5-24
• When you change the upper frequency limit (F15) in order to increase
the running frequency, be sure to change the maximum frequency (F03)
accordingly.
• Maintain the following relationship among the parameters for frequenc
control:
F03
F15 > F16 F23 F25, or F03 F15 > F16 F25 F23,
where, F23 is the starting frequency and F25 is the stopping frequency.
If the above relationship is not observed, then the motor may not
operate (accelerate, decelerate, or stop) at the specified frequency.
• If you specify the lower frequency limit (F16) above the upper frequenc
limit (F15), the upper frequency limit (F15) will be automatically selected
and the lower limit (F16) will be ignored.
F18
C50
C32, C34
C37, C39
Bias (Frequency command 1)
Bias (Frequency command 1) (Bias base point )
Analog Input Adjustment for [12] (Gain and Gain base point)
Analog Input Adjustment for [C1] (Gain and Gain base point)
If you select any analog input for frequency set 1 (set by F01), you can define the
relationship between the analog input and the reference frequency arbitrarily by
combining the settings for bias (F18), bias base point (C50), gains (C32 and C37),
and gain base points (C34 and C39).
As illustrated in the graph below, the relationship between the reference frequency
and analog input level for frequency 1 is shown by a straight line passing through
points "A" and "B". The point "A" is determined by the bias command (F18) and its
reference point (C50). The point "B" is determined by the gain command (C32 or
C37) and its base point (C34 or C39). The combination of C32 and C34 will apply for
terminal [12] and that of C37 and C39 for terminal [C1].
The bias (F18) and gain (C32 or C37) should be set, assuming the maximum fre-
quency as 100%. The bias base point (C50) and gain base point (C34 or C39)
should be set, assuming the full scale (+10 VDC or +20 mA) as 100%.
• Analog input under the bias base point is limited by the bias data.
• If "bias base point (C50)
gain base point (C34/C39)," the inverte
interprets the setting as invalid and sets the output frequency at 0 Hz.
To Next Page
Loading...
