YASKAWA T1000A Technical Manual page 213

Setting 5: Constant torque PM motors (constant torque range of 1:500)
Sets protection characteristics needed when driving a PM with constant torque. These motors allow for a speed control
from 0.2% to 100% when operating with 100% load. Slower speeds with 100% load will trigger overload.
Overload Tolerance
Instantaneous rating (60 s)
150
125
115
100
83
77
67
0 0.2
Percent of base speed (%)
Setting 6: General-purpose motor (50 Hz)
Because the motor (50 Hz) is self-cooled, the overload tolerance drops when the motor speed is lowered. The drive
appropriately adjusts the electrothermal trigger point according to the motor overload characteristics, protecting the
motor from overheat throughout the entire speed range.
Overload Tolerance
150
Rated Speed=100% Speed
60 s
A: Max. speed for 200LJ and above
B: Max. speed for 160MJ to 180 LJ
C: Max. speed for 132MJ and below
100
90
Continuous
50
A
B
05 33 100 120 167 200
Speed (%)
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
100 120 130 150
C
Cooling Ability
Motor is designed to effectively cool itself at ultra-
low speeds (about 0.2% of base speed).
Cooling Ability
Motor designed to operate from line power.
Motor cooling is most effective when running at
rated base frequency (check the motor nameplate or
specifications).
5.8 L: Protection Functions
Overload Characteristics
Continuous operation with 100% load from 0.2% to
100% of base speed.
Overload Characteristics
Continuous operation at less than line power
frequency with 100% load can trigger motor
overload protection (oL1). A fault is output and the
motor will coast to stop.
5
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