Function Threshold With Current Detection - ABB SA/S 12.16.6.1 Product Manual

®
ABB i-bus KNX
4.1.1 Function threshold
with current detection
134 2CDC 505 056 D0207 | SA/S
Planning and application
The function current detection features two independent thresholds.
The detected current value will fluctuate by about 20 mA due to the
necessary analogue/digital conversion of the detected load current. In order
to avoid a continuous change of the threshold value state, the thresholds for
current recognition feature a hysteresis function. The width of the hysteresis
band is determined by the programmable hysteresis thresholds.
Example: Hysteresis curve, parameterization: overshoot 1 – undershoot 0
Detected current value
Threshold plus hysteresis
Threshold
Threshold minus hysteresis
Value of the communication object
Current status threshold x
Should the upper hysteresis threshold be overshot or the lower hysteresis
threshold be undershot, the value of the communication object Status
Current-Threshold x is modified and sent on the bus. This object value can
be parameterised in parameter window A: Current Detection.
1 0