GE MULTILIN 269 MOTOR MANAGEMENT RELAY Series Instruction Manual page 66

6 •
ENABLE STATOR RTD VOTING ENABLE STATOR RTD VOTING
(2 RTDs>=TRIP)? (2 RTDs>=TRIP)?
This setpoint is used to enable or defeat the stator RTD voting feature. If enabled, any one Stator RTD
alone will not trip the motor even when it exceeds its trip setpoint. A minimum of two stator RTDs will
have to exceed both their individual trip setpoints before a trip signal is issued by the 269. The second
stator RTD encountered that is above its trip setpoint will be the cause of the trip. In addition, a reset of a
stator RTD trip will not be allowed unless both stator RTD temperatures are below their respective set-
points. Stator RTD Alarms are not affected by this feature. Stator RTD Alarms will still be issued based
on individual RTD temperatures.
If the number of stator RTDs is programmed to 1, then no stator RTD voting takes place.
YES - RTD Voting enabled
NO - RTD Voting disabled
Factory Value = YES
7 •
DEFEAT RTD INPUT TO DEFEAT RTD INPUT TO
THERMAL MEMORY ? XXX THERMAL MEMORY ? XXX
This setpoint is used to enable or defeat the thermal memory RTD bias feature of the relay (see section
3.20). With this feature defeated, the effect of the stator RTD temperature is not included in the thermal
memory:
YES - RTD bias defeated (RTD temperature does not affect thermal memory)
NO - RTD bias enabled (thermal memory affected as per section 3.20).
Factory Value = YES
8 *
RTD BIAS CURVE MINIMUM RTD BIAS CURVE MINIMUM
VALUE = XXX VALUE = XXX
(Not seen when RTD input to thermal memory is defeated. )
(See section 3.16)
This setpoint is used to set the RTD bias minimum value (see Figure 3.4):
This setpoint is typically programmed as the ambient temperature.
Limits: 0° C to (RTD Bias Center Temp – 1) in degrees C or F
Factory Value = 40
9 *
RTD BIAS CENTER T.C. RTD BIAS CENTER T.C.
VALUE = XX PERCENT VALUE = XX PERCENT
(Not seen when RTD input to thermal memory is defeated)
This is the thermal capacity value for the center point of the two part curve. This level may be set as the
percentage difference of the hot motor thermal damage curve to the cold motor thermal damage curve.
Center T.C. =
Limits: 1–99%
Factory Value = 15
•
Messages are not displayed if the answer to the question "ARE THERE ANY RTDs CONNECTED" is "NO".
This setpoint is located on page 2 of setpoints, line 3.
* Messages are not displayed when "RTD INPUT TO THERMAL MEMORY" (setpoints page 5, line 7) is defeated.
Setpoints, Pg. 5
XXX XXX
C C
[ ]
− ×
Hot motor stall time
1
Cold motor stall time
100
3 SETUP AND USE
3-27