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WattNode Pulse - Option PW - Pulse Width

See MS-17-WNB-Pulse-Option-PW.pdf (Manual Supplement MS-17) for a detailed explanation.

Overview

The WattNode® Pulse meter with Option PW specifies the pulse ON (closed or conducting) period in milliseconds. For example, the following configures 100 millisecond pulse ON periods:

Opt PW=100

This option is compatible with all other pulse options including P3, DPO, PV, Hz, etc.

Selection

The pulse width can be set as fast as 1 millisecond and as slow as 65 seconds (65000 milliseconds), but in practice, the maximum pulse width PWmax is limited to:

PW_{max}=\frac{500}{H\!z}

Where Hz is the nominal full-scale pulse frequency, 4.00 Hz is the default unless Option Hz or Option Kh have been specified. The following table lists the maximum pulse width for some common full-scale frequencies.

Full-Scale Frequency Hz Allowable Pulse Width Milliseconds PWmax
100 Hz 1 - 5 milliseconds
20 Hz 1 - 25 milliseconds
10 Hz 1 - 50 milliseconds
4 Hz 1 - 125 milliseconds
1 Hz 1 - 500 milliseconds
0.1 Hz 1 - 5000 milliseconds (5 seconds)
0.01 Hz 1 - 50000 milliseconds (50 seconds)

If your WattNode meter also has Option Kh, then see WattNode Pulse - Option Kh - Watt-Hours Per Pulse for information on computing the full-scale frequency as a function of the Kh and CT amps values.

Limitations

There are a few limitations with Option PW:

See Also

 

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