Base Frequency Voltage - Mitsubishi Electric FR-A800 Series Instruction Manual

Parameters referred to
Pr.3 Base frequency, Pr.19 Base frequency
Pr.71 Applied motorpage 528
Pr.178 to Pr.189 (Input terminal function

5.16.2 Base frequency voltage

V/F V/F V/F
Use this function to adjust the inverter outputs (voltage, frequency) to match with the motor rating.
Pr.
3
Base frequency
G001
19
Base frequency voltage
G002
47 Second V/F (base
G011 frequency)
113 Third V/F (base
G021 frequency)
 Base frequency setting (Pr.3)
• When operating a standard motor, generally set the rated frequency of the motor in Pr.3 Base frequency. When the motor
operation require switching to the commercial power supply, set the power supply frequency in Pr.3.
• When the frequency described on the motor rating plate is "50 Hz" only, make sure to set to 50 Hz. When it is set to 60 Hz,
the voltage will drop too much, causing insufficient torque. As a result, the inverter output may be shut off due to overload.
A caution is required especially in case of Pr.14 Load pattern selection = "1" (variable torque load).
• When using the Mitsubishi Electric constant torque motor, set Pr.3 to 60 Hz.
 Setting multiple base frequencies (Pr.47, Pr.113)
• To change the base frequency when using a single inverter switching between multiple motors, use Pr.47 Second V/F
(base frequency) and Pr.113 Third V/F (base frequency).
• Pr.47 is enabled when the RT signal is ON and Pr.113 is enabled when the X9 signal is ON. To input the X9 signal, set
"9" in any of Pr.178 to Pr.189 (Input terminal function selection) to assign the function to a terminal.
NOTE
• The RT (X9) signal acts as the second (third) function selection signal and makes the other second (third) functions valid.
(Refer to
• The RT signal is assigned to the terminal RT in the initial status. Set "3" in one of Pr.178 to Pr.189 (Input terminal function
selection) to assign the RT signal to another terminal.
 Setting of base frequency voltage (Pr.19)
• Use Pr.19 Base frequency voltage to set the base voltage (for example, rated motor voltage).
• When it is set lower than the power supply voltage, maximum output voltage of the inverter will be the voltage set in Pr.19.
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voltagepage 707
selection)page 521
Initial value
Name
FM
60 Hz
9999
9999
9999
Pr.19
page 525.)
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Setting range
CA
Set the frequency at the rated motor torque. (50/60
50 Hz 0 to 590 Hz
Hz)
0 to 1000 V Set the base voltage.
8888 8888 95% of the power supply voltage
9999 Same as the power supply voltage
0 to 590 Hz Set the base frequency when the RL signal is ON.
9999 Second V/F disabled
0 to 590 Hz Set the base frequency when the X9 signal is ON.
9999 Third V/F disabled
Output frequency
(Hz)
Pr.3
Pr.47
Pr.113
Description
5. PARAMETERS
5.16 (G) Control parameters
1
2
3
4
5
6
7
8
9
10
707