Drive Motor Overload Protection - YASKAWA T1000V Technical Manual

D.3 UL Standards
Drive Short-Circuit Rating
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This drive is suitable for use on a circuit capable of delivering not more than 30,000 RMS symmetrical amperes, 480 V
ac maximum (Up to 240 V in 200 V class drives, up to 480 V for 400 V class drives), when protected by fuses as
specified in Table D.5.

◆ Drive Motor Overload Protection

Set parameter E2-01 (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.
E2-01 Motor Rated Current
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Setting Range: Model Dependent
Default Setting: Model Dependent
Parameter E2-01 (motor rated current) protects the motor if parameter L1-01 is not set to 0 (default is 1, standard
induction motor protection enabled).
If Auto-Tuning has been performed successfully, the motor data that was entered in T1-04 is automatically written into
parameter E2-01. If Auto-Tuning has not been performed, manually enter the correct motor rated current in parameter
E2-01.
L1-01 Motor Overload Protection Selection
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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.
Setting
0
1
2
3
4
Disable the electronic overload protection (L1-01 = 0: Disabled) and wire each motor with its own motor thermal
overload when connecting the drive to more than one motor for simultaneous operation.
Enable the motor overload protection (L1-01 = "1", "2", or "3") when connecting the drive to a single motor unless there
is another means of preventing motor thermal overload. The electronic thermal overload function causes an oL1 fault,
which shuts off the output of the drive and prevents additional overheating of the motor. The motor temperature is
continually calculated as long as the drive is powered up.
Setting L1-01 = 1 selects a motor with limited cooling capability below rated (base) speed when running at 100% load.
The oL1 function derates the motor when it is running below base speed.
Setting L1-01 = 2 selects a motor capable of cooling itself over a 10:1 speed range when running at 100% load. The oL1
function derates the motor when it is running at 1/10 or less of its rated speed for variable torque.
Setting L1-01 = 3 selects a motor capable of cooling itself at any speed — including zero speed — when running at 100%
load. The oL1 function does not derate the motor at any speed.
Setting L1-01 = 4 selects protection for a PM motor for derated torque.
418
Table D.7 Overload Protection Settings
Disabled
Standard fan cooled motor (default)
Drive duty motor with a speed range of 1:10
Vector motor with a speed range of 1:100
Permanent Magnet motor with variable torque
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Description