Mitsubishi Electric FR-E800, Instruction Manual

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16. (G) Control Parameters
16.2 Base frequency voltage
16.2
Base frequency voltage
Use this function to adjust the inverter outputs (voltage, frequency) to match with the motor rating.
*1 Gr.1 and Gr.2 are the parameter initial value groups. (Refer to page 52 ).
 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 page 334 .)
 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.
• To operate a Vector control dedicated motor (SF-V5RU) with V/F control, the setting is as shown in the following table.
Pr. Name
Initial value
*1
Setting range Description
Gr.1 Gr.2
3
G001
Base frequency 60 Hz 50 Hz 0 to 590 Hz Set the frequency at the rated motor torque. (50/60 Hz)
19
G002
Base frequency voltage 9999 8888
0 to 1000 V Set the base voltage.
8888 95% of the power supply voltage
9999 Same as the power supply voltage
47
G011
Second V/F (base frequency) 9999
0 to 590 Hz Set the base frequency when the RT signal is ON.
9999 Second V/F disabled
V/F V/F V/F
Pr.19
Output frequency
(Hz)
Pr.3
Pr.47
Output voltage (V)
(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.