank you so much
john

5
Technical support / Re: Error Opening file over the internet
« on: July 22, 2003, 09:12:55 AM »
Hi,
  I found out that i had to save the program in TLserver, now everything works fine
thank you
john

6
Technical support / Error Opening file over the internet
« on: July 21, 2003, 09:14:00 PM »
Hi,
  I was trying to communicate with my plc. I go through the routine.  I put the dialmodem custom function in my routing.  I download the program into my plc.  I type in the internet address. In fact I typed each of the three available addresses.  I put in my password and I get through. I get a screen that says untitled.pc5.  next step i try to do online monitoring then I get an error opening file and says file not found.  It locates the the filename which I named dialmodemtest and asks me if i want to open it on tlserver and I said yes then I get that error message.  I feel so close but yet so far :-/

7
Technical support / Re: stepper motor heating up
« on: July 22, 2003, 04:27:11 PM »
oh I do apologize for not being clear.  I meant my driver signals operate on 5 volts and my stepper operates on 24 volts.  I have to be more clear next time
thank you so much
john

8
Technical support / Re: stepper motor heating up
« on: July 22, 2003, 09:11:20 AM »
Hi,
  I found out that I have to reduce the current to the stepper and also steppers run hot anyways,

thank you so much
john

9
Technical support / stepper motor heating up
« on: July 21, 2003, 09:03:53 PM »
Hi,
   My stepper motor started to heat up as I had power to it.  I was wondering if I did not use high enough resister to reduce the 24 volts down to 5 volts. I used 1.9k and I think you recommended to use 2.2k.  Other than that the stepper motor and plc works fine.
thank you so much john

10
Technical support / Re: dc motor wont stop running in setpwm
« on: July 25, 2003, 11:11:04 AM »
Hi
  thank you so much for the clarification.  

11
Technical support / Re: dc motor wont stop running in setpwm
« on: July 24, 2003, 07:28:12 AM »
Hi,
  Thank you for the clarification :)  
Also, I am getting a zero reading on the frequency.  I am a getting a reading on the pulsewidth and pulseperiod. I am getting large astronomical numbers on those two readings like 3276800 and 6553600.   I want to incorporate it in my close loop.  I think I would need the frequency to do that.
thank you so much

12
Technical support / Re: dc motor wont stop running in setpwm
« on: July 23, 2003, 01:09:13 PM »
Hi,
  Yes, I mean I turn on a switch which I have on a board which is connected to a wire going into input 1.  Also, I have a wire between output 8 of the plc and the motor.  As I turn on the switch , the motor is running. As I turn off the switch the motor keeps on running.  I had set the output 8 for pwm to offer higher current.  
Also, I was trying to do a feedback loop.  But the frequencies dont show up even though I set A = pulsefrequency (1).  It shows zero.  The pulswidth and pulseperiod showup something like 327,564 and 654,594.  Some high figures like that.  I was trying to do a close loop to show my customers how to DC motor control.
than you so much
john

13
Technical support / dc motor wont stop running in setpwm
« on: July 22, 2003, 04:34:32 PM »
Hi,
  I used the pwm modulation channel to run a dc motor. Turn on the switch and the motor goes on.  I turn off the switch the motor keeps on going.  It is acting as if it is latching.  There was no way of me turning the motor off without turning off the PLC or hit the reset button on the online monitoring system.

Also another scenario, since this motor does not consume much current I was able to turn it on and off using just an ordinary I/O.  But, when I tried to turn it on and off through the online monitoring system it would not turn on but you would hear a little thump as if not enough current.  If you do it manually it works  

14
Technical support / darlington transistor is not functioning
« on: August 01, 2003, 09:06:38 AM »
hi,
  I have a 24 volt dc motor with a  5 volt encoder.  i supplied 5 volts to the encoder through the analog 5volts supply .  I get a 5 volt pulse, then I hook it up to a darlington transistor ULN2003 as it was described in the manual.  Now I only get .649 volts.  Is there I skipped over in the manual  in the manual that was left out?  
I tried several transistors and the same results.  So I assume I hooked it up wrong

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