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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