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...
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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...
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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...
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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...
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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%...
Hi,
I have been working on a few different glue melting tanks. I have two tanks of what seems to be an identical design. Each tank is of the same dimensions and has four seemingly identical resistance heating elements (physically and electrically) that are in the same locations in each tank...
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I am trying to troubleshoot a machine that has a blower with a single phase motor. The manufacturer of this machine sent us this blower as a replacement for a different one that had worked fine for quite some time, but then failed. The nameplate and wiring diagram for the new blower are...
