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2.8 MAINTENANCE
2.8.1 Fault finding during commissioning
If a BA364ND counter fails to function during
commissioning the following procedure should be
followed:
Symptom
Cause
Check:
No display
Incorrect
wiring
Note:
Terminals 2, 4,
6 & 8 are
interconnected
within the
BA364ND
That there is
between 10 and
30V on terminals
1 & 2 with terminal
1 positive.
Total display
not counting
Incorrect
programming
or input wiring
That instrument
has been
programmed for
the transducer(s)
in use, and that
they are connected
to the correct
terminal with
correct polarity.
Total scale factor
No rate
display
Lower display
‘dISPLAY.2’
not switched
on.
Programming
see 2.3.7
Rate scale factor
Rate display
always zero
Reset
terminals
connected
together
Wiring & reset
switch.
Colon
appears
between digits
in display
Display has
overranged
Calibration and if
necessary reduce
number of digits
displayed.
Unable to
enter
programme
mode
Incorrect
security code
That correct
security code is
being used, or fit
security link in
override position.
See Fig 1.4
Rate and total
displays are
not direction
sensitive
Incorrect input
count mode or
transducer
Input count mode
and operation of
transducer
Presence of pulse
signal at both
inputs.
4/20mA
output is
constant
3.5mA
Counter
parameters
have been
changed
Programming of
4/20mA output
see 2.5.1
Re-
transmitted
pulse output
not working
Incorrect
programming
Counter is
programmed for
A + b input
see 2.3.4
2.8.2 Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
Live maintenance should only be
performed when there is no risk of a
flammable atmosphere being present
and dust and water can not enter the
enclosure. Before replacing control and
terminal covers ensure that the sealing
gaskets are undamaged and are free
from foreign bodies.
If a BA364ND counter fails after it has been
functioning correctly, the following table may help
to identify the cause of the failure.
Symptom
Cause
Check:
No display
No power
supply.
That there is
between 10 and
30V on terminals
1 & 2.
Rate display
always zero
Transducer or
associated
wiring has been
damaged.
Presence of
pulse signal at
input terminals .
Total display
not functioning
Remote reset
contact closed
That remote
reset contact is
not closed or
associated
wiring damaged.
Colon appears
between digits
in display
Display has
overranged
Calibration and if
necessary
reduce number
of digits
displayed.
Rate and total
displays are
not direction
sensitive
Damage to
transducer or
input wiring
Presence of
pulse signal at
input terminals.
If this procedure does not reveal the cause of the
fault, it is recommended that the instrument is
returned to BEKA associates or to our agent in
your area for repair.
