BEKA BA458C, Manual

Page: 33 / 45

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8. MAINTENANCE
8.1 Fault finding during commissioning
If a BA458C fails to function during
commissioning the following procedure should
be followed:
Symptom Cause Check:
No Display No Power
Incorrect wiring
No Zener barrier,
galvanic isolator
or resistor in
series with power
supply. See 4.2.1
That there is at
least 11 volts
between terminal
1 and 2.
Terminal 1
should be
positive.
Front panel
pushbuttons do
not function.
Batch controller
conditioned to
operate with
remote switches.
User Controls
configuration.
BA458C will not
count input
pulses or
integrate 4/20mA
input.
Input not
correctly
configured.
Input connected
to wrong
terminals or
reversed.
Incorrect
electrical level
Signal input
configuration.
Input terminals
That pulse input
exceeds batch
controller’s input
switching
thresholds.
4/20mA loop can
tolerate 0.6V
drop introduced
by the batch
controller.
Control 1 is not
energised and
screen does not
display ‘Running’
when Start
button is
operated.
Batch size
setpoint not
entered.
Batch setpoint.
Enter or select
the correct batch
setpoint.
BA458C
continues to
count after batch
size setpoint is
reached.
The BA458C will
only stop
counting when
input pulses stop,
or 4/20mA input
current falls to
4mA.
Note: The
control loop must
be closed so that
the batch
controller
output(s) control
the input signal.
Configuration
menus are not
accessible.
Security link
missing and / or
security code not
entered.
That terminals 18
& 19 are joined
together.
Enter four digit
security code.
Function missing
from sub-menu.
Functions
dependent on
higher level
functions are
removed from
the menu if the
higher level
function is not
selected.
That related
higher level
function has
been selected.
Batch controller
is not performing
as anticipated.
Incorrect
configuration.
Information menu
that lists all the
configuration
settings.
The Information sub-menu, which is described
in section 6.2 and Appendix 2, lists all the
batch controller configuration settings. This
provides a rapid way of checking that the
instrument has been correctly configured.
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 BA458C fails after it has been functioning
correctly, the table shown in section 8.1 may
help to identify the cause of the failure.
If this procedure does not reveal the cause of
the fault, please contact BEKA or our local
agent.
8.3 Servicing
We recommend that faulty BA458C batch
controllers are returned to BEKA associates or
to our local agent for repair.
8.4 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.
See sections 6.4.4 and 6.4.5 if the batch
controller’s 4/20mA input is being used.
8.5 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.
8.6 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.
9. ACCESSORIES
9.1 Tag number
The BA458C can be supplied with a thermally
printed tag number on the rear panel. This tag
number is not visible from the front of the
instrument after installation.