Mitsubishi Electric FR-A820-00046 Instruction Manual page 658

(C) Motor constant parameters
NOTES When the Pr. 0 and Pr. 12 settings are changed from their initial values, automatic change is not
performed.
When the SF-PR motor is selected (Pr. 71="70, 73, or 74"), the output current may become large
due to a small load by setting Pr.81 Number of motor poles according to the number of the SF-PR
motor poles.
When the SF-PR motor is used, the output current tends to increase compared with the case
where the SF-JR or SF-HR motor is used. Depending on the load conditions, the output current
may increase even though the torque boost value has been automatically changed. When the
protective function, such as the electronic thermal O/L relay (E.THT, E.THM) and the stall preven-
tion (OL, E.OLT), etc. is activated, adjust the Pr. 0 "Torque boost" setting according to the load.
CAUTION:
E
Make sure to set this parameter correctly according to the motor used. Incorrect setting may
cause the motor and inverter to overheat and burn.
Parameters referred to
Pr. 0
Pr. 12
Pr. 96
Pr. 100 to Pr. 109
Pr. 178 to Pr. 189
Pr. 684
Pr. 800
5 - 456
Torque boost
DC injection brake operation voltage
Auto tuning setting/status
(Adjustable 5 points V/F)
(input terminal function selection)
Tuning data unit switchover
Control method selection
Parameters
=> page 5-688
=> page 5-701
=> page 5-72
=> page 5-698
=> page 5-439
=> page 5-72
=> page 5-61