MITSUBISHI ELECTRIC FR-S520E - Manual (Page 79)

69
Explanation of functions (parameters)
2
F
UNCT
IO
NS
2.3.3 Base frequency, base frequency voltage
(Pr.3 , Pr.19 , Pr.47 )
*1. 1.9 times greater than the power supply voltage for the FR-S510WE-0.1K to 0.75K.
*2. Twice greater than the power supply voltage for the FR-S510WE-0.1K to 0.75K.
<Setting>
•In Pr. 3 and Pr. 47, set the base frequency (motor's rated frequency).
Use the RT signal to switch between these two different base frequencies.
(Turn on the RT signal to make Pr. 47 valid.) (*)
When running the standard motor, generally set the "base frequency" to the rated
frequency of the motor. When running the motor using commercial power supply-
inverter switch-over operation, set the base frequency to the same value as the
power supply frequency.
If only "50Hz" is given on the motor rating plate as the frequency, always set the
"base frequency" to "50Hz". If it remains at "60Hz", the voltage may become too low
and torque shortage occurs, resulting in an overload trip. Special care must be taken
when "1" is set in Pr. 14 "load pattern selection".
•Set the base voltage (e.g. rated voltage of motor) in Pr. 19.
Used to adjust the inverter
outputs (voltage, frequency) to
the motor rating.
Parameter Name
Factory
Setting
Setting
Range
Remarks
3 Base frequency 60Hz 0 to 120Hz 
19
Base frequency
voltage
- - -
0 to 800V,
888, - - -
888: 95% of power supply voltage (*1)
- - -: Same as power supply voltage (*2)
Setting is enabled when Pr. 30 = "1".
47
Second V/F
(base frequency)
- - -
0 to 120Hz,
- - -
- - -: Function invalid
Setting is enabled when Pr. 30 = "1".
CAUTION
1. Set 60Hz in Pr. 3 "base frequency" when using a Mitsubishi constant-torque
motor.
2. When automatic torque boost is selected, Pr. 47 is invalid. When automatic
torque boost is selected, setting "- - -" or "888" in Pr. 19 uses the rated
output voltage.
REMARKS
* The RT signal serves as the second function selection signal and makes the other second
functions valid.
♦Related parameters♦
• When rated motor frequency is "50Hz" ⇒ Pr. 14 "load pattern selection" (refer to page 77)
•
RT signal (second function "Pr. 47") setting ⇒ Pr. 60 to Pr. 63 (input terminal function selection)
(refer to page 102)
•
Motor setting ⇒ Pr. 71 "applied motor" (refer to page 73)
•
Automatic torque boost selection ⇒ Pr. 98 "automatic torque boost selection (motor capacity)"
(refer to page 125)
Pr.19
Out
put
v
o
lt
age
Output
frequency (Hz)
Pr.3
Pr.47