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Home ⊙ NEWS ⊙ Eaton ATC-900 Automatic Transfer Switch Controller Load voltage decay operation
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Eaton ATC-900 Automatic Transfer Switch Controller Load voltage decay operation

From:Eaton | author:Mr.Chen | Time :2025-08-21 | 5 view: | Share:

Load voltage decay operation (open transition)

Load voltage decay utilizes the load voltage measurements to sense

back EMF that is generated when the transfer switch is in the

neutral position (electrical load disconnected). It provides a delay

in transfer in either direction if an unacceptable level is sensed

as established by a customer programmed level. The transfer will

not take place until the back EMF decays below the acceptable

programmed level. This feature has a separate setting of enabling or

disabling the operation. If disabled, the transfer switch will not delay

in the neutral position and will transfer between the sources as fast

as possible.

Time delay neutral operation (open transition)

Time delay neutral provides a time delay in the transfer switch

neutral position when both breakers/contactors are open. This delay

takes place when the load is transferred in either direction to prevent

excessive in-rush currents due to out of phase switching of large

motor loads.

Optional feature 29G: Type of operation (selectable automatic or

non-automatic)

This feature provides two door mounted selector switches marked

auto/manual and S1-trip-S2 which permits the selection of automatic

or manual operation. In manual operation, the user can manually initi

ate and electrically operate between S1. trip, or S2. On the contactor

bypass’s, 29G uses the top switch and the bottom switch. The newer

contactor bypasses (some starting in 2018) have 29G integrated and

standard for either the ATS or the bypass contactors. See the switch

instruction booklet for operating  instructions. The controller is in

monitor mode during the manual operation meaning the controller

will not attempt to change the switch position but will monitor the

voltage availability and the switch positions. The ATC-900’s display

will show “Monitor Mode”.

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