YASKAWA GA800 Technical Reference page 298

5.3 UL Standards
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L1-02: Motor Overload Protection Time
No.
Name
(Hex.)
L1-02 Motor Overload Protection
Time
(0481)
Set the overload tolerance time to the length of time that the motor can operate at 150% load from continuous
operation at 100% load.
When the motor operates at 150% load continuously for 1 minute after continuous operation at 100% load (hot start),
the default setting triggers the electronic thermal protector.
Figure 5.26 shows an example of the electronic thermal protector operation time. Motor overload protection operates
in the range between a cold start and a hot start.
This example shows a general-purpose motor operating at the base frequency with L1-02 set to 1.0 min.
• Cold start
Shows the motor protection operation time characteristics when the overload occurs immediately after starting
operation from a complete stop.
• Hot start
Shows the motor protection operation time characteristics when overload occurs from continuous operation below
the motor rated current.
Figure 5.26 Protection Operation Time for a General-purpose Motor at Rated Output Frequency
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L1-03: Motor Thermistor oH Alarm Select
No.
Name
(Hex.)
L1-03 Motor Thermistor oH Alarm
Select
(0482)
0 : Ramp to Stop
The drive ramps the motor to stop in the deceleration time. Fault relay output terminal MA-MC turns ON, and MB-
MC turns OFF.
1 : Coast to Stop
The output turns off and the motor coasts to stop. Fault relay output terminal MA-MC turns ON, and MB-MC turns
OFF.
2 : Fast Stop (Use C1-09)
The drive stops the motor in the deceleration time set in C1-09 [Fast Stop Time]. Fault relay output terminal MA-MC
turns ON, and MB-MC turns OFF.
3 : Alarm Only
298
V/f CL-V/f OLV CLV AOLV
Sets the operation time for the electronic thermal protector of the drive to prevent damage to the
motor. Usually it is not necessary to change this setting.
V/f CL-V/f OLV CLV AOLV
Sets drive operation when the PTC input signal entered into the drive is at the oH3 [Motor Overheat
Alarm] detection level.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Default
(Range)
1.0 min
(0.1 - 5.0 min)
Default
(Range)
3
(0 - 3)