VEGA VEGATOR 636 Ex Ship approvals - Manual (Page 22)

22
7 Maintenance and fault rectification
VEGATOR 636 Ex • Signal conditioning instrument
23446-EN-130627
Error Cause Rectification
The red failure control
lamp (LED) of the signal
conditioning instrument
lights
Current value < 2.3 mA – Measure the current value on the signal cable to the
sensor
– Check all connections and connection cables to the
sensor
– The voltage should be approx. 17 … 20 V
– If the value is below 17 V, probably the signal condi-
tioning instrument is defective.
– Exchange the signal conditioning instrument or send
it for repair
– If the red failure lamp continues to light, separate
the sensor from the connection cable and connect
a resistor of 1 kΩ instead on the signal conditioning
instrument
– If the failure lamp continues to light, the signal condi-
tioning instrument is defective
– Exchange the signal conditioning instrument or send
it for repair
– Should the failure lamp extinguish, you can connect
the sensor again. Separate the signal conditioning
instrument from the connection cable and connect a
resistor of 1 kΩ to the sensor input
– If the failure lamp continues to light, the connection
cable is probably interrupted
– Check the connection cable to the sensor
– Should the failure lamp extinguish, the sensor will be
defective
– Exchange the sensor or send it in for repair
The red failure control
lamp (LED) of the signal
conditioning instrument
lights
Current value > 23.2 mA Measure the current value on the signal cable to the
sensor
– Check all connections and connection cables to the
sensor
– If the red failure lamp continues to light, separate
the sensor from the connection cable and connect
a resistor of 1 kΩ instead on the signal conditioning
instrument
– If the failure lamp extinguishes, the sensor is defec-
tive. Check the connected sensor
– If the failure lamp continues to light, connect the sen-
sor again. Separate signal conditioning instrument
from the connection cable and connect a resistor of
1 kΩ to the sensor input.
– If the failure lamp extinguishes, this is probably due
to a shortcircuit in the connection cable
– Check the connection cable to the sensor
– If the failure lamp continues to light, the signal condi-
tioning instrument is defective
– Exchange the signal conditioning instrument or send
it for repair
Malfunction during func-
tion test
After pushing the test key,
the switching conditions
do not occur in the correct
sequence or correct du-
ration, e.g. no full signal is
outputted.
– Measure the line resistance
– If the cable is highly resistive, bring it to a normal
resistance, e.g. check terminals and cable connec-
tions on corrosion