Easy frequency/speed monitoring

[cschuerm]

just FYI.  If anyone is looking for an easy way to implement an over/under frequency/speed shutdown, you might want to consider a Timemark(tm) Model 292.  It has programmable lo/high freq setpoints with a dry contact output.  I've used tons of their devices and have had great luck.
I'm going to be using one of these when I build my permanent generator shed to control a starter (ie: giant relay) to connect/disconnect generator output to my house as well as for an overspeed shutdown.
http://time-mark.com/products.php?id=49

cheers,
Chris

[rcavictim]

What do you mean when you refer to a "dry contact output"?  Is this a non-wetted (as in non-mercury) relay closure contact?

[rcavictim]

I recently discovered through a huge momentary overload, that when the output frequency of my VW power plant goes to zero, the engine shuts itself off automatically!  This even though I did not bother installing under frequency auto shutdown.  Can someone please explain to me how this is possible?   

[cschuerm]

Correct - "dry contact" refers to a mechanical contact closure - ie: relays.

Insufficient info to even make a guess on the VW issue.  Must be *something* involved if it's really a shutdown on frequency...

chris

[listerboy]

Quote:
"I recently discovered through a huge momentary overload, that when the output frequency of my VW power plant goes to zero, the engine shuts itself off automatically!  This even though I did not bother installing under frequency auto shutdown.  Can someone please explain to me how this is possible? "

Insufficient HP!   

[adhall]

What do you mean when you refer to a "dry contact output"?  Is this a non-wetted (as in non-mercury) relay closure contact?

In the industrial controls world, "dry contact" means a relay contact that is electrically isolated from the power source that controls it--as opposed to an output device which supplies power from an internal source when it is turned on.

Best regards,
Andy Hall

[RJ]

Cool product. Any idea what it costs? I didn't see anything listed.

[sailawayrb]

Cool product. Any idea what it costs? I didn't see anything listed.

The Time Mark Voltage/Frequency Monitor (Model 2962) costs approximately $300. 

http://www.byramlabs.com/product_info.php/products_id/8416

I believe the Time Mark Frequency Monitor (Model 292) costs approximately $200.  For me, using a voltage sensor relay for overspeed protection was preferable because of the much smaller package and lower cost.