HAT600R Series ATS Controller User Manual Page 43 of 59
Fig. 8 S1 Sync. Parallel Close Procedure Oscillogram
13.4.1.2
S2 SYNCHRONOUS PARALLEL CLOSE
S2 is master, auto transfer auto restore, S1&S2 power voltages are normal. S1 is onload, and S2
close pulse outputs when detects that the sync signal (voltage sync, frequency sync and phase sync).
Until S2 close status is detected or delay is up to sync close/open detection time, disconnect S2 close
pulse output. At the same time S1 open pulse outputs; until S1 is opened or delay is over sync
close/open detection time, disconnect S1 open pulse outputs. In synchronizing process if close/open
time is over sync close/open detection time, then close/open failure alarm is initiated.
Fig. 9 S2 Sync. Parallel Close Procedure Oscillogram
t1: S2 starts to sync. close;
t2: S2 close signal is active;
t3: execute S1 open;
t4: S1 close signal is inactive;
t5: S1 open ends;
t1: S1 starts to sync. close;
t2: S1 close signal is active;
t3: execute S2 open;
t4: S2 close signal is inactive;
t5: S2 open ends;
