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10 Diagnostics and servicing
VEGABAR 28 • Three-wire 1 x transistor or 4 … 20 mA
57534-EN-220826
Since we offer this service worldwide, the support is provided in
English. The service itself is free of charge, the only costs involved are
the normal call charges.
10.3 Diagnosis, fault messages
Connect a multimeter in the suitable measuring range according to
the wiring plan. The following table describes possible errors in the
current signal and helps to eliminate them:
Error
Cause
Rectification
4 … 20 mA signal not
stable
Fluctuating measured value
Set damping
4 … 20 mA signal miss-
ing
Electrical connection faulty
Check connection, correct, if necessary
Voltage supply missing
Check cables for breaks; repair if nec-
essary
Operating voltage too low, load resist-
ance too high
Check, adapt if necessary
Short-circuit
Check, repair if necessary
Current signal great-
er than 22 mA, less than
3.6 mA
Sensor electronics defective
Replace device or send in for repair de-
pending on device version
The 360° status indication on the device (see chapter "
Configura-
tion
") shows the following:
•
Device status
•
Switching status of the transistor output
•
Operating status
5)
This enables simple on-site diagnosis without tools, see the following
table:
LED illuminated ring
Transistor output
Colour
6)
Permanent light
Flashing
Green
voltage supply on, operation with-
out failure
Message acc. to NE 107"
Mainte-
nance required
" available
open (high-resistance)
Yellow
-
closed (low-resistance)
Red
voltage supply on, operation with
failure
Message acc. to to NE 107 "
Function check
", "
Out of speci-
fication
" or "
Simulation state
" is
displayed
open (high-resistance)
Note:
For devices with M12 x 1 stainless steel plug, the 360° status indica-
tion is not available.
4 … 20 mA signal
LED illuminated ring
5) Signalling of process pressure ranges by colour and flashing, adjustable via
VEGA Tools app or PACTware/DTM.
6) Delivery status; adjustable via VEGA Tools app or PACTware/DTM
