5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual 223
5.8 L: Protection Functions
◆ L1: Motor Protection
■ L1-01: Motor Overload Protection Selection
The drive has an electronic overload protection function that estimates the motor overload level based on output current,
output speed, thermal motor characteristics, and time. An oL1 fault will be triggered when motor overload is detected and
drive output will be shut off.
L1-01 sets the overload protection function characteristics according to the motor being used.
Note: 1. When the motor protection function is enabled (L1-01≠ 0), an oL1 alarm can be output through one of the multi-function outputs by
setting H2-01 to 1F. The output will close when the motor overload level reaches 90% of the oL1 detection level.
2. Set L1-01 to a value between 1 and 5 when running a single motor from the drive to select a method to protect the motor from
overheat. An external thermal relay is not necessary.
Setting 0: Disabled (motor overload protection is not provided)
Use this setting if no motor overheat protection is desired.
Setting 1: General-purpose motor (standard self-cooled)
Because the motor 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.
No. Parameter Name Setting Range Default
L1-01 Motor Overload Protection Selection 0 to 3, 5 Determined by A1-02
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.
Rated Speed = 100% Speed
A: Max. speed for 200LJ and above
B: Max. speed for 160MJ to 180 LJ
C: Max. speed for 132MJ and below
150
100
90
60
50
60 s
Continuous
A
B
C
05 33 100120 167 200
Speed (%)
Torque (%)
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