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3.6.4 Control output off at:
‘OP1:OFF’ and ‘OP2:OFF’
The control outputs may be programmed to turn
off (open)
when the timer is started, stopped,
reset or the elapsed time equals the programmed
set time. To define when a control output opens
select ‘OP1:OFF’ or ‘OP2:OFF’ from the control
output sub-menu and press
P
which will reveal
the current setting. Pressing the
Up
or
Down
button will scroll through the four options:
Display Control output closes when
‘StArt’
The timer is started
‘StOP’
The timer is stopped
‘rESEt’
The timer is reset
‘SEt t’
The elapsed time equals set
time setpoint SEt t.
When the required option has been selected
press
E
to enter the selection and return to the
control output sub-menu.
Note:
When the timer elapsed time equals the
set time ‘SEt t’, an internal stop signal is
automatically generated and all actions
associated with STOP are performed.
3.6.5 Output on delay time:
‘OP1:dELA’ and ‘OP2:dELA’
Both control outputs may be independently
delayed from turning-on for a fixed time following
the selected condition occurring. e.g. when the
timer is started. This delay can be programmed
in 1 second increments up to 32,400 seconds
which is 9 hours. If a delay is not required zero
should be entered. To adjust the delay select
'dELA' from the control output sub-menu and
press
P
which will reveal the existing delay time.
Each digit of the delay can be adjusted using the
Up
and
Down
push-buttons, and the
P
button to
move to the next digit. When the required delay
has been entered, press
E
to return to the alarm
menu.
When the delay function is used the front panel
control output annunciator will start flashing when
the programmed switching condition occurs. It
will continue flashing until the delay time has
expired, when the control output will close and
the annunciator will be continuously activated.
3.7 APPLICATIONS
The BA364D timer is a versatile instrument which
can perform a wide variety of hazardous area
timing applications. BEKA engineers will be
pleased to help with the design of your BA364D
timing system be it a simple manually controlled
stopwatch, or a more complicated control
application.
Figure 3.5 shows how a BA364D timer may be
used to measure how long a hazardous area
contact is closed. This illustrates how the timer
may be started and stopped by one input.
Fig 3.5 Starting & stopping timer with one input
The required programme parameters to achieve
this are shown below, others are not critical.
FunCtion ‘ELAPSE’
Timer
InPut A
‘ContACt’
Switch contact
StArStOP ‘ControL 4’ Closure operates
The second example in Fig 3.6 shows how the
timer may be configured to open an intrinsically
safe solenoid valve for a defined time. When the
start button is operated the timer starts to count
up and control output 1 is closed which opens the
solenoid valve. In this example the stop button
functions as a pause control which closes the
valve until the start button is again operated.
When the total elapsed time equals the set time,
‘SEt t’, control output 1 opens thus closing the
solenoid valve.
In this example control output 2 has been wired
to the timer reset terminals and programmed with
a five seconds control output delay. Therefore
five seconds after the timing cycle has been
completed the system automatically resets and is
ready for the next timing cycle.
