AFX SERIES® OPERATION MANUAL
Rear Panel, Connectors and Protection
Entire Contents Copyright
2018 by Pacific Power Source, Inc. (PPS) • All Rights Reserved • No reproduction without written authorization from PPS.
AFX Series Power Source Operation Manual
Page 195 of 485
Figure 7-3: External Trigger Input Timing
7.3.7
External or Line Sync Input
SYNC
IN/OUT
The phase sync input can be used to synchronize in frequency and phase the internal
waveform generation of the AFX to an external sync reference or to the AC mains. The
reference must be within the specified frequency range of the power source and zero phase
offset calibration for phase A may be required to compensate for any phase shifts. Note
than Phase B and C are still phase related to A as programmed by B and C phase angles.
7.3.7.1
Principle of Operation
In AC Line sync mode, the AFX uses the L-L AC input voltage to generate the internal sync
signal. The goal of the phase sync is to provide precise frequency synchronization, and
consistent phase at a given operating point, but the phase shift between AC input and AC
output is not automatically zero. A phase adjustment for Phase A must be made by the user
to time-align the power source’s phase A output voltage to the L1 leg of the actual three
phase Grid voltage powering the AFX.
A couple of factors affect the phase shift:
•
The internal AC sync circuits have some inherent delays. If more accuracy is required
then the TTL input mode can be used instead using an external line sync circuit.
Summary of Contents for AFX Series
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