GE Industrial Solutions MX350 Instruction manual - Manual (Page 104)

7–4 MX350 AUTOMATIC TRANSFER CONTROL SYSTEM – INSTRUCTION MANUAL
PHASORS CHAPTER 7: DIAGNOSTICS
Phasors
The Home > Diag > Phasors page displays phase rotation, voltages and angles, frequency,
and phase difference for both sources. The figure below shows a typical screen for a 240V,
3-phase system. In this example, the both sources are on an ABC rotation with an actual
phase angle difference of 1.3 degrees. The frequency differential between both sources is
ensuring that the phase angle will be driven towards 0 during the synchronization period.
If the resulting phase angle difference becomes less than 10° (factory default), the
controller will allow the switch to transfer.
This page also features a status message that will inform the operator about the lead
status of one power source with respect to the other power source. When the phase angle
is less than 3°, the message changes ‘S2 In Sync w/ S1’.
Figure 4: Typical phasor page
NOTE
NOTE: Voltage metering displayed on this page is L-N for a 3-phase system. L-L values are shown
on the Voltage Metering page. See the Voltage Metering section in the Actual Values
chapter of this manual.