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CHAPTER 5: SETTINGS
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
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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
TIME TO TRIP AT
4.75 x FLA: 16.2
TIME TO TRIP AT
5.00 x FLA: 14.6
TIME TO TRIP AT
5.50 x FLA: 12.0
TIME TO TRIP AT
6.00 x FLA: 10.0
TIME TO TRIP AT
6.50 x FLA: 8.5 s
TIME TO TRIP AT
7.00 x FLA: 7.3 s
TIME TO TRIP AT
7.50 x FLA: 6.3 s
TIME TO TRIP AT
8.00 x FLA: 5.6 s
TIME TO TRIP AT
10.0 x FLA: 5.6 s
TIME TO TRIP AT
15.0 x FLA: 5.6 s
TIME TO TRIP AT
20.0 x FLA: 5.6 s
MINIMUM ALLOWABLE
LINE VOLTAGE: 80%
STALL CURRENT @
MIN
SAFE STALL TIME @
MIN Vline: 20.0 s
ACCEL. INTERSECT
@
STALL CURRENT @
100%
SAFE STALL TIME @
100% Vline: 10.0
ACCEL. INTERSECT
@
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 0.5 to 99999.9 s in steps of 0.1
Range: 70 to 95% in steps of 1
Range: 2.00 to 15.00 x FLA in steps of
0.01
Range: 0.5 to 999.9 s in steps of 0.1
Range: 2.00 to
STALL CURRENT @ MIN
– 0.01 in steps of 0.01
VLINE
Range: 2.00 to 15.00 x FLA in steps of
0.01
Range: 0.5 to 999.9 s in steps of 0.1
Range: 2.00 to
STALL CURRENT @ MIN
– 0.01 in steps of 0.01
VLINE
5–47
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