D.3 UL and CSA Standards
♦ 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.
■ 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.
■ 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 o f motor applied.
Table D.6 Overload Protection Settings
Setting
Description
0
Disabled
Disabled the internal motor overload protection o f the drive.
1
Standard fan-cooled motor (default)
Selects protection characteristics for a standard s e lf cooled motor with lim ited cooling capabilities when running below
the rated speed. The motor overload detection level (oL 1) is automatically reduced when running below the motor rated
speed.
2
Drive duty motor with a speed range o f 1:10
Selects protection characteristics for a motor with self-cooling capability within a speed range o f 10:1. The motor
overload detection level (oL 1) is automatically reduced when running below 1/10 o f the motor rated speed.
3
Vector motor with a speed range o f 1:100
Selects protection characteristics for a motor capable o f cooling itself at any speed — including zero speed (externally
cooled motor). The motor overload detection level (oL 1) is constant over the entire speed range.
5
Permanent Magnet motor with constant torque
Selects protection characteristics for a constant torque PM motor. The motor overload detection level (oL1) is constant
over the w hole speed range.
6
Standard fan cooled motor (50 Hz)
Selects protection characteristics for a standard se lf 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.
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 o f the drive and prevents additional overheating o f the motor. The motor temperature is continually
calculated while the drive is powered up.
■ 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) o f the motor. Adjusting the value o f L1-02 can
shift the set o f oL1 curves up the y axis of the diagram below, but will not change the shape o f the curves.
F ig u r e D.9 M o to r O v e r lo a d P r o te c ti o n T im e
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
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