How the InfraStruXure Power Generation System Operates
Open and closed transfers
When transfers are not occurring, one switch is ON and one switch is OFF.
During a closed transfer, the second switch will turn ON before the first switch turns OFF, creating a brief period of time when both switches are ON.
Closed Transfer
Source 1 | Source 1 | Source 2 |
| Source 2 |
|
| t=miliseconds |
|
During an open transfer, the first switch will turn OFF before the second switch turns ON, creating a period of time when neither source is connected. This period is commonly referred to as neutral time. Neutral time is defined by the configurable Open Xfer Time.
Open Transfer
Source 1 | Neutral | Source 2 |
| t=seconds |
|
You can set whether or not to Allow Closed transfers under the Transfer Setup item on the ATS Setup menu on the display interface (see page 35 for details about these settings). If the Allow Closed setting is Yes, the ATS will always seek to perform closed transfers. In order for a closed transfer to occur, the voltage and frequency for both sources must be acceptable and both sources must be synchronized. The ATS monitors both sources for synchronization before transferring. If the time it takes for the sources to become synchronized exceeds the configured Max Sync Time, the ATS will perform an open transfer instead. During a closed transfer, the ATS also takes into account the time it takes for the switch to actuate. This results in a seamless transfer in which
If the Allow Closed setting is No, the ATS will never perform closed transfers; it will only perform open transfers (see page 35 for details about these settings).
8 | InfraStruXure Power Generation System |