Hi,
I am working on some registration controls on a printing press where we use an inductive proximity sensor to detect metal targets on a rotary screen coating station. The targets are mounted on an end-ring that holds the screen and has a gear that allows us to drive it. In the following...
Hi,
I am preparing to replace a control panel for an industrial machine. The new control panel is a direct replacement for the old control panel that has been in use for nearly 30 years - it just has new components that are still supported, whereas the old control panel has many unsupported...
Hi,
I am trying to troubleshoot a DC Motor and Drive Control System on a Printing Press. This is a 10 HP DC Motor with a field winding. It is controlled by a Cleveland MachineControls (CMC) PM3 drive. The speed reference to the drive comes from a digital potentiometer. Control is open-loop...
Hi,
I work with continuous web handling equipment on which I use sensors to detect features on a moving web. The feature I want to detect can be gaps between labels, a registration mark, or defects. Regardless of the sensor technology (photosensor, laser, ultrasonic, etc), they usually have...
Hi,
I have a label inspection machine that makes use of Tri-Tronics Label-Eye LERC label sensor. This machine processes a continuous series of labels that are adhered to a backing material. The sensor detects the gaps between each label. This is a "fork" style sensor that requires the labels...
Hi,
I have a three phase resistance heater as shown in the attached diagram.
I know the formula for power is P = I * E * 1.732. Based on the information shown, this comes to P = 22.6 * 480 * 1.732 = 17,789 watts. This is pretty close to the 18,650 watts shown on the diagram, so this...
Hi,
I am going to be using a control panel door mounted disconnect for which the handle looks like this ...
... This handle is constructed so that it will rotate 90 degrees clock-wise from the OFF position to the ON position. It seems this will allow me to mount this in a few different...
Hi,
I have been trying to design an Industrial Control Panel that complies with the guidelines in UL508A. I am up to the point where I am choosing wire colors for the internal wiring in my panel. As my control panel will be used with industrial machinery, I am looking at the section of UL508A...
Hi,
I have been trying to design an Industrial Control Panel following the guidelines in UL508A. I have asked several questions related to this project, and members in this forum have been incredibly helpful. I am now at the point where I have ordered all my components, and now I am trying to...
Hi,
I have an application in which I will be using a solid-state relay with a closed-loop temperature controller to regulate the power to a resistance heater. The voltage will be 208 VAC single phase and the heater resistance will be 7.2 ohms, so the expected current is 28.9 amps when the...
Hi,
I have been studying NFPA 79 with my goal being to understand the conductor sizing requirements for an Industrial Control Panel. I understand that in the USA, this might also be governed by UL508A, but at the moment, I am just trying to understand NFPA 79.
I am having a hard time...
Hi,
I am trying to design an Industrial Control Panel that can be a drop-in replacement for an existing control panel that has been in service in a machine control application since the 1990's. The existing control panel (and the machine it controls) still works, but many of the the components...
Hi,
I am trying to design an Industrial Control Panel that will replace an older Control Panel that is currently being used in a machine control application. I have posted a several questions related to this project, and the responses I have received have been incredibly helpful. If everyone...
Hi,
I am trying to design an Industrial Control Panel that will replace an older Control Panel that is currently being used in a machine control application. I have posted a few questions related to this project, but I thought this topic is different enough that it might be worthy of its own...
Hi,
I am trying to design an Industrial Control Panel that can be a drop-in replacement for an existing control panel that has been in service in a machine control application since the 1990's. The existing control panel (and the machine it controls) still works, but many of the the components...
Hi,
I am designing a control panel for machine control. I will be including a disconnect to which a supply power circuit (208 VAC 3 phase 80 amps) will be wired to. When the disconnect is turned on, 208 VAC will be distributed to the following components:
[ol 1]
transformer (208 VAC to 120...
Hi,
The attached electrical schematic shows a proximity switch wired into a PLC input module. It shows a 1.5K ohm resistor and two of what I believe to be TVS (transient voltage suppression) diodes labeled 26 vdc. I am not certain of this because I was not familiar with this symbol prior to...
Hi,
I have a machine control system in which I have multiple control components connected via cat 6 cable to one of two ethernet switches (I'll call these switch #1 and switch #2). Switch #1 and Switch #2 are connected to one another by cat 6 cable as well. All control components are on the...
Hi,
I am trying to find a potentiometer with the following specifications:
10 turn
Has a "counting dial" that indicates how many full rotations it has been turned
Mounts in a 22 mm diameter hole
Range 100 ohm to 100k ohm
Screw terminals rather than solder terminals
The closest I have found...
Hi,
I have a 10 HP AC motor with nameplate 1750 RPM. This motor is being used for tension control in a winder application. The motor is controlled by a variable frequency drive that is configured for torque control mode. I can send the drive a 0-20 mA signal to vary the torque between 0-100%...
