15
Using the
Up
,
Down
and
P
push-
buttons enter the required zero display
of -50.0 Press
E
to return to the
'ZErO' prompt.
Again with any input current between 4
and 20mA press the
Up
push-button
and the indicator will display 'SPAn'.
Press
P
to reveal the existing span
display. Using the
Up
,
Down
and
P
push-buttons enter the required span
display of 1050.0 Press
E
to return to
the 'SPAn' prompt.
Press
E
again to
return to the main menu.
Step 7
Return to display mode
Following completion of calibration
return to the display mode by pressing
'E
'.
8. MAINTENANCE
8.1 Fault finding during commissioning
If a BA324D fails to function during commissioning
the following procedure should be followed:
Symptom Cause Solution
No display
Incorrect
There should be 1V
wiring
between terminals 1 &
3 with terminal 1
positive.
No display
Incorrect
Check that a current
and no volts
wiring or
is flowing in the loop.
between
no power
terminals
supply.
1 and 3.
Insufficient
Check supply voltage
loop voltage and voltage drops
to operate
caused by all
indicator
components in the loop.
Indicator
Positive
The indicator has been
displays 1
over-range
incorrectly calibrated &
is trying to display a
number greater than
19999.
Indicator
Negative
The indicator has been
displays -1
over-range
incorrectly calibrated &
is trying to display a
number less than
-19999.
Unstable
4/20mA input Check loop supply
display
has a large
voltage.
ripple content.
Unable to
Incorrect
Enter correct security
enter the
security
code or fit security
programme
code
link in override position.
mode
entered.
See Fig 7.
8.2 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 BA324D fails after it has been functioning
correctly, the following table may help to identify
the cause of the failure.
Symptom Cause Solution
No display
No power
Check that a current
and no volts
supply
is flowing in the loop.
between
terminals
1 and 3.
Unstable
4/20mA input Check loop supply
display
has a large
voltage.
ripple.
Incorrect
Digital filter
Recalibrate
calibration
FrE has been
changed after
indicator was
calibrated.
If this procedure does not reveal the cause of the
fault, it is recommended that the instrument is
replaced. This can be done without disconnecting
power, but while the indicator is disconnected the
4/20mA loop will be open circuit. Alternatively the
electronic assembly may be exchanged as
described in section 8.3
8.3 Servicing
We recommend that faulty instruments
and instrument assemblies are returned
to BEKA associates or to our local agent
for repair.
Electronic components must not be
replaced or repaired on site.
To simplify servicing all BA324D indicators use a
common display assembly. Depending upon the
accessories fitted, one spare display assembly
may be used to repair any BA324D which fails.
The exchange may be made without disconnecting
power, the 4/20mA loop will continue to function
but the indicator voltage drop will increase from 1V
to 4V without the display assembly.
