
Configuration
8200SHB01997-60
7.5.14.9 Digital frequency input
Only “HVAC” controllers
Code Name Possible settings IMPORTANT
Lenze Choice Info
C425¤* Adjustment of
digital frequency
-2- Dig.-freq. Resolution Scanning Max.-freq.
-0- 100 Hz 1/200 1 s 300 Hz
-1- 1 kHz 1/200 100 ms 3 kHz
-2- 10 kHz 1/200 10 ms 10 kHz
-3- 10 kHz 1/1000 50 ms 10 kHz
-4- 10 kHz 1/10000 500 ms 10 kHz
C426* Gain adjustment
frequency input E1
100.0 -200.0 {0.1 %} 200.0
C427 Offset adjustment
frequency input E1
0.0 -12.5 {0.1 %} 12.5
Function Select a digital frequency of 0 Hz ... 10 kHz as setpoint or as actual value using terminal E1.
WithC007 = -28- ... -45-, -48-, -49-, -50-, -51-, the terminal E1 isconfiguredforthisfunction.
Adjustment
C425
- Selection of the frequency to be assigned to terminal E1.
- Resolution and scanning time for reading the frequency.
C426
- Sets the gain of the input signal. 100 % corresponds to a gain factor = 1.
- If E1 is used as actual value, C426 must be set as positive value, e.g. for pressure control, if the
motor speed is to increase when the pressure falls.
C427
- Sets the offset of the input signal.
- If C427 = -12.5 %, an offset of -20 % is internally set for the input.
Select input E1 for master current 4 mA ... 20 mA:
- Use an analogplug-in module 8279.
- Set C426 = 125 %.
- Set C427 = -12.5 %.
Important
When using the analog input module 8279 for the frequencyinput E1:
- Set C425 = -2-, -3- or -4-.
WithC005 = -0-, C425 andC426 are not active.
C425, C426, C427 are onlystoredinparameter set 1.
Special features
For higher accuracy requirements at 10 kHz digital frequency, select a higher resolution under
C425 taking into account the scanning time.
After additiontothe signal at terminal E1, the offset (C427)is onlyeffective as positive value
(see signal flow-chart inchapter 16.3.2, as of software version 3.0).
The digital frequency refers to internal normalisation (e.g. C011 etc.)
The maximum frequency is the maximum to be processed by the input E1. If the value is
exceeded, it must be adapted proportionally under C426.
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