Recent content by SheffSimon

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    Requirements for E-Stops on machinery

    The only requirement is to carry out a risk assessment. If this is equipment in your place of work, PUWER regulations are the most applicable, and are the HSE's tool of choice for prosecution. Carrying out a risk assessment in line with BS12100 is your first step to identifying what, if any...
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    Motor Controls Challenge

    Challenge 1, what's the light bulb got to do with anything? Does it just indicate low pressure? Seems like the challenge is to control air pressure with a fan, in which case connect a pressure transmitter into the motor controller, and use a PID function in the motor controller to control the...
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    Name of Device being used?

    It's most certainly a solenoid valve, but not necessarily pneumatic.
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    Boiler emergency e-stop

    Whats the reason behind wanting some estop pushbuttons? If there is a genuine need highlighted by a risk assessment, then a method of removing the power from the boiler by means of a contactor might be suitable, or an emergency gas shut off valve. The design requirements all depend on the level...
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    How to become an Electrical Design Engineer?

    What area of electrical engineering are you aiming for? Cos it's a very broad field. Automation software Control panel design Building services To name a few....what sort of electrician are you? Domestic? Industrial? My own field is automation, specifically SCADA, DCS and PLC software. I got...
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    Need help building specific Motor Control Circuit

    Is this an industrial/commercial project or just a thing for your own use? Either way, either relay logic or a micro PLC or Arduino or Raspberry pi.
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    What do I need to know to calculate size of single phase motor?

    Can't read that, but how old is the motor? A VFD will put a lot more stress on the motor windings and an old motor with old insulation will not like it. Note also that a VFD running from a single phase supply provides 230VAC 3 phase not 415, at 50Hz. Which is fine if your motor is wound and can...
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    Am i allowed to Install an Electric Gate?

    This is it in a nutshell OP. All the laws and standards are not there to make life awkward, they are there to stop people being killed or maimed. Unless you know what you're doing, can demonstrate you know what you're doing and can demonstrate that you've done it correctly, to the HSE, walk away.
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    Am i allowed to Install an Electric Gate?

    A "fully qualified" electrician, whatever that is, is unlikely to have the knowledge or experience to determine what safety devices are required, how to install them or what they should do if actuated. Equally importantly, producing the appropriate documentation. The powered gate will likely...
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    Speed change

    Where does the speed setpoint for each drive come from? PLC? Operator controls? Internal drive parameter? Any load sharing functionality in the drive? Hard to see how any relatively minor change in supply voltage to the drive would affect the output, VFDs dont work like that.
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    Electrical engineering. HND vs Degree

    As always, it depends on your experience as well as your education, and just being lucky to drop on the right role. I'm assuming you want a technical role rather than managerial. If you had factory or process automation experience, then software engineering is very lucrative, especially if you...
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    Speed change

    All on one VFD or a VFD per motor?
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    Industrial Dough Mixer (Kemper SP125)

    Not familiar with the mechanical design of the specific machines in your factory, but what have you done in terms of a risk assessment for the operation of your machines? If there is an accident and you can't provide satisfactory evidence of your risk assessment process which guided your design...
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    Hoist Brake Coil Problem

    Just for your info, there's a version of 60204 applicable to hoisting machines 60204-32. Other than that, it's 12100 risk assessment and then 13849 or 62061 for functional safety. As you say, needs some thought and considered design.
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    Relay switching max voltage across contacts

    Somebody is presumably paying for your professional expertise and you suggest that hoping 400V won't harm the contacts is a design option, despite the manufacturers data sheet telling you otherwise. Hard to believe when the correct solution is easy and cheap to implement.

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