GE 339

2–30 339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
ELECTRICAL INSTALLATION CHAPTER 2: INSTALLATION
Figure 2-33: Wet contact connections
Trip and Close output relays
The 339 relay is equipped with seven electromechanical output relays: 2 Form A (Relay 1,
Relay 2), and 5 Form C (Relays 3 to 7).
When SWITCHING DEVICE is selected as BREAKER:
Output Relays:
• For special purpose:
– Output Relay 1 (non-failsafe, seal-in): Breaker Trip
– Output Relay 2 (non-failsafe, seal-in): Breaker Close
– Output Relay 3 (non-failsafe, self-reset): Start Inhibit
– Output Relay 7 (fail-safe, self-reset): Critical Failure
• For general purpose:
– Output Relays 4 to 6 - non-failsafe; can be programmed as self-reset or latched.
Operation of the Trip and Close output relays is designed to be controlled by the state of
the circuit breaker as monitored by a 52a or 52b contact.
• The Trip and Close relays reset after the breaker is detected in a state corresponding
to the command. When a relay feature sends a command to one of these special
relays, it will remain operational until the requested change of breaker state is
confirmed by a breaker auxiliary contact and the initiating condition has reset.
• If the initiating feature resets, but the breaker does not change state, the output relay
will be reset after a default interval of 2 seconds.
• If neither of the breaker auxiliary contacts, 52a nor 52b, is programmed to a contact
input, the Trip Relay is de-energized after either the delay programmed in the Breaker
Failure feature, or a default interval of 100 ms after the initiating input resets. The
Close Relay is de-energized after 200 ms.
• If a delay is programmed for the Trip or Close contact seal-in time, then this delay is
added to the reset time. Note that the default setting for the seal-in time is 40 ms.
Wet Contact Connection
36(5,(6 RELA
Y
C1Contact Input 1
Contact Input Common
C11
V DC Power
Supply
LOGICIN.CDR
52a Contact
Configured
52b Contact
Configured
Relay Operation
Yes Yes Trip Relay remains operational until 52b indicates an
open breaker. Close Relay remains operational until 52a
indicates a closed breaker.