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Re: WEL and Watt node
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Posted by Phil on Monday, 18 August 2008, at 11:53 a.m.,
in response to WEL and Watt node, posted by Dewayne Dean
Hi Dewayne.
First you need to verify that you are getting a correct indication of Watts and KWH's
The WNA-1P-240-P is the earlier version of the current WNB Watt-Node.
Unless you explicitly specified it when you purchased that unit, you probably have the standard 4Hz model. I typically recommended the 193Hz version of the meter because the higher pulse output frequency enables the WEL to perform accurate power measurements every minute.
The WEL counts the pulses it receives every minute and then applies the scale you've entered.
To get a feeling on what your pulse rate is, you may want to temporarily connect the Wattnode to Pulse Input 1. This will cause the WEL's Pulse1 LED to change state each time it detects a pulse.
On a typical 193Hz unit, the LED will blink slowly (once every few seconds) when just few Watts (50-100) are being used, and flicker very quickly when several KW are being used.
If you have a "standard" wattnode, the LED will only blink slowly even when you are pulling several KW.
Once you've done this test, move the WN back to WEL Pulse Input 4
The electrical load will appear on WEL device ID=9
(Pulse3 is Device 8, Pulse4 is device 9)
From an old WNA datasheet (linked below) I get that with a Standard WNA, with 30A CTS, each pulse is worth 0.75 WattHours. So when measured over one minute, each pulse equates to 0.75 * 60 Watts = 45 Watts. This means that you should be using 45 as your scale factor to convert pulses to Watts.
Then, set the "accumulation" to "b" to get daily and monthly KWh.
This higher scale factor (due to the slow pulse output) will make your electrical load chart look choppy, but it won't effect the accuracy of the accumulated "KWHour" numbers.
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