YASKAWA GA800 Technical Reference page 295

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L1-01: Motor Overload (oL1) Protection
No.
Name
(Hex.)
L1-01 Motor Overload (oL1)
Protection
(0480)
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 M1-M2 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 : Disable
Disable motor protection when motor overload protection is not necessary or when the drive is operating more than
one motor.
Refer to Figure 5.25 for an example of the circuit configuration to connect more than one motor to one drive.
Figure 5.25 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
Use this setting for general-purpose motors with a 60 Hz base frequency.
The overload tolerance decreases as motor speed decreases because the cooling fan speed decreases and the ability of
the motor to cool decreases in the low speed range.
The overload tolerance characteristics of the motor change the trigger point for the electronic thermal protector. This
provides motor overheat protection from low speed to high speed across the full speed range.
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
V/f CL-V/f OLV CLV AOLV
Sets the motor overload protection with electronic thermal protectors.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
5.3 UL Standards
Default
(Range)
Determined by A1-02
(0 - 6)
5
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