BEKA BA337E, Manual

Page: 37 / 61

9. MAINTENANCE
9.1 Fault finding during commissioning
If a BA337E or a BA338E 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
28V on terminals
1 & 2 with
terminal 1
positive.
Rate Totaliser is
receiving power
but flow 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.
Flow indicator
rotating but
incorrect rate
display
Incorrect rate
display calibration
FACtor
5CALE . r
t-bA5E
Flow indicator
rotating but
incorrect total
display
Incorrect total
display
calibration.
Remote reset
switch contacts
closed
FACtor
5CALE . t
That RESET
annunciator is not
activated. If it is,
check reset wiring
and switch.
Flow indicator
rotating, but zero
rate display, no
totalisation and
HOLD
annunciator
activated.
Clip off
is
activated
CLP oFF
and if
necessary adjust
threshold.
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.
Clip-off does not
function
Clip-off has
automatically
reset to zero
following change
of rate display
calibration.
Reconfigure
clip off
Alarms do not
function
Alarms have been
disabled following
calibration
change
Re-enable both
alarms.
9.2 Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
Live maintenance is permitted on
intrinsically safe equipment installed in a
hazardous area, but only certified test
equipment should be used unless a gas
clearance certificate is available.
If a BA337E or a BA338E 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
28V on terminals
1 & 2
Flow indicator not
rotating
No input pulses Output from
flowmeter.
Wiring between
flowmeter and
Rate Totaliser.
Flow indicator
rotating, rate
display is zero
and totalisation.
HOLD
annunciator is not
activated.
Input below
clip-off threshold.
Clip off
threshold and if
necessary adjust.
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.
9.3 Servicing
We recommend that faulty BA337E and BA338E
rate totalisers are returned to BEKA associates or to
our local agent for repair.
9.4 Routine maintenance
The mechanical and electrical condition of the
instrument should be regularly checked.
Initially
annual inspections are recommended, but the
inspection frequency should be adjusted to suit the
environmental conditions.
9.5 Guarantee
Instruments which fail within the guarantee period
should be returned to BEKA associates or our local
agent. It is helpful if a brief description of the fault
symptoms is provided.
9.6 Customer comments
BEKA associates is always pleased to receive
comments from customers about our products and
services.
All communications are acknowledged
and whenever possible, suggestions are
implemented.
37