44
9 Maintenance and fault rectification
VEGACAL 69 • Two-wire 4 … 20 mA/HART
31178-EN-200929
Error
Cause
Rectification
4 … 20 mA signal missing Wrong connection
Check connection according to chapter "
Connection
steps
" and if necessary, correct according to chapter "
Wiring plan
"
Voltage supply missing
Check cables for breaks; repair if necessary
Operating voltage too low
or load resistance too high
Check, adapt if necessary
Current signal greater than
22 mA or less than 3.6 mA
Shortcircuit in the probe,
e.g. because of moisture in
the housing
Remove the electronics module. Check the resistance
between the marked plug connections. See the follow-
ing instructions.
Sensor electronics de-
fective
Exchange the instrument or send it in for repair
Remove the electronics module. Check the resistance between the
two plug connections.
There must no longer be a connection (high impedance). If there is
still a connection, exchange the instrument or return it for repair
1
2
3
Fig. 28: Check the resistance in the probe
1 Shielding
2 Measuring probe
3 Ground potential
In Ex applications, the regulations for the wiring of intrinsically safe
circuits must be observed.
Check the resistance in
the probe
Summary of Contents for VEGACAL 69
Page 14: ...14 4 Mounting VEGACAL 69 Two wire 4 20 mA HART 31178 EN 200929 Fig 6 Inflowing medium...
Page 57: ...57 Notes VEGACAL 69 Two wire 4 20 mA HART 31178 EN 200929...
Page 58: ...58 Notes VEGACAL 69 Two wire 4 20 mA HART 31178 EN 200929...
Page 59: ...59 Notes VEGACAL 69 Two wire 4 20 mA HART 31178 EN 200929...