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Before operation
4
DRIVING THE MOTOR
4.3.2 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
Inverter rated
current
*1
0 to 500A Set the rated motor current.
*1 Refer to page 182 for the rated inverter current value.
*2 The minimum setting increments are 0.01A.
Changing example
Change the Pr. 9 Electronic thermal O/L relay setting to 22A according to the motor rated current.
(FR-A721-5.5K)
REMARKS
· Since a thermal protector is provided for a vector control dedicated motor (SF-V5RU), set "0" in Pr. 9.
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).
" ". (22A)
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 PU operation
mode.
PU indicator is lit.
The parameter number
read previously appears.
Display
Operation
(24A for FR-A721-5.5K)
Refer to page
182 for initial
value of the
inverter rated
current.