YASKAWA CIMR-JA Series Installation & Start-Up Manual page 239

n L1-01 Motor Overload Protection Selection
The drive has an electronic overload protection function (oL1) based on time, output current
and output frequency, which protects the motor from overheating. The electronic thermal
overload function is UL-recognized, so it does not require an external thermal overload relay
for single motor operation.
This parameter selects the motor overload curve used according to the type of motor applied.
Setting
0
1
2
Disable the electronic overload protection (L1-01 = 0: Disabled) and wire each motor with its
own motor thermal overload when connecting the drive to more than one motor for
simultaneous operation.
Enable the motor overload protection (L1-01 = "1" or "2") when connecting the drive to a
single motor unless there is another means of preventing motor thermal overload. The
electronic thermal overload function causes an oL1 fault, which shuts off the output of the
drive and prevents additional overheating of the motor. The motor temperature is continually
calculated as long as the drive is powered up.
Setting L1-01 = 1 selects a motor with limited cooling capability below rated (base) speed
when running at 100% load. The oL1 function derates the motor when it is running below
base speed.
Setting L1-01 = 2 selects a motor capable of cooling itself over a 10:1 speed range when
running at 100% load. The oL1 function derates the motor when it is running at 1/10 or less
of its rated speed.
n L1-02 Motor Overload Protection Time
Setting Range: 0.1 to 5.0 Minutes
Factory Default: 1.0 Minutes
The L1-02 parameter sets the allowed operation time before the oL1 fault occurs when the
drive is running at 60 Hz and 150% of the full load amp rating (E2-01) of the motor. Adjusting
the value of L1-02 can shift the set of oL1 curves up the Y-axis of the diagram below but will
not change the shape of the curves.
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
Table C.7 Overload Protection Settings
Disabled
Std Fan Cooled (< 10:1 motor) (default setting)
Standard Blower Cooled (10:1 motor)
C.3 UL Standards
Description
C
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