Switching Device - GE 869 Instruction Manual

SYSTEM

Switching Device

Breakers
FASTPATH:
4–82
The 869 supports two types of motor switching devices: breakers and contactors. A
breaker operation is controlled by two coils labeled "Trip" and "Close". Each of them has to
be separately energized with a short pulse in order to change the state of the breaker. A
contactor operation is controlled by a single coil. When the coil is energized, the main
contacts are closed and when the coil is de-energized, the main contacts are open.
The user has to select either "Breaker" or "Contactor" and the selection has to match the
actual device type used. The selection is made in Setpoints > System > Motor > Switching
Device Type.
The breaker connection/disconnection to/from the power system (racked-out by the
breaker racking mechanism, or isolated by the associated disconnect switches on a fixed
circuit breaker) is provided by monitoring the contact input "BKR CONNECTED". If the
contact input selected under the "BKR CONNECTED" setpoint is asserted, the breaker is
considered connected to the primary system. When the breaker is determined
disconnected, the breaker state is shown to be neither open, nor closed.
Path:
Setpoints > System > Breakers > Breaker X
NAME
Range: Up to 13 alphanumeric characters
Default: BKR1
CONTACT INPUT 52a
Range: Off, Any FlexLogic operand
Default: Off
Selects the Contact Input connected to the breaker auxiliary contact 52a.
CONTACT INPUT 52b
Range: Off, Any FlexLogic operand
Default: Off
Selects the Contact Input connected to the breaker auxiliary contact 52b.
CONNECTED
Range: Off, Any FlexLogic operand
Default: Off
Select a contact input to show whether the breaker is connected (Racked-in, or
disconnect switches switched-on), or disconnected (racked-out, or disconnect switches
switched-off) from the system.
CLOSE RELAY SELECT
Range: Off, Relay 2
Default: Relay 2
Selection of "Relay 2" assigns the START command to Output Relay 2 (CLOSE/AUX). If "Off"
is selected, Auxiliary Relay 2 is available for selection in all elements with auxiliary relay
selection in the 869 and it is not activated by START command.
If "Relay 2" is selected, Auxiliary Relay 2 is not available for selection in any element.
Table 4-19: Breaker status depending on availability of contacts 52a and 52b
52a Contact Configured
Yes
52b Contact Configured Breaker Status
Open
Yes 52a contact open
52b contact closed
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
Closed
52a contact closed
52b contact open