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Overheat protection of the motor by the inverter (Pr. 9)
4.2 Overheat protection of the motor by the inverter (Pr. 9)
Set the rated motor current in Pr. 9 Electronic thermal O/L relay to protect the motor from overheat.
Parameter
Number
Name Initial Value Setting Range *2 Description
9 Electronic thermal O/L relay
Rated inverter
current
*1 *3
55K or lower
0 to 500A
Set the rated motor current.
75K or higher
0 to 3600A
*1 Refer to page 150 for the rated inverter current value.
*2 The minimum setting increments are 0.01A for the 55K or lower and 0.1A for the 75K or more.
*3 Performing IPM parameter initialization changes the settings. (Refer to page 43)
Changing example
Change the Pr. 9 Electronic thermal O/L relay setting to 2.0A according to the motor rated current.
(FR-F740P-0.75K)
CAUTION
· Protective function by electronic thermal relay function is reset by inverter power reset and reset signal input. Avoid
unnecessary reset and power-OFF.
· When two or more motors are connected to the inverter, they cannot be protected by the electronic thermal relay function.
Install an external thermal relay to each motor.
· When the difference between the inverter and motor capacities is large and the setting is small, the protective characteristics of
the electronic thermal relay function will be deteriorated. In this case, use an external thermal relay.
· A special motor cannot be protected by the electronic thermal relay function. Use an external thermal relay.
· PTC thermistor output built-in the motor can be input to the PTC signal (AU terminal). For details, refer to Chapter 4 of the
Instruction Manual (Applied).
5.Press to show the present
set value.
3.Press to choose the parameter
setting mode.
Flicker ··· Parameter setting complete!!
7.Press to set.
· Press to show the setting again.
· Press twice to show the next parameter.
· By turning , you can read another parameter.
4.Turn until " "(Pr. 9
Electronic thermal O/L relay) appears.
6.Turn to change
the set value to
1.Screen at power-ON
The monitor display appears.
2.Press to choose the PU
operation mode.
PU indicator is lit.
The parameter number
read previously appears.
Display
Operation
(2.1A for FR-740P-0.75K)
" ". (2.0A)
Refer to page
150 for initial
value of the
inverter rated
current.