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PowerLogic™ PM5300 series user guide | Chapter |
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Where:
•EM = energy measured by the meter under test
•ES = energy measured by the reference device or energy standard.
NOTE: If accuracy verification reveals inaccuracies in your meter, they may be caused by typical sources of test errors. If there are no sources of test errors present, please contact your local Schneider Electric representative.
Energy pulsing considerations
The meter’s alarm / energy LED and digital outputs are capable of energy pulsing within the following limits:
Energy pulsing limits
Description | Alarm / energy LED |
| Digital output |
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Maximum pulse frequency | 50 Hz |
| 25 Hz |
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Minimum pulse constant | 1 pulse per k_h |
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Maximum pulse constant | 9,999,999 pulses per k_h | ||
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The pulse rate depends on the voltage, current and PF of the input signal source, the number of phases, and the VT and CT ratios.
If Ptot is the instantaneous power (in kW) and K is the pulse constant (in pulses per k_h), then the pulse period is:
Pulse period (in seconds) = | 3600 | = | 1 |
VT and CT considerations
The test points are always taken at the secondary side, regardless of whether VTs or CTs are used. Ptot is derived from the values of the voltage and current inputs at the secondary side, and takes into account the VT and CT ratios.
If VTs and CTs are used, you must include their primary and secondary ratings in the equation. For example, in a balanced
Ptot = 3 × VLN × | × I × | × PF × | |||
| VT secondary |
| CT secondary |
| 1000 W |
Total power limit for alarm / energy LED
Given the maximum pulse constant (Kmax) you can enter is 9,999,999 pulses per kWh, and the maximum pulse frequency for the alarm / energy LED is 83 Hz, the maximum total power (Max Ptot) the alarm / energy LED’s energy pulsing circuitry can handle is
29.88 Watts:
3600 × (Maximum pulse frequency) 3600 × 83
Maximum Ptot =
Kmax9,999,999
Total power limit for digital output
Given the maximum pulse constant (Kmax) you can enter is 9,999,999 pulses per kWh, and the maximum pulse frequency for the digital output is 25 Hz, the maximum total power (Max Ptot) the digital input’s energy pulsing circuitry can handle is 9 Watts:
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