We have a problem with capacitor failures in the field.
Some key information:
* The problem occurs at 220V 50/hz locations. No complaints at 120V/60Hz locations. (different manufacturers for 50hz vs 60Hz motor).
* This is happening at a number of sites.
* Failures occur after running about a...
Is it acceptable to use an IP65 CE rated HMI (24VDC) with a stainless steel enclosure (NAME 4X) in a UL listed product? If so, what needs to be considered in order for this combination to pass muster with UL?
We have a product with a PLC that we are considering for UL listing. There are a number of industrial pressure sensors with 1-5V outputs powered from a fused 24VDC supply. Do we need to use UL registered sensors in order for the products controls system to be listed?
We have a 460VAC 3 Phase DC power supply in a design that has internal fuses protecting the line inputs. We have a 20A D characteristic breaker on the incoming power. Additionally, we have 3A fuses external to the power supply. The installation instructions for the supply state the following...
We are hiring some new employees to do machine wiring and electrical enclosure assembly, as well as, machine testing and troubleshooting. I am looking for ideas to send to our production manager for outside training. The topics would include wiring and cable assemblies, control boxes...
I am using a Rockwell Micro 820 configured as a Modbus-RTU slave device.
Is there a way for the user to change the slave address without giving him access to the application code?
We have a customer in the oil and gas industry that wants us to provide our equipment with
“WITSML Communications Protocol via RJ-45 port". Our equipment is controlled by an Allan Bradley Micrologix 1400 PLC with a Modbus port. What is necessary to provide the WITSML protocol that the customer...
We have a customer in the oil and gas business that wants us to provide our equipment with
“WITSML Communications Protocol via RJ-45 port" I did some research to determine that WITSML is an XML based protocol and assume that RJ45 port is an Ethernet port. Does anyone have experience...
I need to justify adding the cost of line reactors to a product we are developing that uses a VFD and have a few questions that I'm sure are going to come up.
Note: Our machine requires a dedicated branch circuit.
1. Under what conditions is it suitable to NOT include a line reactor (and it's...
This topic came up recently in house.
What are the pros and cons of updating the hardware revision whenever a change in the software occurs?
Is it better to manage the revisions separately? If so, how do you link these changes in your engineering change process?
We have a system that uses 115 VAC for power, valves, etc. We want to allow it to run from 230V or 115V with the same model. What is the best way to do this?
I have an HMI on a peice of equipment that routinely crashes (at least once per day) whenever the Ehternet cable is plugged in. I suspect noise from nearly equipment is corrupting the WinCE based HMI. Are there any strategies for reducing the noise coming into an ethernet port? I breifly...
I have been tasked with designing a touch panel HMI into a product. The product must be able to run unattended 24/7/365. I know alot of HMI's are built on a windows CE platform, and we all know how often applications on windows machines tend to work better in some places than others.
My...
I have a situation where we have 3 peices of identical equipment in the same room, which has 13.6KV feeds going into the room. All 3 peices of equipment worked fine, until they added a 2nd feed, then one of the units started experiencing intermittant program errors (even though it was not being...
I am using a PLC to control the temperature in a vessal. I am looking for opinions on using the same PLC for controlling the temperature, as well as, monitoring and protecting against over-temperature.
I have seen this done 2 ways.
1. Use the PLC to control the heater contactor, and use a...
I've read the followiong caution on a few commercial power line monitors.
"Caution: Do not install this ddvice on any outlet that does NOT have at least 10 meters of wire between the electrical outlet and the electrical service panel"
Can someone explain the reasoning behind this caution?
We have a customer that wants to put our 230V equipment consisting of a compressor and some 3 phase ac motors into his 208V (200V to 220V) system. The system consists of our equipment and some 3 phase and 2 phase servo motor circuits, as well as, some ac motors, all running off of a single...
