5.8 L: Protection Functions
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.
No.
Name
Setting Range
Default
L1-01
Motor Overload Protection Selection
0 to 3; 5
Determined by A 1-02
Note: 1. W hen the m otor protection function is enabled (L1-01^ 0), an oL1 alarm can be output through one o f the multi-function outputs by
setting H2-01 to 1F. The output will close w hen the m otor overload level reaches 90% o f the oL1 detection level.
2. Set L1-01 to a value between 1 and 5 when running a single m otor from the drive to select a method to protect the m otor from
overheat. A n external thermal relay is not necessary.
Setting 0: Disabled (m otor overload protection is not provided)
Use this setting if no motor overheat protection is desired.
Setting 1: General-purpose m otor (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.
Overload Tolerance
Cooling Ability
Overload Characteristics
T
or
qu
e
(%
)
56
90
5
o
o
o
o
°
C(
60 s
\ Kated Speed = 100% Speed
i \
A: Max. speed for 200LJ and above
! \ B: Max. speed for 160MJ to 180 LJ
^ \
! \ C: Max. speed for 132MJ and below
jntinuous!
Nv
!и Ы
i
y C
Motor designed to operate from line power.
Motor cooling is m ost 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 w ill coast to stop.
05 33
100120 167 200
Speed (%)
Setting 2: Drive dedicated m otor (speed range fo r constant torque: 1:10)
Use this setting when operating a drive duty motor that allows constant torque in a speed range o f 1:10. The drive will
allow the motor to run with 100% load from 10% up to 100% speed. Running at slower speeds with full load can trigger
an overload fault.
_______________________________________________________________________________________________
a
Overload Tolerance
Cooling Ability
Overload Characteristics
Co100
e
rq
^ 55
50
60 s
Kated Speed=100% Speed
A: Max. speed for 200LJ and above
N B: Max. speed for 160MJ to 180 LJ
C: Max. speed for 132MJ and below
Continuous
A
_
s
B
C
/
Motor is designed to effectively cool itself even at
low speeds.
Continuous operation w ith 100% load from 5 H z to
50 Hz.
01 10
100120 167 200
Speed (%)
YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
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