58
Fig 3.6 Control of valve in a hazardous area
The required programme parameters to achieve
this are shown below, others, such as whether
the second display is activated, are not critical.
Function
‘ELAPSE’
Timer
InPut A
‘ContACt’
Switch contact
InPut b
‘ContACt’
Switch contact
StArStOP ‘ControL 2’ Closure operates
SEt t
Time required
uP or dn
‘uP’
Up counter
OP1
EnbL
On
Enable control OP1
OP1:On
StArt
On when timer is
started.
OP1:OFF StOP
Off when timer is
stopped.
OP1:dELA 00000
No delay required
OP2
EnbL
On
Enable control OP2
OP2:On
SEt t
On at set time SEt t
OP2:OFF rESEt
Off at rESEt
OP2:dELA 00005
5 second delay
Note:
When the elapsed time (T1+T2) equals
the set time SEt t, an internal stop signal is
automatically generated which stops the timer
and opens control output 1.
3.8 MAINTENANCE
3.8.1 Fault finding during commissioning
If a BA364D timer fails to function during
commissioning the following procedure should be
followed:
Symptom
Cause
Check:
No display
Incorrect
wiring
Note:
Terminals 2, 4,
6 & 8 are
interconnected
within the
BA364D
That there is
between 10 and
28V on terminals
1 & 2 with terminal
1 positive.
Timing cycle
will not start
Elapsed or
remaining
time display
not changing
Incorrect
programming
or input wiring.
Timer is being
permanently
reset.
Stop input is
activated.
That instrument
has been
programmed as a
timer for the
transducer(s) in
use, and that they
are connected to
the correct
terminals with the
correct polarity.
That reset terminal
7 & 8 are not
connected
together.
Input at terminals 5
& 6
Timing cycle
will not stop
Incorrect
programming
or input wiring
That SEt t has
been programmed
for the required
cycle time.
No set time
display
Lower display
‘dISPLAY.2’
not switched
on.
Programming
See 3.5.7
Control
outputs do not
function
If control
output
annunciators
are operating.
Incorrect
programming.
Incorrect
wiring or
polarity.
That control output
is enabled and
programmed to
operate on
required
parameter.
See 3.6.2 & 3.
Wiring
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
