GE 239 Instruction Manual page 52

4 PROGRAMMING
a) TRIP RELAY
• TRIP OPERATION: Any trip condition will activate the trip relay. This relay can be programmed
to be 121)$,/6$)( or )$,/6$)( . After a trip, the relay trip state will remain latched until reset by
pressing the
port reset command.
Where process continuity is more important than motor protection, the mode of operation can be
chosen as 121)$,/6$)( so the trip relay is normally de-energized for a non-trip condition and
energized for a trip. No trip occurs if control power to the 239 is lost but there will be no motor
protection while this condition is present. Set the mode to )$,/6$)( (the relay coil is normally
energized for a non-trip condition going non-energized for a trip) to cause a trip when control
power to the 239 is not present to ensure continuous motor protection.
When the motor interrupting device is a breaker, the trip relay is usually programmed 121)$,/
6$)( and the trip contact wired in series with the breaker trip coil. Even though the trip contact is
latched, the breaker 52 contact will normally be wired in series with the 239 trip contact so that
the breaker 52 contact breaks the trip coil current as soon as the breaker opens. The 239 trip
messages and records operate in the same way for contactors or breakers so the trip condition
4
must still be cleared using the
by sending the reset command via the computer.
b) ALARM RELAY
• ALARM OPERATION: Any alarm condition will activate the alarm relay. If an alarm is required
when the 239 is not operational due to a loss of control power, select )$,/6$)( operation. Other-
wise, choose 121)$,/6$)( .
• ALARM ACTIVATION: If an alarm indication is only required while an alarm is present, select
81/$7&+(' . Once an alarm condition disappears, the alarm and associated message automati-
cally clear. To ensure all alarms are acknowledged, select /$7&+(' . Even if an alarm condition is
no longer present, the alarm relay and message can only be cleared by pressing the
key, momentarily closing the external reset terminals, or by sending the reset command via the
computer.
c) AUXILIARY RELAY
• AUXILIARY OPERATION: Any alarm, trip or auxiliary function can be programmed to activate
the auxiliary relay. If an output is required when the 239 is not operational due to a loss of control
power, select )$,/6$)( auxiliary operation, otherwise, choose 121)$,/6$)( .
• AUXILIARY ACTIVATION: If an auxiliary relay output is only required while the alarm or auxiliary
function is present, select 81/$7&+(' . Once an alarm or auxiliary function condition disappears,
the auxiliary relay returns to the non-active state and the associated message automatically
clears. To ensure all alarms or auxiliary function conditions are acknowledged, select /$7&+(' .
Even if an alarm or auxiliary function condition is no longer present, the auxiliary relay and mes-
sage can only be cleared by pressing the
terminals, or by sending the reset command via the computer.
• AUXILIARY FUNCTION: If the auxiliary relay is required to be controlled by the function it's
assigned to then configure this setpoint to 1250$/ . If the auxiliary relay is required to activate on
an occurrence of an alarm or trip condition and remain energized while the alarm or trip condition
is present then configure the setpoint to $/$50 or 75,3 depending on the requirement.
4-14
Courtesy of NationalSwitchgear.com
key, momentarily closing the external reset switch input, or issuing a serial
RESET
RESET
239 Motor Protection Relay
key, momentarily closing the external reset terminals, or
key, momentarily closing the external reset
RESET
4 PROGRAMMING
RESET
GE Multilin