BEKA BA377E, Manual

Page: 18 / 62

18
6. OPERATION AS A TIMER
When configured as a Timer the BA377E 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 with a
continuous output, 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 BA377E 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 BA377E 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 12 shows a simplified block diagram of the
BA377E when configured as a Timer. The input can
be configured to accept inputs from a wide variety of
sensors. When the sensor requires energising,
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.
6.1 Initialisation
Each time power is applied to a BA377E initialisation
is performed. After a short delay the following
display sequence occurs:
All segments of the display are activated
BA377E is ready to start functioning using
the configuration information stored in the
instrument's permanent memory.
Fig 12 BA377E block diagram with Timer
configuration.