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Base Frequency Voltage - Mitsubishi Electric FR-CS84-012 Instruction Manual

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NOTE
• Set a larger value when the distance between the inverter and the motor is long or when there is not enough motor torque in
the low-speed range. It may cause overcurrent trip when it is set too large.
• Setting for Pr.0 is enabled only when the V/F control is selected.
• When the SF-PR motor is used, the output current tends to increase compared with the case where the SF-JR or SF-HR motor
is used. When the protective function such as the electronic thermal O/L relay (E.THT, E.THM) or stall prevention (OLC,
E.OLT) is activated, adjust the Pr.0 according to the load.
Parameters referred to
Pr.3 Base frequency, Pr.19 Base frequency voltage
page 147
Pr.71 Applied motor

5.12.2 Base frequency voltage

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 8888
G002
 Setting of base frequency (Pr.3)
• When operating a standard motor, generally set the rated frequency of the motor in
operation require switching to the commercial power supply, set the power supply frequency in
• 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.
• When using the Mitsubishi Electric constant torque motor, set
NOTE
• Set "3" in any of Pr.178 to Pr.182 (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
• When a value equal to or lower than the power supply voltage is set, maximum output voltage of the inverter is the voltage
set in
.
Pr.19
can be used in the following cases:
Pr.19
(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.
194
5. PARAMETERS
5.12 (G) Control parameters
page 194
Name
Initial value
50 Hz
Pr.19
to set the base voltage (for example, rated motor voltage).
Setting range
Set the frequency at the rated motor torque. (50/
10 to 400 Hz
60 Hz)
0 to 1000 V
Set the base voltage.
8888
95% of the power supply voltage.
9999
Same as the power supply voltage.
to 60 Hz.
Pr.3
Output frequency (Hz)
Pr.3
Description
. When the motor
Pr.3 Base frequency
.
Pr.3

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