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Appendix 3 Control and Monitoring Specific Inverter Data
Appendix 3-6
(2) iS7 Inverter Output Frequency Monitoring
Special D register of PLC
▶
option card for inverter output frequency monitoring
Special D
Register
Function
Detailed Description
D4471 Output
Freq.
Current output Freq. x 100
(Ex. If D4471 value is 3125,
current output freq. is 31.25 Hz.)
Exemplary program
▶
1) Set up iS7 inverter parameters as follows.
Code
Function Name
Set Value
DRV01
Cmd Frequency
29.00 Hz
DRV06 Cmd
Source
Keypad
DRV07 Freq
Ref
Src
Keypad-1
2) Run the KGLWIN and make out following program.
3) On the inverter’s digital loader, press “FWD” for forward operation to 29.00Hz.
4) Now, the D4471 will read “2900” as shown below.
5) Set up DRV01 (Cmd Frequency) to “30.00Hz.” The D4471 will be changed to “03000” and the M0024
relay will be ON.