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Eaton ATC-900 Automatic Transfer Switch Controller Closed transition operation

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

Closed transition operation

Closed transition is a feature that will temporarily parallel two live

sources in a make-before-break scheme when performing a transfer.

This achieves a transfer between sources with no power interrup

tion. Both sources must be synchronized in frequency, phase, and

voltage before the transfer will take place. Closed transition voltage

and frequency limits are adjustable in the system setpoints  (3 of 5)

screen. Maximum phase difference is fixed at 0.3 degrees.

Several options for closed transition

Once an ATS is in the field, other uses or changes may occur that

could require changes from the original configuration. For example,

an application may initially require that only a closed transition should

be used and if it fails to sync, then the transfer switch will not switch

to the other source and will show an alarm. If the requirements

change  and the transfer switch needs to transfer using open transi

tion if closed does not occur, instead of sending the controller back

to the factory for reprogramming, the user can easily change the

transition setpoints to accomplish this.

If the controller is ordered with closed-transition enabled, the

user will have access to options 47C, D, E, F and G, which can be

changed by the setpoints to disable or enable the functions (see

below). Screen 3 of 5 in the system setup menu (See section 3.4.1)

is where the user can set the closed transition options as shown below:

47C = Closed/in-phase/load voltage decay

47D = Closed only (alarm on sync fail)

47E = Closed/in-phase/time delay neutral

47F = Closed/load voltage decay

47G = Closed/time delay neutral

The user can also disable closed transition and just use the following:

In-phase > TDN

In-phase > LVD

Also with closed transition and in-phase disabled: TDN or LVD

The user setpoints for closed transition are as follows: Disabled (closed transition not used)

Alarm on synchronization fail (will not switch and will show an alarm)

Fallback to open on synchronization fail (to in-phase, TDN, and/or LVD)

For in-phase and closed transfers, the phase difference between

sources is displayed above the ATC-900’s sync time countdown message.

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