YASKAWA U1000 Series - Page 607

D.3 UL Standards
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual 607
Standards Compliance
D
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
Figure D.11 Motor Overload Protection Time
■ L1-03 Motor Overheat Alarm Operation Selection (PTC Input)
■ L1-04 Motor Overheat Fault Operation Selection (PTC Input)
5 Permanent Magnet motor with constant torque
Selects protection characteristics for a constant torque PM motor. The motor overload detection level (oL1) is constant
over the whole speed range.
6 Standard fan cooled motor (50 Hz)
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.
Setting Description
0 Ramp to Stop
1 Coast to Stop
2 Fast-Stop
3 Alarm Only (default setting)
Setting Description
0 Ramp to Stop
1 Coast to Stop (default setting)
2 Fast-Stop
Setting Description
Operation time (minutes)
Cold start
Hot start
Motor current (%)
E2-01 = 100% motor current
10
7
3
1
0.4
0.1
0 100 200150
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