Reverse Phase - Omron KM1 User Manual

Reverse phase

PMU1A PMU2A
(Electric (Power
power) two-system)
Reverse phase means that the phase order of voltages is not normal.
When the phase order is normal, phases R, S, and T are 0°, 120°, and 240°, respectively,
with reference to phase R. If a measurement of the relationships between differences in
phase indicates that the condition is broken and then the broken condition continues for 0.1s
or more, it is judged as reverse phase.
Reverse phase can be used to confirm problems in facilities or wrong wiring.
* Since the condition where phases are not normal is judged as reverse phase, phase-loss
may be judged as reverse phase.
Phase R
Phase S
Phase T
Normal phases
EMU8A CTD8E
(Pulse/temperature) (CT
expansion)
× × : With two-system O: With function
Without function
Phase R
Phase S
Phase T
Reverse phase
3.6 Other functions
X:
3-11