5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 269
Setting 5: Constant torque PM motors (constant torque range of 1:1500)
Sets protection characteristics needed when driving a PM with constant torque. These motors allow for a speed control
from 0.07% to 100% when operating with 100% load. Running the motor below 0.07% speed with 100% load will
trigger an overload fault.
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.
L1-02: Motor Overload Protection Time
This setting rarely requires adjustment. Sets the time it takes the drive to detect motor overheat due to overload. If the
motor overload tolerance protection time when an overload of 150% is imposed after continuous operation at 100% is
clear, set that time as the value.
Defaulted to operate with an allowance of 150% overload operation for one minute in a hot start; after continuous
operation at 100%.
• Figure 5.90 shows an example of the electrothermal protection operat
ion time using a general-purpose motor
operating at 50 Hz with L1-02 set to one minute.
Motor overload protection operates in the area between a cold start and a hot start.
• Cold start: Characteristics of motor protection operation time in response to
an overload situation that was suddenly
reached when starting a stationary motor.
• Hot start: Characteristics of motor protect
ion operation time in response to an overload situation that occurred while
the motor was operating continuously at or below its rated current.
Overload Tolerance Cooling Ability Overload Characteristics
Motor is designed to effectively cool itself at
ultra-low speeds (about 0.07% of base speed).
Continuous operation with 100% load from 0.07% to
100% of base speed.
Overload Tolerance Cooling Ability Overload Characteristics
Motor designed to operate from line power.
Motor cooling is most effective when running at
rated base frequency (check the motor nameplate or
specifications).
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.
No. Name Setting Range Default
L1-02 Motor Overload Protection Time 0.1 to 5.0 minutes 1.0 minutes
Percent of base speed (%)
0 0.07 100 130 150
150
100
115
77
67
Instantaneous rating (60 s)
125
83
120
Continuous
Torque (%)
A: Max. speed for 200LJ and above
B: Max. speed for 160MJ to 180 LJ
C: Max. speed for 132MJ and below
A
B
C
100 120 167 20005 33
Speed (%)
Torque (%)
100
90
150
60 s
50
Rated Speed = 100% Speed
Continuous
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