Base Frequency Voltage - Mitsubishi Electric 800 Series Instruction Manual

15.2

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. Name
3
Base frequency
G001
19
Base frequency voltage
G002
47
Second V/F (base frequency)
G011
*1 Gr.1 and Gr.2 are the parameter initial value groups. (Refer to
 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)
• To change the base frequency when using a single inverter switching between multiple motors, use Pr.47 Second V/F
(base frequency).
• Pr.47 is enabled when the RT signal is ON. To input the RT signal, set "3" in any parameter from Pr.178 to Pr.189 (Input
terminal function selection) to assign the function.
NOTE
• The RT signal is the Second function selection signal which also enables other second functions. (Refer to
 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.
• Pr.19 can be used in the following cases.
(a) When regenerative driving (continuous regeneration, etc.) is performed frequently
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.
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15. (G) Control Parameters
15.2 Base frequency voltage
*1
Initial value
Setting range
Gr.1 Gr.2
60 Hz 50 Hz 0 to 590 Hz
0 to 1000 V
9999 8888 8888
9999
0 to 590 Hz
9999
9999
page
Pr.19
Set the frequency at the rated motor torque. (50/60 Hz)
Set the base voltage.
95% of the power supply voltage
Same as the power supply voltage
Set the base frequency when the RT signal is ON.
Second V/F disabled
82).
Output frequency
(Hz)
Pr.3
Pr.47
Description
page 289.)