1774-TG A-B  Servo Controller

The PowerMonitor 5000 unit calculates phase angles of voltage and current, and checks these against three distinct ranges of system power factor: • Range 1: lagging 97% to leading 89%. This range is for very high lagging or significantly leading power factors. Examples of loads in this range include data centers, over-excited synchronous motors, and circuits with power factor correction. • Range 2: lagging 85% to leading 98%. This range includes most industrial circuits that range from lagging to slightly leading power factors, including circuits feeding AC variable-frequency drives. • Range 3: lagging 52% to lagging 95%. This range exhibits lower lagging power factors. Examples include lightly-loaded motor circuits and DC SCR drives. The power monitor displays wiring diagnostic status results for all three power factor ranges when a command is issued. You decide which power factor range applies based upon your knowledge of the circuit and its load characteristics. You can expect more reliable wiring diagnostic results when the circuit is operating in a normal condition, that is, not especially lightly loaded. Figure 29 illustrates the part power factor plays in wiring diagnostics. The PF ranges show the I1 phase angle limits for each range. The phasor diagram shows the fundamental voltage and currents in a three-phase, 4-wire system operating with a lagging power factor of roughly 85%. In this example, ranges 2 and 3 wiring diagnostic can return good results, but range 1 can incorrectly indicate that all currents are inverted and displaced by a phase, as shown by the –I1, -I2 and –I3 phasors.

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