Adjust the gain of the auxiliary reference source selected in BAS-03 (Aux Ref Src).
Set one of the multi-function (digital) input terminals to 31 (dis Aux Ref) and activate it to
disable the auxiliary frequency reference. The inverter will operate using the main
frequency reference only.
The tables below provide examples of using the available calculated conditions for the main and
auxiliary frequency references. Refer to the table to see how the calculations apply with each
example. When the maximum frequency value is high, output frequency deviation may result due
to analog input variation and deviations in the calculations.
Auxiliary Reference Operation Example #1
• Keypad Frequency Setting is Main Frequency and V1 Analog Voltage is Auxiliary
Frequency
• Main frequency: Keypad (operation frequency 30Hz)
• Maximum frequency setting (DRV-20): 400Hz
• Auxiliary frequency setting (BAS-03): V1[Display by percentage (%) or auxiliary frequency
(Hz) depending on the operation setting condition]
• Auxiliary reference gain setting (BAS-05): 50%
• Analog Input scaling parameters IN-01–58 are at factory default settings
Example: an input voltage of 6V is supplied to V1, and the frequency corresponding to 10V is
60Hz. The table below shows the auxiliary frequency A as 36Hz[=60Hz X (6V/10V)] or 60%[=
100% X (6V/10V)].
Calculating final command frequency**
30Hz(M)+(50%(G)x36Hz(A))=48Hz
30Hz(M)x(50%(G)x60%(A))=9Hz
30Hz(M)/(50%(G)x60%(A))=100Hz
M[Hz]+{M[Hz]*(G[%]*A[%])}
30Hz(M)+{30[Hz]x(50%(G)x60%(A))}=39Hz
M[Hz]+G[%]*2*(A[%]-50[%])[Hz]
30Hz(M)+50%(G)x2x(60%(A)–50%)x60Hz=36Hz
M[HZ]*{G[%]*2*(A[%]-50[%])}
30Hz(M)x{50%(G)x2x(60%(A)–50%)}=3Hz
M[HZ]/{G[%]*2*(A[%]-50[%])}
30Hz(M)/{50%(G)x2x(60%–50%)}=300Hz
M[HZ]+M[HZ]*G[%]*2*(A[%]-50[%])
30Hz(M)+30Hz(M)x50%(G)x2x(60%(A)–50%)=33Hz
• *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.
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