Standard Features

Automatic Transfer: The digital Motor Bus Transfer System (MBTS)

provides the following Automatic Transfer logic and features:

• Transfer initiated by protective relay external to the MBTS

• Automatic Transfer after a loss of the motor bus supply voltage

based on the programmable undervoltage element. This provides a

selectable backup feature if a protective relay transfer is not initiated.

• Fast Transfer with adjustable phase angle limit, delta voltage limit

and delta frequency limit

• In-Phase Transfer at the first phase coincidence if Fast Transfer is

not possible.

• Residual Voltage Transfer at an adjustable low residual voltage limit

if Fast Transfer is not possible

• Fixed Time Transfer after an adjustable time delay

• Programmable load shedding prior to initiating In‑Phase Residual

Voltage Transfer and Fixed Time Transfer

• Verify the new source (the source to which the bus is being

transferred) is healthy and within acceptable upper and lower voltage

limits