YASKAWA L1000H Quick Start Manual page 49

 L1-01 Motor Overload Protection Selection
The drive has an electronic overload protection function (OL1) based on time, output cur-
rent, and output frequency, which protects the motor from overheating. The electronic ther-
mal 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
3
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, 2, or 3) when connecting the drive to a sin-
gle motor unless there is another means of preventing motor thermal overload. The elec-
tronic 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 cal-
culated 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 any time it is running
below base speed.
Setting L1-01 = 2 selects a motor capable of cooling itself over a 10:1 speed range when run-
ning at 100% load. The OL1 function derates the motor when it is running at 1/10 or less of
its rated speed.
Setting L1-01 = 3 selects a motor capable of cooling itself at any speed  including zero
speed  when running at 100% load. The OL1 function does not derate the motor at any
speed.
YASKAWA Europe TOEP C710606 91B AC Drive L1000H - Quick Start Guide
Overload Protection Settings
Disabled
Standard fan cooled motor (default)
Inverter duty motor with a speed range of 1:10
Vector motor with a speed range of 1:100
8 Instructions for UL and cUL
Description
EN 49