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Setting Motor Overload Protection Characteristics (L1-01)
Set the overload protection function in L1-01 according to the used motor.
As the motors thermal behavior depends on the motor type, the thermal motor protection characteristics must
be properly selected.
Set L1-01 to:
0: to disable the thermal motor protection function.
1: to enable the thermal motor protection for a fan cooled general purpose motor (self-cooled).
2: to enable the thermal motor protection for an inverter motor (externally cooled).
3: to enable the thermal motor protection for a special vector motor (externally cooled).
5: to enable the thermal motor protection for a permanent magnet motor
Setting Motor Protection Operation Time (L1-02)
The motor protection operation time is the time for that the motor can handle a 150% overload when it was
running with the rated load before (i.e. operating temperature was reached before applying the 150% over-
load). Set the motor protection operation time in L1-02. The factory setting is 60 sec.
Fig 6.19 shows an example of the characteristics of the electronic thermal protection operation time (L1-02 =
1.0 min., operation at 50 Hz, general-purpose motor characteristics, when L1-01 is set to 1)
Fig 6.19 Motor Protection Operation Time
Setting a Motor Overload Pre-Alarm
If the motor overload protection function is enabled (i.e., L1-01 is set to a value different from 0) and H2-01 to
H2-03 (output terminals M1-M2, M3-M4, and M5-M6 function selection) to 1F (motor overload OL1 pre-
alarm), the motor overload pre-alarm will be output at the selected terminals. If the electronic thermal value
reaches minimum 90% of the overload detection level, the output terminal that has been set will be turned ON.
Operation time (min.)
Cold start
Hot start
Motor current (%)
E2-01 is set to 100%
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