Cn-14
DC injection braking
starting frequency
Cn-07
Min. output frequency
Cn-17
DC injection braking at start
Cn-16
DC injection braking at stop
Fig. 21 DC injection braking time chart
(12) Frequency Command Upper Bound (Cn-18)
(13) Frequency Command Lower Bound (Cn-19)
•The upper and lower bounds of the frequency command are set as a percentage of
the Max. output frequency (Cn-02 as 100%), in increments of 1%.
•The relationship Cn-18 > Cn-19 must be abided by. If not, an error message “Freq.
Limit Setting Error” may occur.
•When the frequency command is zero and a run command is input, the motor
operates at the frequency command lower bound (Cn-19). The motor will not
operate, however, if the lower limit is set lower than the Min. output frequency
(Cn-07).
Cn-19
100%
Cn-18
100%
frequency command
Output frequency
Fig. 22 Upper and lower bounds of the frequency command
(14)Frequency Jump Point 1 (Cn-20)
(15)Frequency Jump Point 2 (Cn-21)
(16)Frequency Jump Point 3 (Cn-22)
(17)Jump Frequency Width (Cn-23)
•These settings allow the “jumping” of certain frequencies within the inverter’s
output frequency range so that the motor can operate without resonant oscillations
caused by some machine systems.
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