Manual 37485A
DTSC-200 - ATS Controller
© Woodward
Page 19/21
The following example shows a transfer sequence, which fails to open the switch from both sources, which caus-
es the shunt trip enable flag to be enabled:
Initial situation:
A transfer from source 1 is initiated and the transfer switch is in
overlap position.
If the maximum overlap time has expired and the
LogicsManager
function "Extended parallel time" is FALSE, the
unit tries to open the transfer switch from the previous source. If
this fails, the unit detects an opening failure from the previous
source.
Now, the unit tries to open the transfer switch from the new
source. If this fails as well, the unit detects an opening failure
from the new source and enables the shunt trip enable flag
(20.12). This flag remains enabled until the switch is opened and
the failure has been acknowledged.
S1
S2
1
S1
S2
2
S1
S2
2