Wiring 13 – Rockwell Automation 840E Solid-State Level Sensors User Manual
Page 15
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Wiring
13
4.2.2
AC Operation
Figure 4.4: AC Operation
Green light ON:
Sensor is connected to power supply and operational
Red light ON:
Mode of operation MAX (overfill protection): sensor is immersed in liquid
Mode of operation MIN (dry running protection): sensor is immersed in liquid
Green light OFF:
Error: No power supply
- Check plug, cable and power supply
Red light flashing:
Error: Overload or short-circuit in load circuit
- Rectify the short circuit
- Reduce maximum load current to below 250 mA
Error: Internal sensor error or sensor corroded
-Replace device
MAX
MIN
50...60 Hz
L1
V
2
1
<
V
2
1
<
U
< 4 mA
< 4 mA
U
N
L1
N
L1
N
L1
N
1
1
1
1
2
3
3
2
I
I
I
I
U
~
(AC)
1
3
1
3
1
2
1
2
Light On
Light Off
Green
Red
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