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26-04-2019 #1
sorry i have not been back in touch my internet was canceled and i have just got it back up and running.
the voltage is of my Arduino which is 5v but i have heard that if you run the Mega you can use 12v
again my apologies for not getting back to you when you was kind enough to answer. not me at all
ps the vfd is plugged into a five way adaptor the long type
Again thanksLast edited by Slasher102; 26-04-2019 at 10:56 AM.
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26-04-2019 #2
The motors, spindle, and VFD all put out quite strong and varying magnetic fields, which induce small voltages in the cables around them. The VFD can also pump electrical noise back into the mains supply, which can also cause problems.
As magicminer says, you can use shielded twisted pair cable for your E-Stop line which should help to reduce the influence of the inducted noise.
Magicminers other suggestion was to put more cable distance between the VFD and the control system power supply, which will slowly attenuate the noise. A 5-way plug doesn't really do anything - its cable length, and if possible filtering, that will impact this.
At the moment, your signal is probably on (2.5V-5V) or off (0-2.5V) - meaning the noise only has to be ~ 2.5V to cause major headaches. If you increase the voltage on this line to 12V, the noise has to be on the order of 6V to cause the same problems. If you have an oscilloscope, you could measure what the level of noise is.
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27-04-2019 #3
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26-04-2019 #4
Hmmm, Mega = Arduino Mega?, based on the AT MEGA 2560 MCU, still runs at 5V, but the on board regulator will provide the 5V required by the MCU. The I/O remains, however at 5V. AndyUK touches on ways to improve noise immunity, but with an Arduino-based system (and 5V logic) your best bet is to use opto-coupled inputs with a 12V (plus) input drive system onto the optos. The Arduino as-is is likely to be susceptible to noise.
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