Mitsubishi Electric 800 Series Instruction Manual page 593

(G) Control parameters
Setting of base frequency voltage (Pr.19)
• For Pr.19 Base frequency voltage, set the base voltage (rated motor voltage, etc.).
• When it is set lower than the power supply voltage, maximum output voltage of the inverter will be the voltage set in Pr.19.
• Pr.19 can be used in following cases.
(a) Regenerative driving (continuous regeneration, etc.) is performed often
Output voltage will get higher than the specification during the regenerative driving, which may cause overcurrent trip (E.OC[]) by
the increase in motor current.
(b) When the fluctuation of power supply voltage is high
When the power supply voltage exceeds the rated voltage of the motor, fluctuation of rotation speed or overheating of motor may
occur due to excessive torque or increase in motor current.
NOTE
• When the operation becomes not possible due to failure in encoder, etc., at the time of vector control, set Pr.80 Motor
capacity or Pr.81 Number of motor poles = "9999" to perform V/F control.
• When the Advanced magnetic flux vector control, Real sensorless vector control, vector control, or PM sensorless vector
control is selected, Pr.3, Pr.47, Pr.113, and Pr.19 will become disabled, and Pr.83 and Pr.84 will become enabled.
However, S-pattern curve with Pr.29 Acceleration/deceleration pattern selection = "1" (S-pattern acceleration/deceleration
A) will make Pr.3 or Pr.47 and Pr.113 enabled. (S-pattern curve at the time of the PM sensorless vector control is the rated
frequency of the motor.)
• When Pr.71 Applied motor = "2" (adjustable 5 points V/F), setting for Pr.47 and Pr.113 will become disabled. Also, Pr.19
cannot be set to "8888" or "9999".
• 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 page 423
Pr.83 Rated motor voltage, Pr.84 Rated motor frequency
Pr.178 to Pr.189 (Input terminal function selection)
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PARAMETERS
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