YASKAWA P1000 Quick Start Manual page 251

L1-01: Motor Overload Protection Selection
n
The drive has an electronic overload protection function (oL1) based on time, output current, and output frequency that 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 (60 Hz default)
2 Drive duty motor with a speed range of 1:10
3 Vector motor with a speed range of 1:100
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 motor overload protection (L1-01 ≠ 0) 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.
L1-02: Motor Overload Protection Time
n
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
a hot motor 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.
Operation time (minutes)
YASKAWA ELECTRIC TOEP YAIP1U 01B YASKAWA AC Drive - P1000 Quick Start Guide
Table C.7 Overload Protection Settings
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 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.
10
7
3
1
0.4
0.1
0 100
Figure C.8 Motor Overload Protection Time
Description
Cold start
(characteristics when an
overload occurs at a
complete stop)
Hot start
(characteristics when an
overload occurs during
continuous operation at 100%)
Motor current (%)
150 200
E2-01 = 100% motor current
C.2 UL and CSA Standards
C
251