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Base Frequency, Base Frequency Voltage (pr. 3, Pr. 19, Pr. 47, Pr. 113) - Mitsubishi Electric FR-A500 Instruction Manual

Transistorized inverter.
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4.2.3

Base frequency, base frequency voltage (Pr. 3, Pr. 19, Pr. 47, Pr. 113)

Pr. 3 "base frequency"
Pr. 19 "base frequency voltage"
Pr. 47 "second V/F (base frequency)
Pr. 113 "third V/F (base frequency)
Used to adjust the inverter outputs (voltage, frequency) to the motor rating.
When running a standard motor, generally set the rated motor frequency. When running the motor using
the commercial power supply-inverter switchover, set the base frequency to the same value as the power
supply frequency.
Always set this frequency to "50Hz" if the frequency indicated in the motor rating plate is "50Hz" only.
Leaving the base frequency unchanged from "60Hz" may make the voltage too low and the torque
insufficient, resulting in an overload trip. Special, care must be taken when "1" is set in Pr. 14 "load pattern
selection".
Parameter
Factory Setting
Number
3
60Hz <50Hz>
19
9999 <8888>
47
9999
113
9999
<Setting>
• Use Pr. 3, Pr. 47 and Pr. 113 to set the base frequency (rated motor frequency). Three different base
frequencies can be set and the required frequency can be selected from among them.
• Pr. 47 "second V/F (base frequency)" is made valid when the RT signal turns on, and Pr. 113 "third V/F
(base frequency)" is made valid when the X9 signal turns on. Use any of Pr. 180 to Pr. 186 to assign the
terminal used for X9 signal input. (Note 4)
• Use Pr. 19 to set the base voltage (e.g. rated motor voltage).
Note: 1. When using the Mitsubishi constant-torque motor, set Pr. 3 "base frequency" to 60Hz.
2. When the advanced magnetic flux vector control mode has been selected using Pr. 80 and
Pr. 81, Pr. 3, Pr. 47, Pr. 113 and Pr. 19 are made invalid and Pr. 84 and Pr. 83 are made valid.
However, Pr. 3, Pr. 47 or Pr. 113 is made valid for the S-shaped inflection pattern point of Pr. 29.
3. When "2" (5-point flexible V/F characteristics) is set in Pr. 71, the Pr. 47 and Pr. 113 settings are
made invalid.
Also, "8888" and "9999" can not be set in Pr. 19.
4. The RT (X9) signal acts as the second function selection signal and makes the other second
functions valid. Refer to page 155 for Pr. 180 to Pr. 186 (input terminal function selection).
Setting Range
0 to 400Hz
0 to 1000V,
8888: 95% of power supply voltage
8888, 9999
9999: Same as power supply voltage
0 to 400Hz, 9999
9999: Function invalid
0 to 400Hz, 9999
9999: Function invalid
Pr.19
73
PARAMETERS
Related parameters
Pr. 14 "load pattern selection"
Pr. 71 "applied motor"
Pr. 80 "motor capacity"
Pr. 81 "number of motor poles"
Pr. 83 "rated motor voltage"
Pr. 84 "rated motor frequency"
Pr. 180 to Pr. 186 (input terminal
function selection)
Remarks
Output frequency (Hz)
Pr.3
Pr.47
Pr.113
4

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