I have done the searches and the closest to what I was looking for was here- Low-pass Filter . But still no help.
My case-
About a year ago I built a control panel for a new automated manufacturing machine that has a 150W switching 24VDC power supply(DC Control wiring), D2-205 (260cpu)Plc with 64 (NPN) Inputs and 48(PNP) Outputs, all ac loads are switched via relays with DC coils, and a Cmore micro 6" Touch Screen HMI. It also has Danaher S300 Servo controller/driver within the same panel. The panel is powered by 240 3phase ac. All three phases go directly to a contactor (DC control to A1 and A2) and then to the VAC input of the Servo controler. L1 and L2 are tapped to the primary of a step-down transformer for the 120Vac Secondary as the power source for the DC power supply. I have a Cutler Hammer Powerline filter (5A) on this 120VAC prior to any devices, and all loads are switched via relay contact thru-put to loades external to the panel.
Problem-
The machine has work beautifuly as designed with only one glitch. After a few hrs of run time after the machine is turned on, the HMI stops responding on the touch screen. I can manually bring up the calibration screen via pressing F1 & F5 but there is no response the the touch panel area. I have contacted both AutomationDirect and Danaher and have been advised to find a better Filter for the box. To verify if there was a filter needed, I put an oscilloscope on the DC line. On power-up, the DC line is pure and clean at 24.4vdc. Only after the Servo controller has gone through it's selfcheck and then enables, I discover a 16KHz 2V (peak-to-peak) riding on this 24vcd signal. I have segregated all ac and dc lines the best I can. All DC conductors are shielded twisted pair with a solid neutral and earth ground using the back plate as the common ground conductor plate. When the servo motor is commanded to move (Position Control mode) this AC frequency spikes to about 5 to 6 Volts Ac peak-to-peak.
Danaher agree's that the controller is clocking the motor a 16KHz. While tuning the motor, I had to up some of the gains in order to get to position (56" ball-screw).
My research for a filter to drop out this ac fequency has not been fruitful. I am thinking of building a TEE-Form Butterworth 3 pole (L-C-L) filter myself to see if I could get a little more frequency specific.
Has anyone attempted the before?
Has anyone run into this same issue?
Or..., am I just shooting myself in the foot?
Thanks for anyone with a bit of advice.
My case-
About a year ago I built a control panel for a new automated manufacturing machine that has a 150W switching 24VDC power supply(DC Control wiring), D2-205 (260cpu)Plc with 64 (NPN) Inputs and 48(PNP) Outputs, all ac loads are switched via relays with DC coils, and a Cmore micro 6" Touch Screen HMI. It also has Danaher S300 Servo controller/driver within the same panel. The panel is powered by 240 3phase ac. All three phases go directly to a contactor (DC control to A1 and A2) and then to the VAC input of the Servo controler. L1 and L2 are tapped to the primary of a step-down transformer for the 120Vac Secondary as the power source for the DC power supply. I have a Cutler Hammer Powerline filter (5A) on this 120VAC prior to any devices, and all loads are switched via relay contact thru-put to loades external to the panel.
Problem-
The machine has work beautifuly as designed with only one glitch. After a few hrs of run time after the machine is turned on, the HMI stops responding on the touch screen. I can manually bring up the calibration screen via pressing F1 & F5 but there is no response the the touch panel area. I have contacted both AutomationDirect and Danaher and have been advised to find a better Filter for the box. To verify if there was a filter needed, I put an oscilloscope on the DC line. On power-up, the DC line is pure and clean at 24.4vdc. Only after the Servo controller has gone through it's selfcheck and then enables, I discover a 16KHz 2V (peak-to-peak) riding on this 24vcd signal. I have segregated all ac and dc lines the best I can. All DC conductors are shielded twisted pair with a solid neutral and earth ground using the back plate as the common ground conductor plate. When the servo motor is commanded to move (Position Control mode) this AC frequency spikes to about 5 to 6 Volts Ac peak-to-peak.
Danaher agree's that the controller is clocking the motor a 16KHz. While tuning the motor, I had to up some of the gains in order to get to position (56" ball-screw).
My research for a filter to drop out this ac fequency has not been fruitful. I am thinking of building a TEE-Form Butterworth 3 pole (L-C-L) filter myself to see if I could get a little more frequency specific.
Has anyone attempted the before?
Has anyone run into this same issue?
Or..., am I just shooting myself in the foot?
Thanks for anyone with a bit of advice.