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5.7 MAINTENANCE
5.7.1 Fault finding during commissioning
If a BA364D clock fails to function during
commissioning the following procedure should be
followed:
Symptom
Cause
Check:
No display
Incorrect
wiring
Note:
Terminals 2 &
8 are
interconnected
within the
BA364D
That there is
between 10 and
28V on terminals
1 & 2 with terminal
1 positive.
Display is
flashing
Display time
has not been
set
Section 5.5.4 and
set clock display
Displaying a
fixed time
Reset
terminals
connected
together
Wiring and reset
switch
Unable to
enter
programme
mode
Incorrect
security code
That correct
security code is
being used, or fit
security link in
override position.
See Fig 1.4
5.7.2 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 BA364D clock fails after it has been
functioning correctly, the following table may help
to identify the cause of the failure.
Symptom
Cause
Check:
No display
No power
supply.
That there is
between 10 and
28V on terminals 1
& 2.
Display is
flashing
Power
supply has
been
interrupted
Supply security
and set clock
display. See 5.5.4
Displaying a
fixed time
Remote
reset contact
closed
That remote reset
contact is not
closed or
associated wiring
damaged.
If this procedure does not reveal the cause of the
fault, it is recommended that the instrument is
returned to BEKA or to our agent in your area for
repair.
