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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...

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

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?

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

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...

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...

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

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...

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...

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...

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)

I have recently fitted a dc motor 16.7kw to a machine and noticed that the motor tends to whine quite loudly. i have been informed that this is common and will quieten down after a while is this true, what causes the whine is it harmonics if so why does it whine and why does it get quiter after...

we recenlty experienced a dc drive occasionally tripping on regen stops, I scoped the current output from the drive during motoring and regenerting conditions and all pulses were present every time i checked. the drive would trip on speed feedback error. initially i thought the encoder coupling...

Is there a problem with setting the targer power factor of a capacitor bank to unity? bearing in mind it is one of three independently acting capacitor banks the other two are set for 0.98. What is the minimum switching time i should be using to switch in and out capacitors? and what are the...

can anyone confirm for me that a 1600kva three phase transformer is rated for 2228A at 415v thanks

i am interested in learnig how to program the 16f84 pic can anyone suugest a good kit for beginners, i have bought pickit 1 but this doesnt program 16f84s which is the chip that most of the tutorials deal with thanx

The main transformer that feeds our plant is a 100kva transformer that feeds a 1600kva breaker at 433v how can i work out the maximum line current that i can pull on each phase before triping the breaker? IL=(KVA.1000)/(VL.1.73)= 2135A per phase is this correct? is it also true to say that if...

Are there any major considerations when changing from a linear to a switch mode power supply that feed assorted plc cards and components?

power factor correction capacitors are rated in kvar what is the formula that relates this to their value in farads 1/2.pi.fc gives xc but how is this related to kvar?

anyone have any experience with laplink? I have an installation of laplink that i use to control another computer remotely so i can accsss some drive monitoring software it works fine with all other software dos based as well as windows however when i open the .exe file for this application it...