Burkert 8041 - Choosing Relay Switching Way

43
Adjustment and commissioning
The wiring of the relay determines the function of the
relay: Normally Open (NO) or Normally Closed (NC).
The following parameters of the relay output can be set:
- the switching way: window or hysteresis (see chapter9.9.1)
- the value of the low switching threshold, as a percentage of
the full scale (see chapter9.9.2)
- the value of the high switching threshold, as a percentage of
the full scale (see chapter9.9.2)
- the time delay before switching: from 0 to 100 seconds (see
chapter9.9.3).
9.9.1. Choosing the switching way of the
relay output
Two switching ways of the relay are available, window or
hysteresis.
In window switching, the state of the relay output is changed
whenever one of the thresholds is detected (see Fig.34 and
Fig.35).
State of the relay output
deactivated
actived
Low threshold High threshold
m/s
Fig.34: Changeofstateoftherelayoutputinwindowswitching
witharelaywiredasNO
State of the relay output
deactivated
actived
Low threshold High threshold
m/s
Fig.35: Changeofstateoftherelayoutputinwindowswitching
witharelaywiredasNC
In hysteresis switching (see Fig.36 and Fig.37), the state of the
relay output is changed:
• when both the high threshold is detected and the uid velocity
increases;
• when both the low threshold is detected and the uid velocity
decreases.
State of the relay output
deactivated
actived
Low threshold High threshold
m/s
Fig.36: Changeofstateoftherelayoutputinhysteresis
switchingwitharelaywiredasNO
english
Type 8041