Chapter 12 Description of Parameter Settings
MH300
12.1-14-24
The electronic thermal relay action condition follows the settings for Pr.14-80 /Pr.14-82:
1. Pr.14-80 / Pr.14-82 set to 0 (inverter motor with external forced cooling):
When the drive output current is higher than 150% of the rated current for the motor (refer to the
motor independent cooling curve figure above), the drive starts to count the time. If the time
exceeds the settings for Pr.14-81 / Pr.14-83, the electronic thermal relay is activated.
2. Pr.14-80 / Pr.14-82 set to 1 (standard motor with fan on the shaft):
When the drive output current is higher than 150% of the rated current of the motor (refer to the
motor coaxial cooling curve figure above), the drive starts to count the time. If the time exceeds
the settings for Pr.14-81 / Pr.14-83, the electronic thermal relay activates. The electronic thermal
relay action time depends on the drive output current (motor loading rate in %) to make
appropriate adjustments: short action time when the current is high, long action time when the
current is low. See the figure below:
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