YASKAWA U1000 iQpump MATRIX Drive User Manual page 421

n L1-01: Motor Overload Protection Selection
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 (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 = 1 to 3, 6) 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.
n 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
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)
n
L1-03: Motor Overheat Alarm Operation Selection (PTC input)
Sets the drive operation when the PTC input signal reaches the motor overheat alarm level (oH3).
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
Table D.5 Overload Protection Settings
10
7
3
1
0.4
0.1
0 100
Figure D.2 Motor Overload Protection Time
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 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.
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
D.2 UL Standards
D
421