BECKWITH ELECTRIC M-4272, Instruction Book

Page: 186 / 217

System Setup and Setpoints – 4
4–75
S2 BF SOURCE 2 BREAKER FAILURE
(BREAKER STATUS)
Path: System/Setup/Setpoints/S2 BF
The S2 BF Source 2 Breaker Failure (Breaker
Status) selection from the Function Settings group
(Figure 4-33) opens the S2 BF Source 2 Breaker
Failure (Breaker Status) dialog screen (Figure 4-79).
The S2 BF Source 2 Breaker Failure Function
includes the same features as S1 BF except that it
monitors for a breaker failure of the Source 2 breaker.
60FL BUS VT FUSE LOSS
Path: System/Setup/Setpoints/60FL
The 60FL Bus VT Fuse Loss selection from the
Function Settings group (Figure 4-33) opens the
60FL Bus VT Fuse Loss dialog screen (Figure 4-80).
Enable/Disable — The top right corner of the display
includes a command button that will disable or
enable the function.
Delta Voltage Pickup — The 60FL Bus VT Fuse-
Loss condition is detected by comparing either the
Three-Phase voltage of the motor bus to the Three-
Phase voltage of the connected source (VT’s in
Three-Phase connection) or the Single Phase voltage
of the motor bus to the Single Phase voltages of the
connected source (VT’s in single phase connection):
• Phase A to Phase A
• Phase B to Phase B
• Phase C to Phase C
Time Delay — A Time Delay can be applied to
delay the 60FL Bus VT Fuse-Loss function output.
Bus VT Fuse Loss Condition — When the
difference in voltage between the bus and the
connected source is present for the time delay the
MBTS will respond based on the selection to either
Block Transfer or perform a Fixed Time Transfer
when a transfer is initiated. Since the bus voltage
cannot be observed the only possible transfer that
could be performed is the Fixed Time Transfer.
I/O Selection — The I/O Selection button opens the
60FL Bus VT Fuse-Loss I/O Selection Dialog Screen
(Figure 4-81) that allows any input or the Fuse Loss
(FL) function to be selected to block the 60FL
Function. The 60FL Function can also be used to
activate a selected output when it times out.
Figure 4-79 S2 BF Source 2 Breaker Failure (Breaker Status) Dialog Screen