Mitsubishi Electric FR-E700 Instruction Manual page 237
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- Instruction manual (538 pages) ,
- Basic instruction manual (149 pages) ,
- Installation manuallines (38 pages)
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Parameter
Electronic thermal O/L relay (Pr. 9)
Set the rated current [A] of the motor in Pr. 9. (When the power supply specification is 400 V/440 V
60 Hz, set the 1.1 times the rated motor current.)
Set "0" to Pr. 9 when you do not want to activate the electronic thermal relay function, e.g. when using
an external thermal relay with the motor. (Note that the output transistor protection of the inverter
functions (E.THT).)
When using the Mitsubishi constant-torque motor set "1, 13 to 16, 50, 53 or 54" to Pr. 71. (This provides
a 100% continuous torque characteristic in the low-speed range.) After this set the rated current of the
motor to Pr. 9.
The figure below shows the electronic thermal relay function operation characteristic. The region on
the right of the characteristic curve is the operation region. The region on the left of the characteristic
curve is the non-operation region.
Fig. 6-36: Electronic thermal relay function operation characteristic
When a value 50% of the inverter rated output current (current value) is set to Pr. 9.
The % value denotes the percentage to the inverter rated output current. It is not the percentage
to the motor rated current.
When you set the electronic thermal relay function dedicated to the Mitsubishi constant-torque
motor, this characteristic curve applies to operation at 6 Hz or higher.
FR-E700 SC EC/ENE
Pr. 9 = 50% setting of
the inverter rating %
or more
Inverter output current (%)
(% to the rated inverter current)
Selection and protection of a motor
Pr. 9 = 100% setting of
the inverter rating
or more
Operation range
– Range on the right of characteristic curve
Non operation range
– Range on the left of characteristic curve
Characteristic when electronic thermal
relay function for motor protection is
turned off (When Pr. 9 setting is 0 (A)).
Range for
transistor
protection
I001792E
6 - 83
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