YASKAWA U1000 Series Technical Manual page 607

Setting
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 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 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 (50 Hz for CIMR-UB only) 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.11
■ L1-03 Motor Overheat Alarm Operation Selection (PTC Input)
Setting
0 Ramp to Stop
1 Coast to Stop
2 Fast-Stop
3
Alarm Only (default setting)
■ L1-04 Motor Overheat Fault Operation Selection (PTC Input)
Setting
0 Ramp to Stop
1 Coast to Stop (default setting)
2 Fast-Stop
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
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.
Operation time (minutes)
10
7
3
1
0.4
0.1
0 100
Figure D.11 Motor Overload Protection Time
Description
Cold start
Hot start
Motor current (%)
150 200
E2-01 = 100% motor current
Description
Description
D.3 UL Standards
D
607