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GE 469

GE 469
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CHAPTER 5: SETTINGS
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–47
If the motor is called upon to drive a high inertia load, it is quite possible and acceptable for
the acceleration time to exceed the safe stall time (keeping in mind that a locked rotor
condition is different than an acceleration condition). In this instance, each distinct portion
of the thermal limit curve must be known and protection must be coordinated against that
curve. The relay protecting the motor must be able to distinguish between a locked rotor
condition, an accelerating condition, and a running condition. The Voltage Dependent
MESSAGE
TIME TO TRIP AT
4.75 x FLA: 16.2
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
5.00 x FLA: 14.6
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
5.50 x FLA: 12.0
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
6.00 x FLA: 10.0
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
6.50 x FLA: 8.5 s
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
7.00 x FLA: 7.3 s
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
7.50 x FLA: 6.3 s
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
8.00 x FLA: 5.6 s
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
10.0 x FLA: 5.6 s
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
15.0 x FLA: 5.6 s
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
TIME TO TRIP AT
20.0 x FLA: 5.6 s
Range: 0.5 to 99999.9 s in steps of 0.1
MESSAGE
MINIMUM ALLOWABLE
LINE VOLTAGE: 80%
Range: 70 to 95% in steps of 1
MESSAGE
STALL CURRENT @
MIN
Range: 2.00 to 15.00 x FLA in steps of
0.01
MESSAGE
SAFE STALL TIME @
MIN Vline: 20.0 s
Range: 0.5 to 999.9 s in steps of 0.1
MESSAGE
ACCEL. INTERSECT
@
Range: 2.00 to STALL CURRENT @ MIN
VLINE
– 0.01 in steps of 0.01
MESSAGE
STALL CURRENT @
100%
Range: 2.00 to 15.00 x FLA in steps of
0.01
MESSAGE
SAFE STALL TIME @
100% Vline: 10.0
Range: 0.5 to 999.9 s in steps of 0.1
MESSAGE
ACCEL. INTERSECT
@
Range: 2.00 to STALL CURRENT @ MIN
VLINE
– 0.01 in steps of 0.01

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