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  1. bigheadted

    Nidec Id 300

    Hi I am trying to program a Nidec id300 motor mounted drive so that the Analogue input it uses as reference can be selected as wither 4-20ma or 0-10v via a digital input can anyone give me any pointers with this i can see that the Input type is controlled by setting a number in to a parameter...
  2. bigheadted

    comms

    bigheadted (Electrical) 9 Nov 06 17:06 is it likely that diconnecting a can bus comms link to a plc whilst powerd up will have damaged it
  3. bigheadted

    multiplex

    so i have a pc which ive been told mutiplexes its i/o i can see that the leds flash in seuence as it scans from card to card but what does this actually mean?
  4. bigheadted

    safety relays

    Might be a bit of a general question but can anyone suggest a god general approach to faultfinding with estop/safety relays, reset circuits and double stop loops etc
  5. bigheadted

    regulation

    respectfuly; i am stuch within the system i have got i agree the drives should power down ok, the fact is they dont and despite sending the cards back to manufacturers for repair they tend to do the same again at some later date? How can these modifications fail. maybe i should have mentioned...
  6. bigheadted

    regulation

    i will simplify my explination: i intend to interupt the output of the drive before it gets to the motor therefore isolating the motor.lockable. i intend to provide electrical interlocks to prevent the drive being isolated at his point whilst power can be supplied to the motor ie to stop some...
  7. bigheadted

    regulation

    I am working at a plant that after many years of denial is being dragged kicking and screaming into our current heath and safety regime my problem is that the health and safety department are insisting that full isolations be carried out on our machines before the cleaners, who uptill now have...
  8. bigheadted

    diode?

    good idea, although im not sure the company will meet the expense as it would mean either a plc change or some sort of converter device and there are 48 of these drives around the plant. i really have two options, attempting to offset the reference in th plc to account for the volt drop...
  9. bigheadted

    diode?

    thanks sometimes its good to know youre on the right track
  10. bigheadted

    diode?

    the reference to an inveter drive at work is 0-10v, the reference under general opperating conditions doesnot exceed 2.5v to achive the required speed. The reference comes from a PLC analogue output. before my time there was an issue that when the plc was first switched on it set its output to...
  11. bigheadted

    latched input

    skogsgurra thanks for your reply. the input was 24vdc i actually disconnected the wire to it. could you explain the cmos bit a little further for me thanks
  12. bigheadted

    latched input

    anyone have any experienced of inputs being latched on on plcs and suggestions to the possible causes. I have heard that poor neutral faults can cause this but cant really see how
  13. bigheadted

    leading powerfactor

    I have noticed that our plant pfc cubiles sometimes show a leading powerfactor for 10min or so as the capacitor banks switch back out after a sudden drop in load, Is this likely to cause any extra charges greater than that if the powerfactor was lagging rather than leading. are there any other...
  14. bigheadted

    24v supplies

    sorry to hasty again 24vdc supply to an estop loop consisting of both normal stop buttons and contacts from the stop relays of remote units that have their own 24v dc power supplies. i wish to put indicators along the estop loop to show where the 24v is broken,(this is a hardware stop loop that...
  15. bigheadted

    24v supplies

    assuming that all the 24v powersupplies in my system have neutrals tied to earth. what are the problems asssociated with using a neutral of one power supply with the live fom another. (the live is passed from one panel to the next in a loop of switches but the neutral is not) current rating of...
  16. bigheadted

    stop circuit regs

    thanks waross i perhaps should have expained further that this is circuit that maybe contains 200 or so estops that are divided up into indivdual groups of maybe 10 that are selectable between two master control stations each having a master stop relay as you described. each stop is currently...
  17. bigheadted

    stop circuit regs

    i am currently working on a macine that is modular and selectable, it has both software and hardware estop ciruits. because of its selectiblity this circuit is extremely complicated for a hardware stop circuit. i would like to put some sort of indication in to help identify any breaks in the...
  18. bigheadted

    batteries

    i wish to connect a 110ah battery in parallel with a 85ah battery for use in a motor caravan, is this a good idea can you see any problems with the charging and discharging cycles if so are these safety issues and how can i get round them (i am an electrician)
  19. bigheadted

    Testing AC motors

    hi you say the motor tests to be balanced between phases and doesnt smell. a megger test would show if the insulation had broken down, but this would have probably blown fuses. isolate the suply reconnect the motor, have someone stab in the contactor manually and if the resistance readings are...
  20. bigheadted

    motor whining

    both abb motors both same name plate etc

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