SoundGuy wrote:
time2roll wrote:
Actually PI EMS the trip delay on low voltage is 6 seconds.
Bad ground is instant. High voltage I don't know but speculate it is instant as I agree it should be.
Message here:
11/4/16
(to me), If the voltage falls below 104 Vac for more than 6 seconds, the EMS will disconnect. A loss of ground will cause an instantaneous disconnect. When an error occurs and then the cause clears, the time delay starts. In your example, if the error occurs every sixty seconds, power would not be restored, because the delay would be resetting to zero each time.
Regards,
Customer Support
919 267-6964
Interesting reply from Progressive, especially since without proof I question it's veracity. ;) I own a calibrated DVM and used it to calibrate my own EMS-HW30C's voltage readout which as delivered was wildly inaccurate so I am familiar with the inner workings of this device. I also know from personal experience while camping that my unit does trip the instant incoming source voltage falls below it's low voltage trip threshold of 104 vac. Of course the most accurate method to confirm this would be on the workbench, using a calibrated DVM and Variac as a source supply. This I could have easily done back during my career days but now that I'm retired I no longer have access to a Variac and I'm sure not going to buy one just to prove Progressive's claim, one way or the other. My question however is - if their EMS does in fact feature a 6" low voltage nuisance trip delay where is that information in any of their documentation or even online? Common sense says the manufacturer would want to advertise this feature IF indeed it does exist, yet I haven't seen it. :R
mine behaves like yours. and a 6 second delay seems like a BAD idea. if it drops below 104 then continues to drop, say to 80 volts a few seconds later and takes 4 more seconds to disconnect? not likely. I could see it taking a few cycles but not 6 seconds.
Now if the delay is coupled with another voltage limit such that for a few seconds it can go to 102V and then back up to 105 without tripping, yes, that I can see.
