Mitsubishi Electric FR-D720S SC EC, Instruction Manual, Page: 279 / 512

Parameter Operation selection at power failure
FR-D700 SC EC 6 - 129
Frequency search gain (Pr. 298), offline auto tuning (Pr. 96)
When automatic restart after instantaneous power failure operation (with frequency search) is
valid at V/f control, perform offline auto tuning. Perform offline auto tuning during V/f control in
the following order to set Pr. 298 "Frequency search gain" automatically. (Refer to page 6-74 for
general-purpose magnetic flux vector control.)
Before performing offline auto tuning
Check the following before performing offline auto tuning:
●
The inverter is under V/f control.
●
A motor should be connected. Note that the motor should be at a stop at a tuning start.
●
The motor capacity should be equal to or one rank lower than the inverter capacity.
(The capacity should be 0.1kW or more.)
●
A high-slip motor, high-speed motor and special motor cannot be tuned.
(The maximum frequency is 120Hz.)
●
The motor may run slightly. Therefore, fix the motor securely with a mechanical brake, or
before tuning, make sure that there will be no problem in safety if the motor runs (caution is
required especially in vertical lift applications). Note that tuning performance is unaffected
even if the motor runs slightly.
●
Offline auto tuning will not be performed properly if it is performed with a surge voltage
suppression filter (FFR-DT or FFR-SI) connected between the inverter and motor. Remove
it before starting tuning.
Setting
●
Set "21" in Pr. 96 "Auto tuning setting/status". Tuning is performed without motor running.
●
Set the rated motor current (initial value is rated inverter current) in Pr. 9 "Electronic thermal
O/L relay". (Refer to section 6.7).
●
Set Pr. 71according to the motor used.
Refer to section for other settings of Pr. 71.
Motor Pr. 71
Mitsubishi standard motor,
Mitsubishi high efficiency motor
SF-JR 3
SF-JR 4P-1.5kW or less 23
SF-HR 43
Others 3
Mitsubishi constant-torque motor
SF-JRCA 4P 13
SF-HRCA 53
Others (SF-JRC, etc.) 13
Other manufacturer's standard motor — 3
Other manufacturer's constant torque motor — 13
Tab. 6-24: Motor selection