Frequency/ speed measurement

Like many people I run some machines on inveters - partly for 3 phase
conversion but also for speed variation. Being a tidy person I've
tucked the inverters away inside the machine cabinets.
Is there a way to have the inverter frequency output displayed so that
I can at least mentally calculate "50% of rated speed" or similar. The
ideal would be a display that could be mounted somewhere visible.
Suggestions welcomed, simple and more complex!
Regards
Charles
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Reply to
Charles Ping
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RS sell quite a few frequency meters.
Chris
Reply to
Chris Eilbeck
Would it perhaps be simpler to just fit rpm meters to the spindles, which would give you direct reading of the rpm? No need for rough approximations, and probably less complex than wiring up a remote display to the inverter.
Regards Kevin
Reply to
Kevin Steele
Charles Many inverters have an analogue output that can be programmed to indicate speed (output frequency); if yours has this, the simplest method would be to connect a meter to this output. Another possibility is to remote the control panel; several inverters I've seen have the option to place the panel remotely, connected to the inverter by an RJ45 cable. If you program the inverter to display frequency you've got what you need. Martin.
Reply to
Martin Whybrow
Charles, on many there is the facility to run a separate frequency counter. Take a look at the wiring of the invertor in question. The IMO Jaguar cubs have provision for a 10V or 1mA meter to be connected between FM and CM Page 15 of the book.
-- Regards,
John Stevenson Nottingham, England.
Visit the new Model Engineering adverts page at:-
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Reply to
John Stevenson
Most inverters have at least one analogue output that can give a scalable output for frequency. You need just a small panel meter, to give you what you require.
Outputs are normally 0-10v or a 20mA current ouput.
Wayne....
Reply to
Wayne Weedon
That's the solution. Find the right meter, make a new front scaled with percentage, fit in box.
many thanks to all
Charles
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Reply to
Charles Ping

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