5.7 L: Protection Functions 5.7 L: Protection Functions u L1: Motor Protection Functions n L1-01: Motor Overload Protection Function Selection The drive has an electronic overload protection function that estimates the motor overload level based on output current, output frequency, thermal motor characteristics, and time. An oL1 fault will be triggered when motor overload is detected. L1-01 sets the overload protection function characteristics according to the motor being used. Setting 0: Disabled - Motor Overload Protection is not Provided This setting should be used if no motor overheat protection is desired or if multiple motors are connected to one drive.
In this case it is recommended that you install a thermal relay for each motor as show in Figure 5.33 Power supply MC1, MC2: Magnetic contactors L10, L20: Thermal relays Figure 5.33 Example of Protection Circuit Design for Multiple Motors NOTICE: Protect each motor with individual thermal overloads when multiple motors are connected to one drive. Failure to comply could result in motor damage. Disable the electronic overload protection of the drive (L1-01 = “0: Disabled”) and protect each motor with individual motor thermal overloads. Setting 1: General Purpose Motor (standard self-cooled) Because the motor is self-cooled, the overload tolerance drops when the motor speed is lowered.
The drive appropriately adjusts the electrothermal trigger point according to the motor overload characteristics, protecting the motor from overheat throughout the entire speed range. Setting 2: Drive Dedicated Motor (constant torque, 1:10) Use this setting when operating a drive duty motor with a torque ratio of 1:10. This motor type is allowed to run with 100% load from 10% up to 100% speed. Running slower speeds with full load can trigger an overload fault. 102 SIEP C710606 33A OYMC AC Drive – J1000 User Manual No.
Name Setting Range Default L1-01 Motor Overload Protection Selection 0 to 2 1 Drive M1 MC1 L10 M2 MC2 L20 Drive Overload Tolerance Overload Characteristics Cooling Ability Motor designed to operate from line power. Motor cooling is most effective when running at rated nameplate base frequency (check the motor specifications). Continuous operation at less than line power frequency with 100% load can trigger motor overload protection (oL1). A fault is output and the motor will coast to stop.