ABB ACQ80, Firmware Manual

Page: 72 / 390

72 Program features
When AI1 input voltage increases, up to 11 mA, the AI1 actual value (
12.11
)
displays zero. After AI1 input voltage reaches 11 mA, the AI1 actual value displays
11 mA and continues to display the detected value up to the maximum AI1 value
20 mA (
12.18
).
When AI1 input voltage decreases, the AI1 actual value displays the detected
value up to 9.0 mA. From 9.0 mA to zero, the AI1 actual value displays Zero till it
reaches 0V.
See the timing diagram below:
Dead-band function timing diagram
Settings
Parameter
12.110 AI dead band
(page
114
)
a
0.5
0.55
0.45
b
c
AI actual
12.11 / 12.21
12.18 / 12.28 AI max
AI max
12.18 / 12.28
AI input reference
a - Dead-band value
b - Hysteresis negative value
c - Hysteresis positive value