ABB ACS280, Firmware Manual, Page: 87 / 430

Program features 87
Settings and diagnostics
Parameters 96.02 Pass code (page 272 ) and 96.100 … 96.102 .
Events: -
 AI dead band
User can define a dead band value ( 12.110 ) for the analog input signals. The
value is valid both for analog input AI1 and AI2, and both for the voltage and
milliampere signals. The dead band value of 100% corresponds to 10 V for a
voltage signal and 20 mA for a current signal.
• In case of voltage: 10 V x (parameter
12.110
value) x 0.01
• In case of current: 20 mA x (parameter
12.110
value) x 0.01
The control program automatically calculates a hysteresis value for the AI dead
band:
• AI dead band hysteresis value = AI dead band value x 0.1
Example
Parameter 12.110 ( AI dead band ) value is set to 50%.
In case of voltage signal:
• AI unit selection = V
• AI dead band value = 10 x 50 x 0.01 = 5 V
• AI Hysteresis value = 5 x 0.1 = 0.5 V
• Hysteresis positive value = 5 + 0.5 = 5.5V
• Hysteresis negative value = 5 - 0.5 = 4.5V
Now, when AI input voltage is increasing up to 5.5 V, AI actual shows 0. As soon
as AI input voltage reaches 5.5 V, AI actual shows 5.5 V and continues to detect
the AI input voltage up to AI max which is in range of 0 V to 10 V. When AI input
voltage is decreasing, AI actual shows the actual AI applied up to 4.5 V. As soon
as AI input goes below 4.5 V, AI actual shows 0 till input voltage reaches 0 V.