YASKAWA A1000 Series Quick Start Manual page 190

C Standards Compliance
L1-01 Motor Overload Protection Selection
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 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)
Drive duty motor with a speed range of
2
1:10
3 Vector motor with a speed range of 1:100
Permanent Magnet motor with variable
4
torque
Permanent Magnet motor with constant
5
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 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 as long as 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) 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.
Figure 92
190
Table 70 Overload Protection Settings
Description
Disabled the drive's internal motor overload protection.
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.
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 variable torque PM motor. The motor overload
detection level (oL1) is automatically reduces when running below the motor rated speed.
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.
Time (min)
10
7
3
1
0.4
0.1
0 100 150
Figure 92 Motor Overload Protection Time
YASKAWA ELECTRIC TOEP C710616 21C YASKAWA AC Drive - A1000 Quick Start Guide
Cold Start
Hot Start
Motor Current (%)
(E2-01=100 %)
200