Troubleshooting - Brüel & Kjaer Vibro ds822 Serie Mode D'emploi

6.2

Troubleshooting

Check the output signal
a. The output signal U
measuring range. Adjust the sensor so that it is nearer the target.
b. The output signal U
Possibly the distance between target and sensor tip is too small. Adjust the sensor to
increase the distance to the target and re-check U
the displacement sensor system is defective. Follow these additional steps.
Check the displacement sensor and the extension cable:
a. Measure the supply voltage I
connected. Disconnect the cable connected to the driver (terminal 1) and measure supply
voltage I again. If I
B
sensor are OK. Otherwise, there is a disruption in the displacement sensor or extension
cable.
b. Check the resistance of the extension cable and the displacement sensor:
For a 5 m system: R
For a 10 m system: R
Otherwise the displacement sensor or extension cable is defective.
Check the driver:
Measure the voltage (terminal 2) at the driver without the displacement sensor connected

and without cables. The result you should obtain is I
driver is defective.
© Brüel & Kjaer Vibro GmbH / 4 mm ds822 ATEX / 9.11.16 / technical specifications subject to change / C105070001 / V03
< -18 V. The distance between target and sensor tip lies outside the
SIG
> -2 V.
SIG
(terminal 2) with extension cable and displacement sensor
B
changes by about 1.4 mA, the sensor cable and the displacement
B
+ R = 9.6 Ω
sensor ext.
+ R = 13.6 Ω
sensor ext.
. If the output signal does not change,
SIG
0.3 Ω
±
0.3 Ω
±
= 8,7 mA +-1 mA . Otherwise, the
B
EN
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