Parameter Details
12
12.7 L: Protection Functions
YASKAWA SIEPYEULA5001C LA500 Technical Manual 327
12.7 L: Protection Functions
L parameters set the following functions.
• Motor Overload Protection
• Operation During Momentary Power Loss
• Stall Prevention
• Speed Detection
• Auto Restart
• Detection of Overtorque/Undertorque
• Torque Limit
• Hardware Protection
◆ L1: Motor Protection
L1 parameters set the motor overload protection function.
■ L1-01: Motor Overload (oL1) Protection
No.
(Hex.)
Name Description
Default
(Range)
L1-01
(0480)
Motor Overload (oL1)
Protection
Sets the motor overload protection with electronic thermal protectors.
1
(0 - 3)
This parameter enables and disables the motor overload protection with electronic thermal protectors.
The cooling capability of the motor changes when the speed control range of the motor changes. Use an electronic
thermal protector that aligns with the permitted load characteristics of the motor to select motor protection.
The electronic thermal protector of the drive uses these items to calculate motor overload tolerance and supply
overload protection for the motor:
• Output Current
• Output Frequency
• Motor thermal characteristics
• Time characteristics
If the drive detects motor overload, the drive will trigger an oL1 [Motor Overload] and stop the drive output.
Set H2-01 = 1F [Term MA/MB-MC Function Selection = Motor Overload Alarm (oL1)] to set a motor overload
alarm. If the motor overload level is more than 90% of the oL1 detection level, the output terminal activates and
triggers an overload alarm.
0 : Disabled
Disable motor protection when motor overload protection is not necessary or when the drive is operating more
than one motor.
Refer to Figure 12.26 for an example of the circuit configuration to connect more than one motor to one drive.
Figure 12.26 Protection Circuit Configuration to Connect More than One Motor to One Drive
NOTICE: When you connect more than one motor to one drive or when the motor amp rating is higher than the drive amp
rating, set L1-01 =0 [Motor Overload (oL1) Protection = Disabled] and install thermal overload relays for each motor. The
electronic thermal protection of the drive will not function and it can cause damage to the motor.
1 : Variable Torque
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