Mitsubishi Electric FR-D720S SC EC, Инструкция по эксплуатации

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Parameter Selection and protection of a motor
FR-D700 SC EC 6 - 67
Electronic thermal O/L relay (Pr. 9)
Set the rated current [A] of the motor in Pr. 9. (When the power supply specification is 400V/
440V 60Hz, 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, 50 or 53" 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 re-
gion 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.
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 6Hz or higher.
I002012E
Fig. 6-33: Electronic thermal relay function operation characteristic
Inverter output current (%)
(% to the rated inverter current)
(s) unit displa
y in
this region
(min) unit displa
y
in this region
Pr. 9 = 50% setting of
the inverter rating %
Pr. 9 = 100% setting of
the inverter rating
Range for
transistor
protection
or more
Characteristic when electronic thermal
relay function for motor protection is
turned off (When Pr. 9 setting is 0).
or more
Operation range
– Range on the right of
characteristic curve
Non operation range
– Range on the left of
characteristic curve
Oper
ation time (min)
Oper
ation time (s)