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  1. Rocboni

    So what’s the script with these AFFDs?

    I was at an 18th edition seminar last week run by Hager, Hager have developed a 2’module afdd in partnership with Schneider, it incorporates an McB and must be used for all final circuits obviously you need an RCD in many applications so I can only see this done with an upfront RCD...
  2. Rocboni

    Closed loop Sensor monitoring

    I suppose it would shut the plant down if one barrier was used and you could just have one explosion vent indicator and they would have to walk round to see what one, no big deal just handy if they can indicate what one from the panel.
  3. Rocboni

    Closed loop Sensor monitoring

    Not when they are on the top floor and there’s a few of them. The main reason is to shut the elevator down. Traditionally no sensors were used and they were a paper like membrane, now they are stainless. Specifically this would be on an bucket elevator carrying grain, which have extraction to...
  4. Rocboni

    Closed loop Sensor monitoring

    Yes I noticed some has sil ratings in the spec. I guess what I was asking was is there any situation where a standard relay would be sufficient bearing in mind these are high leve, I have used a safety relay in the past but thinking larger scale where there are multple elevators each would...
  5. Rocboni

    Closed loop Sensor monitoring

    A “safety device” as in a safety relay? The use of switch amplifiers is required when a intrinsically safe system is required, I cannot see the point of a instricically safe device being used when nothing else is rated for zone 2 and the fact that sensor is not actually in the zone, I would...
  6. Rocboni

    Closed loop Sensor monitoring

    Yes Rob, can this be done with a standard relay held closed?
  7. Rocboni

    Closed loop Sensor monitoring

    Always liked Michael Caine
  8. Rocboni

    Closed loop Sensor monitoring

    Hello, How are closed loop sensors like the below and monitored integrated into a control system, isolation switches/switch amplifiers? These are typically used on explosion panels where when they blow off it snaps the cable or ceramic plate causing an open circuit. (I’m Prepared for the...
  9. 255242C9-6AF0-4FC7-95A7-5B2579C66D71.jpeg

    255242C9-6AF0-4FC7-95A7-5B2579C66D71.jpeg

    • Rocboni
    • Media item
    • Comments: 0
    • Category: Professional Electrician
  10. 0AA69124-8BFC-48B4-B4A1-1DB4411E277E.jpeg

    0AA69124-8BFC-48B4-B4A1-1DB4411E277E.jpeg

    • Rocboni
    • Media item
    • Comments: 0
    • Category: Professional Electrician
  11. Rocboni

    Fairford synergy soft start unit

    I just copied and pasted from the datasheet, no I don’t do work in the US, in a previous life I used to do a fair bit of product design, most of which eventually went on to be sold in the US so it involved having our products UL approved, it was an absolute nightmare getting the stuff through!
  12. Rocboni

    Fairford synergy soft start unit

    Going to go with 3 x Ferraz Shawmutt - 125A High Speed URD 22 x 58mm Semiconductor Fuse 621 CP URD 22.58 125 (A 220708)
  13. Rocboni

    Fairford synergy soft start unit

    Thanks Rob, The duty cycle isn't that high maybe 5 starts per hour, The Soft start has facility for PTC termistor input so i'll go with 125A fuses.
  14. Rocboni

    Fairford synergy soft start unit

    Rob, Thanks that has cleared the motor configuration up, the motor will be connected in the "inside delta" configuration however i will keep the soft star specification at 45Kw this will allow for frequent starting of the blower up to trip class 30, so it should increase reliability for the...
  15. Rocboni

    Fairford synergy soft start unit

    Do you think it can be connected in delta and then 3 wires to the motor like you would connect a VFD?
  16. Rocboni

    Fairford synergy soft start unit

    That’ll be fun connecing two 16mm swa into it, I’ll go for a steel version, hopefully it has plenty room inside. 125A 6 Pole Boxed Isolator - https://www.motorstarters.co.uk/en/125a-6-pole-boxed-isolator
  17. Rocboni

    Fairford synergy soft start unit

    I agree FLC is only 77Amp I was planning on a 100a mccb starting current should be relatively low with the soft start. I have emailed fairfords for further advice. The motor will be wired in the delta configuration however this has brought up more issues as the soft start is remote from the...
  18. Rocboni

    Fairford synergy soft start unit

    Marconi Thanks for the reply, so when it says line it means series as in two windings in series (star) however I can get away with using a smaller soft start if wired in delta. I need to clarify the the trip class so I’ll leave this until I find out. Back to the circuit protection, I don’t...
  19. Rocboni

    Fairford synergy soft start unit

    Looking at using a fairford synergy soft start unit as below to start a 45kw motor, just wondering what it means by connected in line, I’m presuming they mean star but can see how the motor would run correctly being 400/690v rated...
  20. Rocboni

    PT Connection To Pump

    Is there a jumper between 2 and 6 for start signal?

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