HAT880 SERIES DUAL POWER BYPASS CONTROLLER USER MANUAL
HAT880 Series Dual Power Bypass Controller 2019-07-11 Version1.1 Page 41 of 49
12.3.2
S2 SYNC CLOSE
S1&S2 power voltages are normal. S1 is onload, and S2 close pulse outputs. 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. 5 - S2 Sync Close Procedure Oscillogram
12.3.3
MANUAL SYNC CLOSE
When it is manual mode, and S1&S2 power are normal, if S1 is closed, press S2 close key and S2
closes synchronously. If S2 is closed, press S1 close key, and S1 closes synchronously. In the process
of waiting for sync, press close key again and sync close is stopped. If sync waiting is overtime, sync
failure warning alarm is initiated; but it will continue waiting to sync, until sync is completed, or cancel
sync close by pressing close key.
12.3.4
AUTO SYNC CLOSE
When it is auto mode and backup power is normal and backup is closed, master will sync close if
master power recovers.
WARNING: when sync close is active, S1 and S2 may be in parallel. If system is S1 Mains S2
Mains, please do the locking on switch side to prevent S1 and S2 close at the same time. Otherwise,it
may cause switch or lines burning or personal injury if it is serious.
