BEKA BA354NE, Руководство пользователя

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9. MAINTENANCE
9.1 Fault finding during commissioning
If an Rate Totaliser fails to function during
commissioning the following procedure should be
followed:
Symptom Cause Solution
No display Incorrect wiring Check wiring
There should be
0.6 to 1.2V
between terminals
1 & 3 with terminal
1 positive.
With an optional
loop powered
backlight, there
should be 3.4 to
5V between
terminals 1 & 13
with terminal 1
positive.
No display
0V between
terminals 1 & 3.
Incorrect wiring
or no power
supply
Check supply
voltage and
voltage drop
caused by all the
instruments in the
loop.
Rate display
showing
-99999 or 99999
with all decimal
points flashing
Over-range The rate display
has been
incorrectly
calibrated & is
trying to display a
number outside
the range
–99999 to 99999.
Recalibrate rate
display.
Total display
showing
-9999999 or
99999999 with all
decimal points
flashing
Over-range
Reset total display
to zero.
Unstable display 4/20mA input is
noisy.
Eliminate ripple on
4/20mA power
supply and/or
decrease Rate
Totaliser
resolution.
Unable to enter
configuration
menu.
Incorrect
security code
entered.
Enter correct
security code, or
contact BEKA if
the code has been
lost.
9.2 Fault finding after commissioning
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 an Rate Totaliser fails after it has been functioning
correctly follow the procedure shown in section 9.1.
If this does not reveal the cause of the fault, it is
recommended that the instrument is replaced.
9.3 Servicing
All BA354NE loop powered Rate Totalisers are
interchangeable if the required optional backlight
and alarms are fitted. A single spare instrument
may quickly be recalibrated to replace any
instrument that is damaged or fails. No attempt
should be made to repair instruments at component
level.
We recommend that faulty instruments are
returned to BEKA associates or to your
local BEKA agent for repair.
9.4 Routine maintenance
Routine maintenance should comply with the
recommendations contained in BS EN 6007-17
‘Electrical Installations Inspections and
Maintenance’. The mechanical condition of the
instrument and electrical calibration should be
regularly checked. The interval between inspections
depends upon environmental conditions. We
recommend that initially instrument calibration
should be checked annually.
9.5 Guarantee
Rate Totalisers 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.
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