YASKAWA A1000 Series Technical Manual page 517

Setting
4 Permanent Magnet motor with variable torque
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 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 D.7
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Description
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 D.7 Motor Overload Protection Time
Cold Start
Hot Start
Motor Current (%)
(E2-01=100 %)
200
D.3 UL Standards
D
517