HAT600R Series ATS Controller User Manual Page 42 of 59
13.4
SYNCHRONOUS CLOSE
Synchronous closing is transferring current power side to the other power supply under normal
condition of both S1 and S2. During this process synchronous transfer is needed. The synchronous
transfer can be divided into synchronous parallel transfer and in-phase transfer.
13.4.1
SYNCHRONOUS PARALLEL CLOSE
Sync. Parallel Transfer Enable
: When this is active (HAT600RS only), sync. parallel close function is
active, otherwise sync. parallel close function cannot be executed. The sync conditions are phase sync,
frequency sync, voltage sync (if sync voltage difference is enabled).
Sync. Phase Difference
: Maximum phase difference between S1 and S2 at synchronization. Usually
phase difference shall not be set too big. Otherwise, load impact will be too big at closing.
Sync. Freq. Difference
: Maximum frequency difference between S1 and S2 at synchronization.
Sync. Volt Difference (The difference between the average values of two voltages)
: Maximum voltage
difference between S1 and S2 at synchronization; if it is disabled, volt difference won't be detected in
synchronizing process.
Fail To Sync Delay
: Waiting time for sync; it shall issue sync failure alarm when it is overtime.
Fail To Sync Action
: Warning alarm or fault alarm can be set; after sync failure, it continues waiting for
sync until sync close is finished. For warning alarm when sync is completed or it exits from sync, alarm
shall be cleared; for fault alarm, it needs alarm reset key to clear the alarm.
Sync. Close/Open Feedback Time
: Pulse time for sync. parallel close/open; at the time of synch.
parallel transfer, sync close/open output delay starts; in the delay process if correct close status is
detected, then stop the close/open pulse output; if after delay is over, correct close status still cannot
be detected, close/open failure alarm shall be initiated.
Transfer On Sync Fail
: When this is enabled, after sync fails, non sync close will be conducted and no
sync failure alarm shall be issued.
Fig. 7 Sync. Parallel Transfer Diagram
13.4.1.1
S1 SYNCHRONOUS PARALLEL CLOSE
S1 is master, auto transfer auto restore, S1&S2 power voltages are normal. S2 is onload, and S1
close pulse outputs when detects that the sync signal (voltage sync, frequency sync and phase sync).
Until S1 close status is detected or delay is up to sync close/open detection time, disconnect S1 close
pulse output. At the same time S2 open pulse outputs; until S2 open status is detected or delay is over
sync close/open detection time, disconnect S2 open pulse outputs. In synchronizing process if
close/open time is over sync close/open detection time, then close/open failure alarm is initiated.
