Mitsubishi Electric FR-A720-0.4K Instruction Manual page 171

V/F pattern
(3) Base frequency voltage setting (Pr. 19)
⋅ Use Pr. 19 Base frequency voltage to set the base voltage (e.g. rated motor voltage).
⋅ If the setting is less than the power supply voltage, the maximum output voltage of the inverter is as set in Pr. 19.
⋅ Pr. 19 can be utilized in the following cases.
(a) When regeneration frequency is high (e.g. continuous regeneration)
During regeneration, the output voltage becomes higher than the reference and may cause an overcurrent trip
(E.OC ) due to an increased motor current.
(b) When power supply voltage variation is large
When the power supply voltage exceeds the rated voltage of the motor, speed variation or motor overheat may
be caused by excessive torque or increased motor current.
⋅ Set parameters as below when running the vector control dedicated motor (SF-V5RU, SF-V5RU1, SF-V5RU3, SF-
V5RU4, SF-VR) under V/F control.
Motor Type
SF-V5RU-3.7kW or lower
SF-V5RU-5.5kW or higher
SF-V5RUH-3.7kW or lower
SF-V5RUH-5.5kW or higher
SF-V5RU1-30kW or lower
SF-V5RU1-37kW
SF-V5RU3-22kW or lower
SF-V5RU3-30kW
SF-V5RU4-3.7kW, 7.5kW
SF-V5RU4-other than the above
SF-VR
SF-VRH
REMARKS
When operation is discontinued under vector control due to failure of an encoder, etc., setting "9999" in Pr. 80 Motor capacity or Pr. 81
Number of motor poles enables V/F control operation.
CAUTION
⋅ When Advanced magnetic flux vector control mode, Real sensorless vector control or vector control is selected, Pr. 3, Pr. 47, Pr.
113 and Pr. 19 are invalid and Pr. 83 and Pr. 84 are valid.
Note that Pr. 3 or Pr. 47 and Pr. 113 values are valid as inflection points of S-pattern when Pr. 29 Acceleration/deceleration pattern
selection = "1" (S-pattern acceleration/deceleration A).
⋅ When Pr. 71 Applied motor is set to "2" (adjustable 5 points V/F characteristic), the Pr. 47 and Pr. 113 setting becomes invalid. In
addition, you cannot set "8888" or "9999" in Pr. 19.
⋅ Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Set
parameters after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 14 Load pattern selection
Pr. 29 Acceleration/deceleration pattern selection
Pr. 71 Applied motor Refer to page 187
Pr. 80 Motor capacity Refer to page 92
Pr. 83 Rated motor voltage, Pr. 84 Rated motor frequency
Pr. 178 to Pr. 189 (input terminal function selection)
Advanced magnetic flux vector control
Real sensorless vector control
160
Pr. 19 Setting
170V
160V
340V
320V
160V
170V
160V
170V
150V
160V
160V
320V
Refer to page 161
Refer to page 176
Refer to page 189
Refer to page 231
Refer to page 148
Refer to page 92
Pr. 3 Setting
50Hz
33.33Hz
16.67Hz
50Hz