Learning Advanced Features
200
Auxiliary Reference Operation Ex #3
V1 is the Main Frequency, and I1 is the Auxiliary Frequency
•
Main frequency (DRV-07): V1 (frequency command setting to 5 V and is set to 30 Hz)
•
Maximum frequency setting (DRV-20): 400 Hz
•
Auxiliary frequency (BAS-01): I1 [Display by percentage (%) or auxiliary frequency (Hz)
depending on the operation setting condition]
•
Auxiliary reference gain (BAS-03): 50%
•
IN-01
–
32: Factory default
Example: An input current of 10.4 mA is applied to I1, with the frequency corresponding to 20 mA
of 60 Hz. The table below shows auxiliary frequency A as 24 Hz [=60[Hz]x{(10.4[mA]-
4[mA])/(20[mA]-4[mA])}] or 40% [=100[%] x {(10.4[mA] - 4[mA]) /(20 [mA] - 4[mA])}].
Setting*
Calculating final command frequency**
0 M[Hz]+(G[%]*A[Hz])
30 Hz(M)+(50%(G)x24 Hz(A))=42 Hz
1 M[Hz]*(G[%]*A[%])
30 Hz(M)x(50%(G)x40%(A))=6 Hz
2 M[Hz]/(G[%]*A[%])
30 Hz(M)/(50%(G)x40%(A))=150 Hz
3 M[Hz]+{M[Hz]*(G[%]*A[%])}
30 Hz(M)+{30[Hz]x(50%(G)x40%(A))}=36 Hz
4 M[Hz]+G[%]*2*(A[%]-50[%])[Hz]
30 Hz(M)+50%(G)x2x(40%(A)
–
50%)x60 Hz=24 Hz
5 M[HZ]*{G[%]*2*(A[%]-50[%])}
30 Hz(M)x{50%(G)x2x(40%(A)
–
50%)}=-3 Hz (Reverse)
6 M[HZ]/{G[%]*2*(A[%]-50[%])}
30 Hz(M)/{50%(G)x2x(60%
–
40%)}=-300 Hz(Reverse)
7 M[HZ]+M[HZ]*G[%]*2*(A[%]-50[%]) 30 Hz(M)+30 Hz(M)x50%(G)x2x(40%(A)
–
50%)=27 Hz
*
M: Main frequency reference (Hz or rpm)/G: Auxiliary reference gain (%)/A: Auxiliary frequency
reference (Hz or rpm) or gain (%).
**If the frequency setting is changed to rpm, it is converted to rpm instead of Hz.
Note
When the maximum frequency value is high, output frequency deviation may occur due to analog
input variation and deviations in the calculations.
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