n L1-01: Motor Overload Protection SelectionThe drive has an electronic overload protection function (oL1) based on time, output current, and output frequency that protectsthe motor from overheating. The electronic thermal overload function is UL-recognized, so it does not require an externalthermal relay for single motor operation.This parameter selects the motor overload curve used according to the type of motor applied.Table C.7 Overload Protection SettingsSetting Description0 Disabled Disabled the internal motor overload protection of the drive.1 Standard fan-cooled motor (60 Hz default) Selects protection characteristics for a standard self-cooled motor with limited cooling capabilitieswhen running below the rated speed. The motor overload detection level (oL1) is automaticallyreduced when running below the motor rated speed.2 Drive duty motor with a speed range of 1:10 Selects protection characteristics for a motor with self-cooling capability within a speed range of10:1. The motor overload detection level (oL1) is automatically reduced when running below1/10 of the motor rated speed.3 Vector motor with a speed range of 1:100 Selects protection characteristics for a motor capable of cooling itself at any speed including zerospeed (externally cooled motor). The motor overload detection level (oL1) is constant over theentire speed range.6 Standard fan-cooled motor (50 Hz) Selects protection characteristics for a standard self-cooled motor with limited cooling capabilitieswhen running below the rated speed. The motor overload detection level (oL1) is automaticallyreduced when running below the motor rated speed.When connecting the drive to more than one motor for simultaneous operation, disable the electronic overload protection(L1-01 = 0) and wire each motor with its own motor thermal overload relay.Enable motor overload protection (L1-01 ≠ 0) when connecting the drive to a single motor, unless another motor overloadpreventing device is installed. The drive electronic thermal overload function causes an oL1 fault, which shuts off the outputof the drive and prevents additional overheating of the motor. The motor temperature is continually calculated while the driveis powered up.n L1-02: Motor Overload Protection TimeSetting Range: 0.1 to 5.0 minFactory Default: 1.0 minParameter L1-02 determines how long the motor is allowed to operate before the oL1 fault occurs when the drive is runninga hot motor at 60 Hz and at 150% of the full load amp rating (E2-01) of the motor. Adjusting the value of L1-02 can shift theset of oL1 curves up the y axis of the diagram below, but will not change the shape of the curves.Operation time (minutes)Cold start(characteristics when anoverload occurs at acomplete stop)Hot start(characteristics when anoverload occurs duringcontinuous operation at 100%)Motor current (%)E2-01 = 100% motor current107310.40.10 100 150 200Figure C.8 Motor Overload Protection TimeC.2 UL and CSA StandardsYASKAWA ELECTRIC TOEP YAIP1U 01B YASKAWA AC Drive - P1000 Quick Start Guide 251C Standards Compliance
