BEKA BA577E, Manual

Page: 16 / 38

16
5.5.3 Instrument function:
FunCtion
The BA577E may be configured as a Timer or as a
Clock.
This section of the instruction manual
describes the Timer, for details of Clock
configuration see section 8.
To reveal the existing function of the instrument
select
FunCtion
from the configuration menu and
press
(
. If
ELAP5E
is displayed, the instrument is
already configured as a Timer therefore press
)
to
return to the
FunCtion
prompt in the configuration
menu. If
CloC
is displayed, press the
*
or
&
button to change the setting to
ELAP5E
followed by
the
(
button which will result in a
0000
prompt
being displayed with the first digit flashing. This is a
request for the instruction to be confirmed by
entering
5urE
using the
&
and
*
buttons to adjust
the flashing digit and the
(
button to move control
to the next digit. When
5urE
has been entered,
pressing
)
will reconfigure the instrument to a
Timer and return the display to
FunCtion
in the
configuration menu.
5.5.4 Input:
inPut
The
inPut
function contains two sub-functions
inP . tYPE
which defines the type of sensor that may
be connected to the input and
dEbounCE
which
adjust the amount of input noise rejection.
5.5.5 Input type:
inP . tYPE
inP . tYPE
is a sub-menu in the
inPut
function which
defines the type of input sensor that may be
connected to the input. To check or change the type
of input, select
inPut
in the configuration menu and
press
(
which will reveal the
inP . tYPE
prompt,
pressing
(
again will show the existing input type.
If set as required press
)
twice to return to the
configuration menu, or repeatedly press the
*
or
&
button until the required type of input is
displayed and then press
)
twice to return to the
configuration menu.
One of following six types of input may be selected:
Display Input type Switching
thresholds
Low High
oPCoL
Open collector² 2 10k Ω
VoLt5 L
Voltage pulse low¹ 1 3V
VoLt5 H
Voltage pulse high¹ 3 10V
CoiL
Magnetic pick-off 0 40mV
Pr . dEt
Proximity detector² 1.2 2.1mA
ContACt
Switch contact² 100 1000 Ω
Notes:
1. Maximum voltage input +30V.
2. For sensors that require energising i.e.
proximity detectors, switch contacts and
those with open collector outputs, terminals
3 & 4 of the BA577E Timer should be linked
together.
3. For the Timer to function correctly, the input
signal must fall below the lower switching
threshold and rise above the higher
switching threshold for the times shown in
the debounce section 5.5.6 below.
5.5.6 debounce:
dEbouncE
dEbouncE
is an adjustable sub-menu in the
inPut
function which prevents the Timer mis-functioning
when the input has noisy edges, such as those
resulting from a mechanical contact closing and
bouncing.
Three levels of protection may be
selected and the amount of debounce applied
depends upon the type of Timer input that has been
selected in the
inP . tYPE
function.
The following table shows the minimum time that the
input signal must be continuously above the upper
input switching threshold and continuously below the
lower switching threshold to ensure that the Timer
processes the input signal.
Input switching
thresholds are shown in section 5.5.5.
Debounce
level
Min input pulse width
Type of Input
Contact All others
Default 1600µs 40µs
Heavy 3200µs 350µs
Light 400µs 5µs