VEGA VEGATOR 622 - Manual (Page 19)

VEGATOR 620 … 622 19
Failure Rectification / Measure
VEGATOR 620
functions incorrectly
or not at all
Red failure LED
of VEGATOR 621
or 622 lights
b. Current value > 22 mA
- Check all connections and the connection cable to the sensor.
- Should the red failure lamp continue to light, separate the sensor
from the connection cable and connect a resistor of 2.2 kOhm in its
place.
If the failure lamp extinguishes, the sensor is defective. Check the
connected sensor.
- Should the failure lamp continue to light, reconnect the sensor. Sepa-
rate the signal conditioning instrument from the connection cable and
connect a resistor of 2.2 kOhm to its sensor input.
- Should the failure lamp continue to light, the signal conditioning instru-
ment is defective. In such a case, return the instrument for repair to
VEGA.
- If the failure lamp extinguishes, there is probably a short circuit in the
connection line. Check the connection cable to the sensor.
Note:
A flawlessly operating VEGATOR… has the following switching point values:
Potentiometer position
Sensor current
0 approx. 4 mA
5 approx. 12.5 mA
10 approx. 21 mA
Diagnostics