Mitsubishi Electric FR-F820-00077 Instruction Manual page 474

(C) Motor constant parameters
NOTE 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. With its torque boost value automatically changed, the
output current could increase depending on the load conditions.
When the protective function, such as the electronic thermal O/L relay (E.THT, E.THM) or the stall
prevention (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. 14
Pr. 96
Pr. 100 to Pr. 109
Pr. 178 to Pr. 189
Pr. 684
5 - 302
Torque boost
DC injection brake operation voltage
Load pattern selection
Auto tuning setting/status
(Adjustable 5 points V/F)
(input terminal function selection)
Tuning data unit switchover
Parameters
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