VEGA Conductive electrodes - Manual (Page 36)

36 Conductive measuring system
Diagnosis
5 Diagnosis
5.1 Fault signal on VEGATOR 532 Ex
BR2
BR1
Soldering bridge for failure
adjustment of channel 2
The connection line from the mass and max.
electrode to the signal conditioning
instrument is generally monitored on line
break with Ex-measuring systems and
overfill protections.
If both channels are used for two separate
measurements (no double point control) the
electrodes are monitored, e.g. mass and
max. electrode of channel 1 to connection
point d30 and d32, mass and min. electrode
of channel 2 to connection point z30 and z32.
This division effects a channel specific fault
signal. This means in case of failure:
- The channel specific failure-LED lights
- The relay and the transistor output of the
failed channel deenergize and block
- The functions of the failed channel remain.
If conductive electrodes are used without Ex-
version (measuring system without Ex-
requirements) a resistor of 220 kOhm must
be mounted between mass and max.
electrode (between connection 1 and 2 ) for
monitoring of the connection line in the
connection box of the electrodes.
If this is not possible, it is necessary to close
a soldering bridge on the circuit board of the
signal conditioning instrument
- for channel 1 soldering bridge BR1 (14)
- for channel 2 soldering bridge BR2 (15)
Note
In this case the monitoring of the mass and
max. electrodes and the connection lines are
inactive. Therefore also the fault signal is
ineffective.
Soldering bridge for failure
adjustment of channel 1