5.8 L: Protection Functions
214 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
n L1-02: Motor Overload Protection Time
Sets the time it takes the drive to detect motor overheat due to overload. This setting rarely requires adjustment, but
should correlate with the motor overload tolerance protection time for performing a hot start.
Defaulted to operate with an allowance of 150% overload operation for one minute in a hot start.
• Figure 5.78 shows an example of the electrothermal protection operation time using a general-purpose motor
operating at 50 Hz with L1-02 set to one minute.
During normal operation, motor overload protection operates in the area between a cold start and a hot start.
• Cold start: Motor protection operation time in response to an overload situation that was suddenly reached when
starting a stationary motor.
• Hot start: Motor protection operation time in response to an overload situation that occurred during sustained
operation at rated current.
Figure 5.78
Figure 5.78 Motor Protection Operation Time
No. Name Setting Range Default
L1-02 Motor Overload Protection Time 0.1 to 5.0 minutes 1.0 minutes
Operation time (minutes)
Cold start
Hot start
Motor current (%)
E2-01 = 100% motor current
10
7
3
1
0.4
0.1
0 100 150 200
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