VEGA WEIGHTRAC 31 4 … 20 mA_HART - four-wire - Manual (Page 60)

60
8 Diagnostics and service
WEIGHTRAC 31 • 4 … 20 mA/HART - four-wire
42374-EN-131119
Error Cause Rectification
4 … 20 mA signal
missing
Electrical connec-
tion faulty
Check connection according to
chapter "Connection steps" and if
necessary, correct according to chap-
ter "Wiring plan"
Voltage supply
missing
Check cables for breaks; repair if nec-
essary
Operating voltage
too low or load re-
sistance too high
Check, adapt if necessary
Current sig-
nal greater than
22 mA or less
than 3.6 mA
Instrument on fail-
ure message
Note error message on the display
and adjustment module
The following table describes possible faults that may not generate an
error message:
Error Cause Rectification
Instrument dis-
plays loading of
the conveyor belt.
However, the belt
is empty.
Loading fluctua-
tions
Carry out a zero rate determination
Instrument sums
up the material
quantity. However,
belt is empty.
Contamination,
buildup on the
conveyor belt
Activate leak volume suppression
Conveyor belt was
changed - belt
connections
Activate leak volume suppression
Inaccurate meas-
ured values
Changing product
density
Carry out linearization
Depending on the reason for the fault and the measures taken, the
steps described in chapter "Setup" must be carried out again or must
be checked for plausibility and completeness.
Should these measures not be successful, please call in urgent cases
the VEGA service hotline under the phone no. +49 1805 858550.
The hotline is also available outside normal working hours, seven
days a week around the clock.
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.
8.4 Exchanging the electronics module
If the electronics module is defective, it can be replaced by the user.
In Ex applications, only instruments and electronics modules with ap-
propriate Ex approval may be used.
Additional interferences
Reaction after fault recti-
fication
24 hour service hotline