Schneider Electric PM850, PM870 Waveform Capture, Number Channels, Number of Samples per Cycle

63230-500-225A2	PowerLogicTM Series 800 Power Meter
3/2011	Chapter 8—Waveform Capture

Chapter 8—Waveform Capture

Introduction

This section explains the waveform capture capabilities of the following Power Meter models:

•PM850

•PM870

See Table 8–1for a summary of waveform capture features.

Table 8–1: Waveform capture summary by model

Waveform Capture Feature	PM850	PM870
Number of waveform captures	5	5
Waveform initiated:
Manually		
By alarm		
Samples per cycle	128	Configurable*
Channels (1 to 6)	Configurable	Configurable*
Cycles	3	Configurable*
Precycles	1	Configurable*
* See Figure 8–1.

Waveform Capture

A waveform capture can be initiated manually or by an alarm trigger to analyze steady- state or disturbance events. This waveform provides information about individual harmonics, which PowerLogic software calculates through the 63rd harmonic. It also calculates total harmonic distortion (THD) and other power quality parameters.

NOTE: Disturbance waveform captures are available in the PM870 only.

In the PM850, the waveform capture records five individual three-cycle captures at 128 samples per cycle simultaneously on all six metered channels. In the PM870, there is a range of one to five waveform captures, but the number of cycles captured varies based on the number of samples per cycle and the number of channels selected in your software. Use Figure 8–1to determine the number of cycles captured.

Figure 8–1: PM870 Number of Cycles Captured

6

5

4

Number

of 3

Channels

2

1

PLSD110333

30 15 7 3

35 15 9 4

45 20 10 5

60 30 15 7

90 45 20 10

185 90 45 20

16 32 64 128

Number of Samples per Cycle

NOTE: The number of cycles shown above are the total number of cycles allowed (pre- event cycles + event cycles = total cycles).

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