Siemens LME71 Series

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Smart Infrastructure Basic Documentation LME7... CC1P7105en
11 Multistage or modulating mode with actuator 24.07.2020
11.5 Multistage / modulating mode via 3-
position step input terminal X5-03
The signal time of a control pulse is a minimum of 147 ms.
11.5.1 Maximum possible resolution
The maximum possible resolution via 3-position step input terminal X5-03 is calculated
according to the following formula:
Working range in angular degrees x 0.147 s
---------------------------------------------------- = maximum possible resolution in angular degree
Running time in seconds
Example: Actuator, 30 seconds running time for 90°
90° x 0.147 s
------------------- = 0.441° ≈ 0.5°
30 s
11.6 Modulating mode via analog input signal
terminal X65 (LME71/LME73 only)
11.6.1 Maximum possible resolution
For maximum possible resolution see chapter Setting the minimum power control step
(dead band) (parameter 123) in modulating mode via analog input signal terminal X65.
11.6.2 Standardization of modulation range
In the modulation range, the analog input signal is standardized. This means that the
low-fire position corresponds to a preset output of 0% = 0 V- / 0 mA- / 4 mA- / 0  input
signal and the high-fire position corresponds to a preset output of 100% = 10 V- /
20 mA- / 135  input signal.
The modulation range in angular degrees corresponds to the angular rotation from the
low-fire to the high-fire position.
Calculation: High-fire position minus low-fire position = modulation range.