A-4
Appendix-A Instructions for UL
◆ Drive Motor Overload Protection
Set parameter 02-01 (motor rated current) to the appropriate value to enable motor overload protection. The internal motor
overload protection is UL listed and in accordance with the NEC and CEC.
■ 02-01 Motor Rated Current
Setting Range: Model Dependent
Factory Default: Model Dependent
The motor rated current parameter (02-01) protects the motor and allows for proper vector control when using open loop vector or
flux vector control methods (00-00 = 2 or 3). The motor protection parameter 08-05 is set as factory default. Set 02-01 to the full
load amps (FLA) stamped on the nameplate of the motor.
The operator must enter the rated current of the motor (17-02) in the menu during auto-tuning. If the auto-tuning operation
completes successfully (17-00 = 0), the value entered into 17-02 will automatically write into 02-01.
■ 08-05 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.
Overload Protection Settings
Setting Description
---0B Motor Overload Protection is disabled
---1B Motor Overload Protection is enabled
--0-B Cold Start of Motor Overload
--1-B Hot Start of Motor Overload
-0--B Standard Motor
-1--B Special motor
Sets the motor overload protection function in 08-05 according to the applicable motor.
Setting 08-05 = ---0B. Disables the motor overload protection function when two or more motors are connected to a single inverter.
Use an alternative method to provide separate overload protection for each motor such as connecting a thermal overload relay to the
power line of each motor.
Setting 08-05 = --1-B. The motor overload protection function should be set to hot start protection characteristic curve when the
power supply is turned on and off frequently, because the thermal values are reset each time when the power is turned off.
Setting 08-05 = -0--B. For motors without a forced cooling fan (general purpose standard motor), the heat dissipation capability is
lower when in low speed operation.
Setting 08-05 = -1--B. For motors with a forced cooling fan (inverter duty or V/F motor), the heat dissipation capability is not
dependent upon the rotating speed.
To protect the motor from overload by using electronic overload protection, be sure to set parameter 02-01 according to the rated
current value shown on the motor nameplate.
Refer to the following "Motor Overload Protection Time" for the standard motor overload protection curve example : Setting 08-05 = -0--B.
Motor Overload Protection Time
■
08-06 Start-up mode of overload protection operation
Setting
Description
0 Stop Output after Overload Protection
1 Continuous Operation after Overload Protection
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