ABLE BEKA BA504E, Инструкция по установке и обслуживанию

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16
7 . MAINTENANCE
7.1 Fault finding during commissioning
If an indicator 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
backlight, loop
powered, there
should be 3.4 to
5V between
terminals 3 & 12
with terminal 12
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.
All decimal points
flashing. Underrange if
–ve sign
displayed or
overrange. Recalibrate the
numerical display.
Unstable display 4/20mA input is
noisy. Eliminate ripple on
4/20mA power
supply and/or
decrease indicator
resolution.
Unable to enter
configuration
menu. Incorrect
security code
entered. Enter correct
security code, or
contact BEKA if
the code has been
lost.
7.2 Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
If an indicator fails after it has been functioning
correctly follow the procedure shown in section
7.1. If this 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.
7.3 Servicing
All BA504E and BA524E loop powered indicators
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.
7.4 Routine 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.
7.5 Guarantee
Indicators 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 possible, suggestions are
implemented.