April 28, 2003

New Features for the Micro-AT^® Source-Transfer Control.

S&C is pleased to announce the release of a new version of Micro-AT Firmware, 2.5.3, which contains a number of new features that users have requested. These features are now standard on all Micro-AT units.

Below is a summary of some of these features:

• Unbalance Detection: Detection of source-side events is improved by monitoring negative sequence voltage and zero sequence voltage.
• Source Bad Criteria: This menu item allows the user to recognize a source considered bad when a single phase drops below the loss of source threshold setting, or a source considered bad when all three phases drop below the loss of source threshold setting.
• Voltage Sensing Configuration: This menu item allows the user to select whether the primary windings of monitoring sensors are connected Line-to-Line or Line-to-Ground. In both cases, the sensor secondaries must be referenced to local chassis ground.
• Loss of Source Voltage Range: The range is now 10V to 105V.
• Restore Factory Defaults: This function sets all field adjustable items back to the factory-settings.
• Adjustable Window Length Time: The time duration of the “window” in which an automatic return-of-source transfer can occur will now be adjustable from 1 minute to 3 hours.
• Test Key Enable/Disable Event Log Entries: This feature allows the user to distinguish between actual events and events performed during routine testing and commissioning.

If you have any questions about Firmware Version 2.5.3, or wish to obtain information about upgrading an existing Micro-AT, contact your S&C Sales Representative.