6-34
The following diagram 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 6.24 Motor Protection Operation Time
Setting Precautions
• If multiple motors are connected to one inverter, set constant L1-01 to 0 (disabled). To protect each of the
motors, use a control circuit that switches off the inverter output when one of the motors overheats.
• With applications where the power supply is often turned ON and OFF, there is a risk that the motor can-
not be protected even if this constant has been set to 1 (enabled), because the thermal value will be reset
after inverter power supply switch off.
• For safe overload tripping, set the value in constant L1-02 to a low setting.
Setting the Motor Overload Pre-Alarm
To enable the Motor overload pre-alarm enable the motor overload protection function (i.e., L1-01 must be set
set to 1) and set H2-01 or H2-02 (multi-function output terminals M1-M2 and M3-M4 function selection) to
1F (motor overload OL1 pre-alarm). If the electronic thermal value reaches minimum 90% of the overload
detection level, the output terminal that has been set will be turned ON.
Operating time (min.)
Cold start
Hot start
Motor current (%)
(E2-01 is set to 100%)
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