Synchronous Transf°' Control - The Synchronous Transfer Control issues an activate input signal to the PTR during the synchronous transfer time window. This enables the PTR to close the breaker, using the In Phase Transfer technique.
Residual Volt-age Control - The Residual Voltage Control is enabled by the sequencer. The Residual Voltage Control compares the bus voltage to a preset lower limit and issues a close command when the bus voltage drops below the voltage limit.
The Residual Voltage Control also includes a Load Trip relay output that closes approximately SO milliseconds before the breaker close contact closes when the TLC closes on residual voltage. This provides for load shedding on Residual Voltage Transfers.
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