Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 314 / 608

Operation selection at power failure Parameter
6 - 160
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 fol-
lowing order to set Pr. 298 "Frequency search gain" automatically. (Refer to page 6-90 during ad-
vanced magnetic flux vector control and 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.
●
A high-slip motor, high-speed motor and special motor cannot be tuned.
(The maximum frequency is 120 Hz.)
●
Even if tuning is performed without motor running (Pr. 96 "Auto tuning setting/status" = "21"), 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) 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.
According to the motor type and the inverter capacity, it takes approximately 9 s until tuning is
completed. (Excitation noise is produced during tuning.)
●
Set the rated motor current (initial value is rated inverter current) in Pr. 9 "Electronic thermal O/L
relay". (Refer to section 6.8).
●
Set Pr. 71 "Applied motor" according to the motor used.
햲
Refer to section 6.8.2, for other settings of Pr. 71.
Motor Pr. 71
햲
Mitsubishi standard motor,
Mitsubishi high efficiency motor
SF-JR 3
SF-JR 4P-1.5 kW 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. 6-41: Motor selection