57
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
Description
9
Electronic thermal O/L relay
Inverter rated
0 to 500A
Set the rated motor current.
*1
Refer to
page 174
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 currently
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 powering on
The monitor display appears.
2.
Press to choose PU operation
mode.
PU indication is lit.
The parameter number
read previously appears.
Display
Operation
(24A for FR-A721-5.5K)
Refer to
page
for initial
value of the
inverter rated
current.
Summary of Contents for FR-A741-11K
Page 7: ...MEMO ...
Page 216: ...209 MEMO ...
