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121
Technical support / Re:Motor control
« on: October 02, 2010, 08:33:01 AM »
Seems like Online monitoring is also not working when the controller is activated. Will putting a noise filter at the incoming ac to the power supply helps?

Happy Weekend

122
Technical support / Re:Motor control
« on: October 01, 2010, 09:40:06 AM »
Hi. What are the things I need to do to take care of the noise from the controller? Basically, when I take away everything and only connect the earth of the controller and earth of power supply together, excel link still fails when I activate the controller. Why?

123
Technical support / Re:Motor control
« on: October 01, 2010, 05:25:27 AM »
Hi. Thanks for the advice. Solved the problem. Turn out that the controller is not grounded. Thought connected to PE is same as grounding. But excel link is still not working due to noise I think. Will try out the diode and capacitor as mentioned in the manual

124
Technical support / Re:Motor control
« on: September 30, 2010, 03:03:10 AM »
Had tried using LM324 but the output is still the same. When I activate the controller and setdac 1,0, there is still a voltage of 0.3vdc between the pin. When I setdac 1,200, the output is 0.5vdc. However, the output drops back to 0.2vdc when I deactivate the controller. Any idea? It is also this problem that is making the excel link to have problem. Will connecting the 0vdc of the controller with 0vdc of the analogue helps?

125
Technical support / Re:ExcelLink
« on: September 29, 2010, 08:41:59 AM »
Hi. Will using LM324 as mentioned in the other post help in reducing the noise?

126
Technical support / Re:Signal Reading
« on: September 28, 2010, 07:57:00 PM »
Hi. I've seen the diagram on using the UN2003A. Just want to make sure something. Do I connect the 0V from the encoder output, pin 8 and PLC 0V together even though the encoder is drawing from it's own power supply while the PLC is drawing from another power supply?

Thank you.

127
Technical support / Re:ExcelLink
« on: September 28, 2010, 07:40:54 PM »
Hi. When trying to communicate with the PLC when it's not connected to a motor controller works fine. However, when the analogue output of the PLC is connected to the input port of the motor controller, Excel Link is showing the following randomly:

1) CommException A1 received a corrupted response string from S1

2) Javalang ArrayIndex Out of Bounds Exception 16 in S1

What does all these mean? How can I ensure no breakdown in the communication between the PLC and Excel Link? Not good to be unable to control the PLC when it's in operation. Thank you for your help

128
Technical support / Re:Motor control
« on: September 28, 2010, 07:36:11 PM »
hi. The resistance of the analogue input of the motor controller is 30KW. Will the use of LM324 be useful to output the correct voltage from the PLC to the controller in this case? What should be connected to pin 4 and pin 11 of the LM324?

Thank you

129
Technical support / Re:Motor control
« on: September 23, 2010, 09:27:44 AM »
Is there any diagram as to how to use the LM324? Sorry it may sound lIke spoon feeding but I'm not too good at electronics. Thank you

130
Technical support / Re:ExcelLink
« on: September 23, 2010, 09:22:59 AM »
Although the communication is good, but the updating of the excel sheet is not that smooth. Any idea how to make it smooth and instant? Thanks

131
Technical support / Re:Signal Reading
« on: September 23, 2010, 07:08:20 AM »
Hi. Actually I'm trying to determine the number of revolutions by using the A and B signal from a 5v encoder. Can 888 determine the number of revolution using the signal? Thank you

132
Technical support / Re:Trashed Analogue Input
« on: September 23, 2010, 06:30:58 AM »
Sorry hi-jack this post for a while. If I have a device that output 0-10vdc analogue output, how do I prevent it from killing the plc while at same time able to read the analogue signal?

133
Technical support / Re:ExcelLink
« on: September 23, 2010, 06:24:44 AM »
Hi. Excellink seems to be delayed when I run it through USB to 232 cable. The sample program is showing 10,11, pause a while, then jump to 18 when it's supposed to read the plc constantly. Is it the cable problem? Will excellink be more reactive if I change to communicate via 485? I'm thinking of using excel and excel to act as an Hmi for a machine but the slow response and inconsistancy is scaring me. Is it possible to solve the problem?

Thank you.

134
Technical support / Re:Motor control
« on: September 23, 2010, 06:18:53 AM »
Hi. When I setdac 1,200, I'm getting 0.2 vdc. However, upon closing a jumper to start the controller, the voltage jumped to 0.6vdc. Any workaround for this problem?

Thank you

135
Technical support / Motor control
« on: September 21, 2010, 09:27:34 AM »
Hi. I'm trying to use a MD888 to give a DAC signal to a motor driver in order to control the speed of the motor. After I've connected dac 1 and 0vdc from the analogue IO port to the motor driver, the motor start turning by itself even though the power to the 888 is not even switched on. The voltage across the 2 pin is 0vdc. Is it a problem with 888 or with the motor driver? How can I make the 2 work together? Thank you

Regards

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