BEKA BA484DF, Руководство пользователя

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7. PROGRAMMING
The BA488CF only requires programming if the
standard display formats are not suitable and a
custom display format has to be designed.
The
Fieldbus Display Programming Guide , which may
be downloaded from the BEKA web site at
www.beka.co.uk , explains how to construct
custom screens and contains examples.
8. MAINTENANCE
8.1 Fault finding during commissioning
If a BA488CF fails to function during
commissioning the following procedure should be
followed:
Symptom Cause Check:
No Display Fieldbus not
powered
9 to 17.5V
between
terminals 1 & 2.
No variables Fieldbus not
configured
BA488CF does
not have correct
protocol
Instrument
configuration at
host
That the
BA488CF
protocol is the
same as the
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
Overange
Number Format
see section 6.3.2
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
see section 6.3.2
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 BA488CF 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, it is recommended that the instrument is
replaced.
8.3 Servicing
We recommend that faulty BA488CF Fieldbus
Displays 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, although
the inspection frequency should be adjusted to
suit the environmental conditions.
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.