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HAT833 Series Three Power ATS Controller User Manual Page 46 of 56
12.2
AUTOMATIC OPERATION
Auto mode is selected by pressing the
button; a LED besides the button will illuminate to
confirm the operation.
Under auto mode, the controller will switch automatically to ensure power supply according to S1,
S2, S3 status, switch priority and Auto transfer/Restore status. Examples are showed below:
Table 24 – Auto Breaker Transfer Logic
Power Status
Breaker & Load
Status
S1>S2>S3
S2>S1>S3
S3>S1>S2
S1 Normal
S2 Normal
S3 Normal
Auto Trans./Restore
Breaker Status
Status IOO
QS1 Close
QS2 Open
QS3 Open
Status OIO
QS2 Close
QS1 Open
QS3 Open
Status OOI
QS3 Close
QS1 Open
QS2 Open
Load Status
S1 Supply
S2 Supply
S3 Supply
S1 Normal
S2 Abnormal
S3 Normal
Auto Trans./Restore
Breaker Status
Status IOO
QS1 Close
QS2 Open
QS3 Open
Status IOO
QS1 Close
QS2 Open
QS3 Open
Status OOI
QS3 Close
QS1 Open
QS2 Open
Load Status
S1 Supply
S1 Supply
S3 Supply
S1 Abnormal
S2 Normal
S3 Normal
Auto Trans./Restore
Breaker Status
Status OIO
QS2 Close
QS1 Open
QS3 Open
Status OIO
QS2 Close
QS1 Open
QS3 Open
Status OOI
QS3 Close
QS1 Open
QS2 Open
Load Status
S2 Supply
S2 Supply
S3 Supply
S1 Abnormal
S2 Abnormal
S3 Normal
Breaker Status
Status OOI
QS3 Close
QS1 Open
QS2 Open
Status OOI
QS3 Close
QS1 Open
QS2 Open
Status OOI
QS3 Close
QS1 Open
QS2 Open
Load Status
S3 Supply
S3 Supply
S3 Supply
S1 Abnormal
S2 Abnormal
S3 Abnormal
(With under volt trip
function)
Breaker Status
Status OOO
QS1 Open
QS2 Open
QS3 Open
Load Status
Off load
During the switching process, if fail to close or close inhibit occurs, the corresponding switch will
close no more, and other closable switch will supply power. If fail to open occurs, the switch won’t
execute any order.