Vega Capacitive electrodes EK … with signal conditionin Bedienungsanleitung PDF herunterladen (Seite 32)

32 Capacitive electrodes EK with signal conditioning instrument

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Sensor

Diagnosis

5.4 Failure removal

Failure Measure, failure removal

The red failure- Check the sensor inputs on the following failures:

LED of the signal - short-circuit on the input

conditioning instru- - sensor not correctly connected

ment lights - sensor line interrupted

- supply voltage too low

Check if the sensor is connected correctly.

- failures on the sensor, effecting a current change below 2 mA or

above 23 mA, trigger a fault signal on the signal conditioning instru-

ments.

Measure the current on the connection line to the sensor.

The terminal voltage of the sensor in standard condition is at least 12 V.

Note with Ex-systems that the Ex-protection is not influenced

by the measuring instruments.

a. Current value < 2 mA

- Check the supply voltage on the connection line to the sensor. The

voltage should be approx. 17 … 24 V.

Should you measure a value below 17 V, the signal conditioning in-

strument is defect. In this case send the instrument to VEGA for

repair.

- Should the red failure lamp continue to light, separate the connection

line from the signal conditioning instrument and connect a resistor of

2,2 kOhm to the sensor inputs of the signal conditioning instrument.

Should the failure lamp continue to light, the signal conditioning instru-

ment is defect. In this case return the instrument to VEGA for repair.

- Should the failure lamp extinguish, connect the signal conditioning

instrument again. Separate the sensor from the connection line and

connect instead a resistor of 2,2 kOhm.

- Should the failure lamp continue to light, perhaps the connection line

is interrupted. Check the connection line to the sensor.

- When the failure lamp extinguishes, the sensor is defect. Check the

connected sensor.

Signal conditioning

instrument e.g.

VEGATOR

4 … 20 mA 12 … 24 V

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Vega Capacitive electrodes EK … with signal conditionin Bedienungsanleitung Seite 32