BEKA BA688CF-F, Manual, Page: 14 / 15

6. MAINTENANCE
6.1 Fault finding during commissioning
If a BA688CF-F FOUNDATION™ fieldbus display
fails to function during commissioning the following
procedure should be followed:
Symptom Cause Check:
No Display Fieldbus not
powered
9 to 32V between
terminals 1 & 2.
No variables Fieldbus not
configured
BA688CF-F does
not have correct
protocol.
Instrument
configuration at
host.
That BA688CF-F
protocol is same
as fieldbus.
i.e. Fieldbus
Foundation or
Profibus PA.
Wrong variable
displayed
Wrong screen
selected
Other screens by
operating Up or
Down button
Display shows
‘?????’
Display
overrange
Number format
No backlight Brilliance turned
down
Setting in display
menu
Low or excessive
contrast
Incorrect contrast
setting
Setting in display
menu
Displayed
variable is
inverted
i.e. light digits on
dark background
Variable has
‘bad’ status
Configuration
and instrument
supplying
variable
Displayed
variable is
flashing
Associated alarm
has been
activated
Setpoints
Bargraph on
standard display
format is shown
dotted
Displayed
fieldbus variable
is outside
bargraph limits or
data is ‘bad’
Bargraph limits
6.2 Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
If a BA688CF-F fails after it has been functioning
correctly, the table shown in section 6.1 may help
to identify the cause of the failure.
If this procedure does not reveal the cause of the
fault, it is recommended that the instrument is
replaced.
6.3 Servicing
We recommend that faulty BA688CF-F
FOUNDATION™ fieldbus displays are returned to
BEKA associates or to our local agent for repair.
6.4 Routine maintenance
The mechanical and electrical condition of the
instrument should be regularly checked. Initially
annual inspections are recommended, although
the inspection frequency should be adjusted to suit
the environmental conditions.
6.5 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.
6.6 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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