3-9
3
3.5.2 Pr. 9 Electronic thermal O/L relay
Congure the current value for the electronic thermal O/L relay to enable motor overheating protection. This can
help you achieve optimal protection capability for various operating conditions such as low-speed operation and
reduced motor cooling capacity.
Pr. Name Initial value Setting range Description
9 Electronic thermal O/L relay Inverter rated current
*1
0 to 500A Set the rated motor current.
This function detects the motor overload (overheating) and trips the inverter by stopping the operation of the
transistor at the inverter output side.
● Set the rated current value (A) of the motor in Pr. 9.
(If the motor has both 50Hz and 60Hz rating and the Pr. 3 Base frequency is set to 60Hz, set the 1.1 times of
the 60Hz rated motor current.)
● Set "0" in Pr. 9 when you do not want to operate the electronic thermal O/L relay, e.g. when using an external
thermal relay with the motor. (Note that the output transistor protection of the inverter functions (E.THT).)
*1 The inverter rated current is congured to 85% for values of 0.75K or less.
Operation example
1
Screen at power-ON
The monitor display appears.
2
Changing the operation mode
Press to choose the PU operation mode. The [PU] indicator turns on.
3
Parameter setting mode
Press to choose the parameter setting mode.
4
Selecting the parameter number
Turn until (Pr. 9) is selected.
5
Reading settings
Press to read the present setting. " " (0.68A (initial value)) appears.
6
Changing the setting
Turn to change the setting to " " (0.63A).
7
Parameter settings
Press to nalize the setting.
The parameter number and setting ashes.
* Congure parameter settings in accordance with your environment.
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