BEKA BA577E, Manual

Page: 5 / 38

5
Switch contacts, proximity detectors and open
collector sensors require energising which is
achieved by linking terminals 3 and 4 together as
shown in Fig 1.
2.2.1 Switch contact input
Any switch contact may be directly connected to
input terminals 5 & 6.
The BA577E contains a
configurable debounce circuit to prevent false
triggering of the instrument. Three levels of
debounce protection are available.
See section
5.5.6.
2.2.2 Open collector input
Any sensor with an open collector output such as an
opto-isolator may be directly connected to input
terminals 5 & 6.
The BA577E contains a
configurable debounce circuit to prevent false
triggering. Three levels of debounce protection are
available. See section 5.5.6.
2.2.3 2-wire proximity detector input
Most NAMUR 2-wire proximity detectors may be
connected to the BA577E sensor input, providing
the minimum operating voltage of the proximity
detector is less than 7.5V. The BA577E contains a
configurable debounce circuit to prevent false
triggering of the instrument. Three levels of
debounce protection are available.
See section
5.5.6.
2.2.4 Magnetic pick-off input
CoiL
in the input configuration menu is a low level
voltage pulse input intended for use with a magnetic
pick-off
sensor. The BA577E contains a
configurable debounce circuit to prevent false
triggering of the instrument. Three levels of
debounce protection are available.
See section
5.5.6.
2.2.5 Voltage pulse input
Two voltage pulse input ranges are independently
selectable in the BA577E Timer configuration menu,
VoLt5 L
and
VoLt5 H
. The BA577E contains a
configurable debounce circuit to prevent false
triggering of the instrument. Three levels of
debounce protection are available.
See section
5.5.6.
2.3 Remote reset
Connecting the external reset terminals RS1 and
RS2 together will reset the BA577E total display
when configured as a Timer and synchronise the
displayed time when configured as a Clock.
Remote resetting may be accomplished by any
switch
Note: When used as a Timer the BA577E may also
be reset from the display mode by operating the
&
and
*
push buttons simultaneously for more
than two seconds. See 5.5.19
2.4 Control outputs (optional)
Each of the two factory fitted optional control outputs
is a galvanically isolated single pole solid state
switch as shown in Fig 2. The outputs are polarised
and current will only flow in one direction. Terminals
A1 and A3 should be connected to the positive side
of the supply.
Note: Because of the series protection diode some
test meters may not detect a closed alarm output
Fig 2 Equivalent circuit of each control output
The solid state output of each alarm may be used to
switch any circuit with parameters equal or less
than:
V max = 30V
I max = 200mA
Fig 3 Typical control output application