User Manual of EM760 High-Performance Inverter EM760 series inverters have a fixed-length counting function, as shown in the figure below. The length counting function is performed by entering the length information from the digital input terminal in the pulse form and then setting the related function code. The final length count information can be outputted by the digital output terminal for other purposes (e.g. DI/VX input as the stop command). Users can also view the real-time length count via F18.34. The length resolution can be set by F16.13. In case of any change in the length resolution, F16.01 will change accordingly.
For example, ifF16.13 is set to 0:1m, the setting range ofF16.01 is 1-65535m. Fig. 6-34 Block Diagram of Fixed-length Counting Principle of fixed-length counting: The length detection sensor converts the length information into pulse information. The DI terminal collects the number N ofinput pulses. The length is calculated based on the set function code “Pulses per meter” α : l 1 = , and then compared with the “Set length” l . If l 1 l , it means that the length does not reach the set value; otherwise, the fixed-length count is completed. The “39: Clear length” input can be applied to clear the count and reset the output signal.
When the pulse frequency is greater than 250Hz (=1/(2 (default filtering times)*2*1ms -1 )), make sure of the input from the high-speed pulse input terminal (X5) and set F02.06 to “38: high-speed length count input”. 250Hz is only a theoretical value. The actual effect will prevail. In order to avoid errors, use the high-speed pulse input terminal wherever possible. Fig. 6-35 Example of Fixed-length Counting The figure above shows an example, where F16.01=2 and F16.02=4.0. When the length count is 8 (=2Ч4), the “16: length reached” output will be valid. When the “39: clear length” input is valid, the count will be cleared, and the “16: length reached” output will be invalid. 156