BEKA BA577E, Manual

Page: 9 / 38

9
5. OPERATION AS A TIMER
When configured as a Timer the BA577E can
measure and display the elapsed time between
external events such as measuring and displaying
how long machinery is operating. The Timer can be
started and stopped by a remote sensor, or from the
front panel push buttons.
The addition of two optional factory fitted isolated
control outputs allows the Timer to control external
events such as opening a valve for a predetermined
time. Again the Timer can be started and stopped
by a remote sensor, or from the front panel push
buttons.
When controlling external events the
CYCLE
function
enables the BA577E Timer to be configured to
repeat the timing period up to 99 times with a
configurable delay between timed periods up to 100
hours or to repeat continuously.
The BA577E may be configured to time-up from
zero to the set time
5Et t
, or to time-down from the
set time to zero. The set time may be entered and
displayed in hours, minutes or seconds, or a
combination of units. Elapsed or remaining time is
continuously displayed and a separate display may
be activated to show the Timer set time
5Et t
.
Resetting the timer cycle can be accomplished via
the front panel push buttons or by a remote contact.
A grand total time is maintained which can be
viewed by operating the front panel push buttons. It
may be reset to zero from within the configuration
menu, or the instrument may be configured to allow
resetting from the front panel push buttons.
Fig 7 shows a simplified block diagram of the
BA577E when configured as a Timer. The input can
be configured to accept inputs from a wide variety of
sensors.
When the sensor requires energising to
detect it's state, such as a switch contact, open
collector or a two wire proximity detector, a link
connected between terminals 3 & 4 supplies power
to the sensor input.
The instrument can be supplied with the following
factory fitted accessories:
Internally powered Backlight
Dual isolated Control Outputs
The two factory fitted solid state isolated control
outputs may be independently configured to close
and open at specified parts of the timer cycle, such
as when the timer starts or finishes.
5.1 Initialisation
Each time power is applied to a BA577E
initialisation is performed. After a short delay the
following display sequence occurs:
All segments of the display are activated
BA577E is ready to start functioning using
the configuration information stored in the
instrument's permanent memory.
Fig 7 BA577E block diagram with Timer
configuration.