BENSHAW RSi GM2 Series - Page 106

Learning Advanced Features
96
890054-00-00
GM2 Series VFD
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 E.g. #1
Keypad Frequency Setting is Main Frequency and V1 Analog Voltage is Auxiliary
Frequency
• Main frequency: Keypad (operating frequency 30 Hz)
• Maximum frequency setting (dr.20): 400 Hz
• Auxiliary frequency setting (bA.01): V1[Display by percentage(%) or auxiliary frequency (Hz)
depending on the operation setting condition]
• Auxiliary reference gain setting (bA.03): 50%
• In.01-32: Factory default output
Example: an input voltage of 6V is supplied to V1, and the frequency corresponding to 10 V is 60
Hz. The table below shows the auxiliary frequency A as 36 Hz[=60 Hz X (6 V/10 V)] or 60%[= 100%
X (6 V/10 V)].
Setting*
Calculating final reference frequency
0
M[Hz]+(G[%]*A[Hz])
30 Hz(M)+(50%(G)x36 Hz(A))=48 Hz
1
M[Hz]*(G[%]*A[%])
30 Hz(M)x(50%(G)x60%(A))=9 Hz
2
M[Hz]/(G[%]*A[%])
30 Hz(M)/(50%(G)x60%(A))=100 Hz
3
M[Hz]+{M[Hz]*(G[%]*A[%])}
30 Hz(M)+{30[Hz]x(50%(G)x60%(A))}=39 Hz
4
M[Hz]+G[%]*2*(A[%]-50[%])[Hz]
30 Hz(M)+50%(G)x2x(60%(A)–50%)x60 Hz=36 Hz
5
M[Hz]*{G[%]*2*(A[%]-50[%])}
30 Hz(M)x{50%(G)x2x(60%(A)–50%)}=3 Hz
6
M[Hz]/{G[%]*2*(A[%]-50[%])}
30 Hz(M)/{50%(G)x2x(60%–50%)}=300 Hz
7
M[Hz]+M[hZ]*G[%]*2*(A[%]-50[%])
30 Hz(M)+30 Hz(M)x50%(G)x2x(60%(A)–50%)=33 Hz
*M: Main frequency reference/ G: Auxiliary reference gain (%)/ A: Auxiliary frequency
reference (Hz or rpm) or gain (%).
Auxiliary Reference Operation E.g. #2
Keypad Frequency Setting is Main Frequency and I2 Analog Voltage is Auxiliary
Frequency
• Main frequency: Keypad (operating frequency 30 Hz)
• Maximum frequency setting (dr.20): 400 Hz
• Auxiliary frequency setting (bA.01): I2[Display by percentage(%) or auxiliary frequency (Hz)
depending on the operation setting condition]
• Auxiliary reference gain setting (bA.03): 50%
• In.01-32: Factory default output
Example: an input current of 10.4 mA is applied to I2, 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])}.