Overheat Protection Of The Motor By The Inverter (Pr. 9) - Mitsubishi Electric FR-F 700 EC Instruction Manual

Overheat protection of the motor by the inverter (Pr. 9)

3.3 Overheat protection of the motor by the inverter (Pr. 9)

Set this parameter when using a motor other than the Mitsubishi standard motor (SF-JR) and Mitsubishi
constant torque motor (SF-HRCA).
Set the rated motor current in Pr. 9 Electronic thermal O/L relay to protect the motor from overheat.
Parameter
Number
9 Electronic thermal O/L relay
*1 Refer to page 90 for the rated inverter current value.
*2 The minimum setting increments are 0.01A for the
Changing example
Change the Pr. 9 Electronic thermal O/L relay setting to 2.5A according to the motor rated current.
(FR-F740-00023)
1.
Screen at powering on
The monitor display appears.
2.
Press
operation mode.
3.
Press
setting mode.
4.
Turn
thermal O/L relay appears.
5.
Press
set value.
6.
Turn
the set value to
7.
Press
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
Manual (applied).
32
Name Initial Value
Rated inverter
output current
01160 or less and 0.1A for the
Operation
to choose the PU
to choose the parameter
until Pr. 9 Electronic
to show the currently
(2.3A for FR-F740-00023)
to change
" ". (2.5A)
to set.
By turning , you can read another parameter.
·
Press to show the setting again.
·
Press twice to show the next parameter.
·
Setting Range
01160 or less 0 to 500A
0 to 3600A
*1 01800 or more
01800 or more.
Display
PU indication is lit.
Flicker Parameter setting complete!!
···
Description
*2
Set the rated motor current.
The parameter number
read previously appears.
Refer to page
90 for initial
value of the
inverter rated
current.
Instruction