BEKA BA364G, Manual

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8. MAINTENANCE
8.1 Fault finding during commissioning
If a BA367NE fails to function during commissioning
the following procedure should be followed:
Symptom Cause Check:
No display No power supply,
or incorrect
wiring.
Note: Terminals 2,
6 & RS2 are
interconnected
within the
instrument.
That there is
between 10 and
30V on terminals
1 & 2 with
terminal 1
positive.
Counter is
receiving power
but pulse input
indicator not
rotating.
No input pulses,
incorrect input
configuration,
incorrect linking of
terminals 3 & 4.
Input
configuration.
Linking of
terminals 3 & 4.
That input signal
polarity is correct.
Pulse input
indicator rotating
but incorrect rate
display.
Incorrect rate
display calibration
5CALE.r
t-bA5E
Pulse indicator
indicator rotating
but incorrect total
display.
Incorrect total
display
calibration.
Remote reset
switch contacts
closed.
5CALE.t
That RESET
annunciator is not
activated. If it is,
check reset wiring
and switch.
Unstable rate
display
Noisy pulse input
signal
Eliminate source
of electrical noise.
Increase
debounce and/or
display filter.
Unable to enter
configuration
menu.
Incorrect security
code
That the correct
security code is
being used.
Contact BEKA if
code is lost.
Optional 4/20mA
or pulse output
does not function
Output has been
disabled following
configuration
change
Re-enable output
Optional alarms
do not function
Alarms have been
disabled following
configuration
change.
Re-enable both
alarms.
8.2 Fault finding after commissioning
EN 60079-17 Electrical installations inspection and
maintenance permits live maintenance in Zone 2 if a
risk analysis demonstrates that this does not
introduce an unacceptable risk. The removal of
covers [opening of Ex n enclosure] is permitted if this
can be done without contaminating the interior of the
instrument with dust or moisture. Some end-users
may prefer not to permit live maintenance to
minimise risk.
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
Live maintenance within the hazardous area
should only be performed when it is
permitted by risk analysis, or when there is
no risk of a flammable atmosphere being
present.
If a BA367NE 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 with
terminal 1 positive
Pulse input
indicator not
rotating.
No input pulses Output from
sensor.
Wiring between
sensor and
BA367NE
Counter
Unstable rate
display
Noisy pulse input
signal
Locate source of
electrical noise, or
increase
debounce and
rate display filter.
If this procedure does not reveal the cause of the
fault, it is recommended that the instrument is
replaced.
8.3 Servicing
We recommend that faulty BA367NE Counters are
returned to BEKA associates or to our local agent for
repair.
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