Base Frequency, Voltage - Mitsubishi Electric 800 Series Instruction Manual

5.16.2

Base frequency, voltage

Use this function to adjust the inverter outputs (voltage, frequency) to match with the motor rating.
Pr. Name
3
Base frequency
G001
19
Base frequency voltage
G002
47 Second V/F (base
G011 frequency)
113 Third V/F (base
G021 frequency)
Setting of base frequency (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 may trip due to overload.
A caution is required especially in case of Pr.14 Load pattern selection = "1" (variable torque load).
Setting multiple base frequencies (Pr.47, Pr.113)
• To change the base frequency when using single inverter switching between multiple motors, use Pr.47 Second V/F (base
frequency) and Pr.113 Third V/F (base frequency).
• Pr.47 will become enabled when the RT signal turns ON and Pr.113 when the X9 signal turns 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 page 419.)
• The RT signal is assigned to the terminal RT in the initial status. It is also possible to assign the RT signal to other terminal by
setting "3" on Pr.178 to Pr.189 (Input terminal function selection).
Setting
Initial value
range
60 Hz 0 to 590 Hz
0 to 1000 V
9999 8888
9999
0 to 590 Hz
9999
9999
0 to 590 Hz
9999
9999
Pr.19
(G) Control parameters
V/F V/F V/F
Description
Set the frequency at the rated motor torque. (50 Hz/60 Hz)
Set the base voltage.
95% of the power supply voltage
Same as the power supply voltage
Set the base frequency at the RT signal ON.
Second V/F disabled
Set the base frequency at the X9 signal ON.
Third V/F disabled
Output frequency
(Hz)
Pr.3
Pr.47
Pr.113
PARAMETERS
5
GROUP
G
591