Omron MX2 Series - Analog Input Filter; Analog Command Hold Function (AHD)

7 Other Functions
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Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
7-3-2 Analog Input Filter
This function is effective for removing noise in the analog input circuit.
Use it to set an input filter for voltage or current input when using an external analog signal to input the
frequency reference.
However, increasing the set value results in a slow response. The filter time constant is 2 ms for a set
value of 1 to 30.
When set to 31., the parameter applies a filter time constant of 500 ms and a hysteresis of ±0.1 Hz.
Set a larger data value if stable operation cannot be secured because of noise etc.
Parameter
No.
Function name
Data
Default
data
Unit
A016
Analog Input Filter
1. to 30.: Set value  2-ms filter
31.: Fixed to 50-ms filter
with ±0.1-Hz hysteresis
*1
8.
−
*1. When using the PID function, do not set the Analog Input Filter (A016) to 31 (500-ms filter with ±0.1-Hz hys-
teresis). Doing so may result in unstable operation.
7-3-3 Analog Command Hold Function (AHD)
Use this function to hold the frequency reference value via analog input.
Set the Multi-function Input 1 to 7 Selection (C001 to C007) to 65 (AHD: Analog command held). This
function causes the inverter to hold the result of analog input to the terminal AHD while it is ON.
While the terminal AHD is ON, you can use the UP/DWN function with the frequency reference held by
this function as a reference value. Setting the UP/DWN Storage Selection (C101) to 01 enables the
inverter to store the UP/DWN result.
For details on the UP/DWN function, refer to 7-5-9 Remote Operation Function (UP/DWN) on page
7-40.
If the power supply is turned on, or if the terminal Reset (18: RS) turns from ON to OFF, with the termi-
nal AHD ON, the last held data is available.
Parameter
No.
Function name
Data
Default
data
Unit
C001 to
C007
Multi-function Input 1
to 7 Selection
65: AHD (Analog command held)
−
−
Related functions
C101
AHD input
Analog input
value
Frequency
reference
• If you switch from the 1st control to the 2nd control with the terminal AHD ON, the held analog input
value will remain as the frequency reference. To switch the control function, turn OFF the terminal
AHD and have the inverter hold the signal again.
• Frequent use of this function could shorten the life expectancy of the internal EEPROM device.
ON