4.3 UL Standards
278 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
• 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 turns ON 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 4.22 for an example of the circuit configuration to connect more than one motor to one drive.
Figure 4.22 Protection Circuit Configuration to Connect More than One Motor to One Drive
NOTICE: When one drive is operating more than one motor at the same time or when the rated current of the motor is much
larger than rated current of a standard motor, you cannot protect the motor with electronic thermal protection. To protect each
motor, set L1-01 =0 [Motor Overload (oL1) Protection = Disabled], configure the circuits, then add thermal relays to each motor.
The magnetic contactor installed for motor protection cannot be switched ON/OFF during run. Failure to obey can cause motor
failure.
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 overload protection from low speed to high speed across the full speed range.
Load Tolerance Cooling Capability
Overload Characteristics
(at 100% motor load)
This motor is designed to operate with
commercial line power. Operate at a 60 Hz
base frequency to maximize the motor
cooling ability.
If the motor operates at frequencies less than
60 Hz, the drive will detect oL1. The drive
triggers a fault relay output and the motor
coasts to stop.
2 : Constant Torque 10:1 Speed Range
Use this setting for drive-dedicated motors with a speed range for constant torque of 1:10.
The speed control for this motor is 10% to 100% when at 100% load. Operating slower than 10% speed at 100%
load will cause motor overload.
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