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54
3.3.2 Main parameter settings
The main parameter settings are given below. For more information, refer to "CHAPTER 4 PARAMETERS".
(1) Setting of maximum frequency
(
Pr. 1 "maximum frequency"
)
Set this parameter to define the upper limit of the output frequency.
You can limit the maximum frequency within the range of the frequency set in Pr. 903 or Pr. 905 "frequency
setting voltage (current) gain", but change the setting only when necessary.
Factory setting: 120Hz
(2) Setting of minimum frequency
(
Pr. 2 "minimum frequency"
)
Set this parameter to define the lower limit of the output frequency.
When you have set the minimum frequency, simply switching the start signal on runs the motor at the preset
minimum frequency if the frequency setting is 0Hz. (At this time, the output starts from the starting frequency
value for acceleration.)
Factory setting: 0Hz
(
3
)
Setting of acceleration and deceleration times
(
Pr. 7 "acceleration time", Pr. 8
"deceleration time", Pr. 44 "second acceleration/deceleration time", Pr. 45
"second deceleration time"
)
Change this time to perform acceleration/deceleration operation at any other time than those factory-set.
Parameter Factory Setting
Pr. 7 "acceleration time"
7.5K or less ... 5 s,
11K or more ... 15 s or longer
Pr. 8 "deceleration time"
7.5K or less ... 10 s,
11K or more ... 30 s or longer
Pr. 44 "second acceleration/deceleration time" 5 s
Pr. 45 "second deceleration time" 9999 (as set in Pr. 44)
(4) Setting of electronic overcurrent protection (Pr. 9 "electronic thermal O/L relay")
The factory setting is the rated current value of the inverter.
When changing the setting, set the current given for 50Hz on the motor rating plate.
Note: The operation characteristic is based on that of the Mitsubishi standard squirrel-cage motor. Since
this parameter is not applicable to a special motor, use an external thermal relay etc. to protect such
a motor.
(You can select a constant-torque motor with Pr. 71 "applied motor".)
3
Simple mode parameter