GE 750 Instruction Manual page 78

ELECTRICAL INSTALLATION
3 - 16
In a similar manner, the 52b auxiliary contact only allows closing of the breaker when it is
open. In this breaker state, the 52b contact is shorted and a trickle current will flow through
the breaker's close circuitry. When the breaker is closed, the 52b auxiliary contact is open
and no trickle current will flow. When the breaker position monitoring inputs detect a
closed breaker, the close coil supervision monitoring function will be disabled.
When the
BRKR STATE BYPASS
circuits can be arranged to monitor the trip and close circuits continuously, unaffected by
breaker state. This application requires that an alternate path around the 52a or 52b
contacts in series with the operating coils be provided, with modifications to the standard
wiring as shown FIGURE 3–15: Trip/Close Coil Supervision on page 3–16. With these
connections, trickle current can flow at all times. If access to the breaker coil is available, as
shown in drawing A above, continuous coil monitoring regardless of breaker state is
possible without using a resistor to bypass the 52a/b contact.
A high speed solid state (SCR) output is also provided. This output is intended for
applications where it is required to key a communications channel.
FIGURE 3–15: Trip/Close Coil Supervision
setpoint is "Enabled", the trip and close coil supervision
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 3: INSTALLATION