GE 469

CHAPTER 5: SETTINGS
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–45
FIGURE 5–7: Custom Curve Example
Note
During the interval of discontinuity, the longer of the two trip times is used to reduce the
chance of nuisance tripping during motor starts.
MULTIPLE OFFULL LOAD CURRENTSETPOINT
TIME TO TRIP IN SECONDS
0.1
1.0
10
100
1000
10000
0.5
1
10
100
1000
806803A6.CDR
6500 HP, 13800 VOLT INDUCEDDRAFT FAN MOTOR
TYPICAL CUSTOMCURVE
1
2
3
4
5
2
3
4
5
1
PROGRAMMED 469 CUSTOM CURVE
RUNNINGSAFETIME (STATOR LIMIT)
ACCELERATION SAFETIME (ROTOR LIMIT)
MOTORCURRENTat100% VOLTAGE
MOTORCURRENTat80% VOLTAGE
GE Multilin