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5.7 L: Protection Functions

L1: Motor Protection Functions

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.

No. Name Setting Range Default

L1-01 Motor Overload Protection Selection 0 to 2 1

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

Drive

Power

supply

MC1

MC1, MC2: Magnetic contactors

L10, L20: Thermal relays

L10

MC2 L20

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.

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.

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.

5.7 L: Protection Functions

YASKAWA ELECTRIC SIEP C710606 31A YASKAWA AC Drive – J1000 Technical Manual

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