Over & Under-Range; Maintenance; Fault Finding During Commissioning; Fault Finding After Commissioning - BEKA BA405C Manual

6.1.6 Over and under-range
The BA405C can display numbers between -
1999 and 1999. If this range is exceeded the three
least significant digits will be blanked.
range is indicated by -1 and over-range by 1.

7. MAINTENANCE

7.1 Fault finding during commissioning

If a BA405C set point station fails to function
during commissioning the following procedure
should be followed:
Symptom Cause
No loop Incorrect
current wiring or no
power supply
BA405C Positive
displays 1 over-range
BA405C Negative
displays -1 over-range
Unstable Insufficient
loop supply
current voltage
Unstable Power supply
display has voltage.
ripple

7.2 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.
Under-
Solution
Check wiring
and power
supply polarity
The display has been
incorrectly calibrated
& is trying to show a
number greater than
1999.
The display has been
incorrectly calibrated
& is trying to show a
number less than
-1999.
Check that voltage
between terminals
1 & 3 is greater than
6.1V, or 10V between
terminals 1 & 13 if a
loop powered
backlight is fitted.
Reduce ripple
10
If a BA405C fails after it has been functioning
correctly, the following procedure should be
followed:
Symptom Cause
No loop Wiring or power Check wiring
current supply fault
Unstable Insufficient
loop supply
current voltage
Unstable Power supply
display has developed
voltage ripple
If this procedure does not reveal the cause of the
fault, it is recommended that the BA405C manual
set point station is replaced with a spare
instrument.

7.3 Servicing

We recommend that faulty BA405C set point
stations are returned to BEKA associates or to our
local agent for repair.
7.4 Routine maintenence
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.

7.5 Guarantee

Set point stations 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.

7.6 Customer comments

BEKA associates is always pleased to receive
comments from customers about our products and
services. All communications are acknowledged
and whenever
implemented.
Solution
and power
supply
Check that voltage
between terminals
1 & 3 is greater than
6.1, or 10V between
terminals 1 & 13 if fitted
with a loop
backlight.
Reduce ripple
possible, suggestions
powered
are