GE 469

GE Power Management 469 Motor Management Relay 4-27
4 SETPOINT PROGRAMMING 4.6 S5 THERMAL MODEL
4
Figure 4–7: TYPICAL TIME-CURRENT AND THERMAL LIMIT CURVES (ANSI/IEEE C37.96)
1
10
8
6
4
2
100
80
60
40
20
200
300
400
0 100 200 300 400 500 600 % CURRENT
TIME-SECONDS
HIGH
INERTIA
MOTOR
RUNNING OVERLOAD
A
G
B
C
A,B,AND C ARE THE
ACCELERATION THERMAL LIMIT
CURVES AT 100%, 90%, AND
80%VOLTAGE, REPECTIVELY
E,F, AND G ARE THE
SAFE STALL THERMAL LIMIT
TIMES AT 100%, 90%, AND
80%VOLTAGE, REPECTIVELY
E
F
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