Auto Transfer Auto Restore - Smartgen HMAT880 User Manual

If close failure or close inhibit occurs during transferring, corresponding ATS will not close, other
ATS can control close supplies power for load. If open fails, ATS has no action.
11.2.2

AUTO TRANSFER AUTO RESTORE

Set S1 Mains S2 Gen, auto transfer/restore, S1 master and load stepwise switch control is
enabled.
If S1 is normal, S1 breaker will close, after close if over, genset start signal is inactive; Load
breaker close/open status is detected, load breaker closes step by step according to set close
sequence and interval time, main power supplies power for load.
If S1 is abnormal, it will enter S1 abnormal delay, after the delay is over, genset start signal
outputs, load breaker opens step by step according to set open sequence and interval time (open
control is enabled), after the load side open is over, open S1 breaker and wait for S2 normal. After S2
normal delay, S2 breaker closes. After standby S2 is closed, load breaker close/open status is
detected, load breaker closes step by step according to set close sequence and interval time, standby
power supplies power for load.
If main power recovers, transfer load to its side to realize auto transfer, auto restore.
HMAT880 Medium Voltage Bypass ATS Controller User Manual
Fig.2 – Auto Trans./Restore Flowchart
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