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b. Calculate the desired counts for a basket speed of 24 RPMs:
C
d
= [RPM
d
* (C/RPM)] + D
C
d
= [24 RPMs * (6 counts per RPM)] + 15
159 = 144 + 15
c. Calculate the desired voltage:
V
d
= C
d
/ 409.5
0.3883 = 159 / 409.5
2. The DC voltage measured at the output terminals of the D-to-A board and at analog voltage
input terminals FV and FC on the inverter (shown in Figure 2) should match this number.
You may see a small voltage drop from the D-to-A board to the inverter.
Figure 2: Measuring Control Voltage at D-to-A Board and Inverter
Digital-to-Analog Board Legend
A. MTA-43 Pin 3
B. MTA-43 Pin 8
C. Inverter terminal A1
D. Inverter terminal AC
E. Inverter terminal FV
F. Inverter terminal FC
Inverter Analog Terminals for Yaskawa F7
Inverter Analog Terminals for Yaskawa GPD 506
.
3. If this value is wrong at the D-to-A board, replace the board.