Drive Motor Overload Protection - YASKAWA L1000A Technical Manual

◆ Drive Motor Overload Protection

Set parameter E2-01/E5-03 (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.
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E2-01/E5-03: Motor Rated Current (IM Motor/PM Motor)
Setting Range: Model Dependent
Default Setting: Model Dependent
Parameter E2-01/E5-03 (motor rated current) protects the motor if parameter L1-01 is not set to 0 (default is 1, enabling
protection for standard induction motors).
If Auto-Tuning has been performed successfully, the motor data entered to T1-04/T2-04 is automatically written into
parameter E2-01/E5-03. If Auto-Tuning has not been performed, manually enter the correct motor rated current to
parameter E2-01/E5-03.
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L1-01: Motor Overload Protection Selection
The drive has an electronic overload protection function (oL1) based on time, output current, and output speed, which
protects the motor from overheating. The electronic thermal overload function is UL-recognized, so it does not require an
external thermal relay for single motor operation.
This parameter selects the motor overload curve used according to the type of motor applied.
Setting
0 Disabled
1 Standard fan-cooled motor (default)
2 Drive duty motor with a speed range of 1:10
3 Vector motor with a speed range of 1:100
5 Permanent Magnet motor with constant torque
6 Standard fan cooled motor (50 Hz)
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 the motor overload protection (L1-01 = 1 to 3, 5) when connecting the drive to a single motor, unless another
motor overload preventing device is installed. The drive 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 while the drive is powered up.
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L1-02: Motor Overload Protection Time
Setting Range: 0.1 to 5.0 min
Factory Default: 1.0 min
Parameter L1-02 determines how long the motor is allowed to operate before the oL1 fault occurs when the drive is
running at 60 Hz and at 150% of the full load amp rating (E2-01/E5-03) of the motor. Adjusting the value of L1-02 can
shift the set of oL1 curves up the y axis of the diagram below, but will not change the shape of the curves.
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
Table D.7 Overload Protection Settings
Description
Disabled the internal motor overload protection of the drive.
Selects protection characteristics for a standard self cooled motor with limited cooling capabilities when running below
the rated speed. The motor overload detection level (oL1) is automatically reduced when running below the motor rated
speed.
Selects protection characteristics for a motor with self-cooling capability within a speed range of 10:1. The motor
overload detection level (oL1) is automatically reduced when running below 1/10 of the motor rated speed.
Selects protection characteristics for a motor capable of cooling itself at any speed — including zero speed (externally
cooled motor). The motor overload detection level (oL1) is constant over the entire speed range.
Selects protection characteristics for a constant torque PM motor. The motor overload detection level (oL1) is constant
over the whole speed range.
Selects protection characteristics for a standard self cooled motor with limited cooling capabilities when running below
the rated speed. The motor overload detection level (oL1) is automatically reduces when running below the motor rated
speed.
D.3 UL and CSA Standards
D
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