334
Inverter Positioning Section 5-3
Referencing the
Automatically Calculated
Inverter Frequency
Command Value
If the following settings are made in the PLC Setup, the inverter frequency
command value will be calculated automatically and set in A23 in the Auxiliary
Area. These settings are on the Inverter Positioning 0 Tab Page in the PLC
Setup.
• Power Supply Frequency for One Motor Revolution per Second (0.1-Hz
increments)
• Number of Encoder Pulses for One Motor Revolution
• Error Counter Cycle (x 4 ms)
The inverter frequency command value in A23 is accessed and converted to
an analog output signal. The CP1W/CPM1A-DA041 has a resolution of 6,000,
so the conversion to an analog signal is performed as follows:
6,000 ÷ 60 Hz (inverter’s maximum output frequency) ÷ 100 = 1
The conditions are as follows:
In this example, the results of *U and /UL are 1, so the value in A23 is moved
directly to D102 with MOV.
Error counter
Operation
Inverter
Inductive motor
Encoder
Outputs not
accepted
Forward/Reverse Command
Bit turned ON.
The contents of D102 is set in D1020.
Analog
conversion
trigger
Operation
Command Bit
Operation
Command Bit
A26.00
In-position Flag
Forward
Command Bit
A26.01
Forward
Command Bit
Reverse
Command Bit
T0
T0
T0
A26.00
A26.01 A26.02
A26.03
100.02
100.03
The frequency command value is divided by
100 to convert to Hz and stored in D1020.
To convert to the analog output value, the inverter
frequency command value is multiplied by 100
(analog resolution of 6,000 divided by inverter's
maximum frequency of 60) and stored in D1010
and D1011.
An analog value of 0 for the
stop command set in D102.
*U
A023
&100
D1010
/U
D1010
&100
D1020
MOV
#0000
D102
MOV
D1020
D102
Always ON Flag
P_On
TIM
0
#0003
Time for data for Analog Output Unit to become valid.
Analog
conversion
trigger
Analog
conversion
trigger
Reverse
Command Bit
A26.02
To Next Page
Loading...
