L: Protection Functions; L: Protection Functions; L1: Motor Protection Functions - YASKAWA J1000 Technical Manual

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.
No.
L1-01
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
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
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.
112
Name
Motor Overload Protection Selection
Drive
Power
supply
Figure 5.33 Example of Protection Circuit Design for Multiple Motors
Motor designed to operate from line
power.
Motor cooling is most effective when
running at rated nameplate base
frequency (check the motor
specifications).
http://nicontrols.com
Figure 5.33
MC1 L10
MC2 L20
MC1, MC2: Magnetic contactors
L10, L20: Thermal relays
Cooling Ability
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
Setting Range
0 to 2
M1
M2
Overload Characteristics
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.
Default
1