Trip Relay; Alarm Relay; Auxiliary Relay - GE 239 Instruction Manual

CHAPTER 4: PROGRAMMING
4.4.1

Trip Relay

4.4.2

Alarm Relay

4.4.3

Auxiliary Relay

239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
• TRIP OPERATION: Any trip condition will activate the trip relay. This relay can be
programmed to be
NON-FAILSAFE
remain latched until reset by pressing the
external reset switch input, or issuing a serial port reset command.
Where process continuity is more important than motor protection, the mode of
operation can be chosen as
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 (the relay coil is normally energized for a non-trip condition going
FAILSAFE
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
and the trip contact wired in series with the breaker trip coil. Even
NON-FAILSAFE
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 must still be cleared
using the key, momentarily closing the external reset terminals, or by
RESET
sending the reset command via the computer.
• 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
operation. Otherwise, choose
FAILSAFE
• ALARM ACTIVATION: If an alarm indication is only required while an alarm is present,
select . Once an alarm condition disappears, the alarm and associated
UNLATCHED
message automatically clear. To ensure all alarms are acknowledged, select
Even if an alarm condition is no longer present, the alarm relay and message can only
be cleared by pressing the
terminals, or by sending the reset command via the computer.
• 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
NON-FAILSAFE .
• AUXILIARY ACTIVATION: If an auxiliary relay output is only required while the alarm or
auxiliary function is present, select
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
condition is no longer present, the auxiliary relay and message can only be cleared by
pressing the
RESET
sending the reset command via the computer.
or . After a trip, the relay trip state will
FAILSAFE
RESET
so the trip relay is normally de-energized
NON-FAILSAFE
NON-FAILSAFE
key, momentarily closing the external reset
RESET
FAILSAFE auxiliary operation, otherwise, choose
. Once an alarm or auxiliary function
UNLATCHED
. Even if an alarm or auxiliary function
LATCHED
key, momentarily closing the external reset terminals, or by
key, momentarily closing the
.
LATCHED
4–25
.