BEKA BA364D, Руководство пользователя

Страница: 29 / 93

29
2.5.2 Function of instrument: ‘Function’
This is the first parameter in the programme
menu which conditions the instrument as a
counter, timer, tachometer or as a clock.
CAUTION
This function must be entered before any of
the other parameters are programmed. It
is protected by a password to prevent
accidental changes.
To define the instrument function select
‘Function’ from the main menu and press
P which
will reveal the existing setting. Pressing the Up
or Down button will scroll through the four
options:
Display Instrument function
‘CountEr’ Counter
‘CLOC’ Clock
‘tACHO’ Tachometer
‘ELAPSE’ Timer
With ‘CountEr’ selected, press P which will
change the display to ‘Set.nO’. To proceed
press
Up or Down which will change this prompt
to ‘Set.YES’ and then confirm the function
change by pressing
P which will result in a 'Set
0000'. Using the Up and Down buttons and the P
button to move to the next digit, enter the
password 'SurE'. Note 'S' is entered as '5'.
Finally, pressing
E will execute the function
change to a counter and return the display to the
'Function' prompt in the main menu.
2.5.3 Type of input: ‘InPut A’ and ‘InPut b’
To define an input type select ‘InPut A’ from the
menu and press
P which will reveal the current
input type. Pressing the Up or Down button will
scroll through the five options:
‘UOLts’ Voltage input
Threshold 1V and 3V
5kHz max.
‘COIL’ Low voltage
Threshold 20mV peak.
5kHz max.
‘Pr.dEt’ NAMUR proximity detector
Threshold 1.2 and 2.1mA
5kHz max.
‘COntACt’ Switch contact
Threshold 100 and 1000
100Hz max
‘OP.COL’ Open collector
Threshold 2k
and 10k 5kHz max.
5kHz max.
When the required type of input has been
selected press
E to enter the selection and return
to the ‘InPut A or b’ prompt in the main menu. To
count reliably, the input signal must fall below the
lower switching threshold and rise above the
higher switching threshold.
2.5.4 Input count mode: ‘Count’
This parameter defines the arithmetic relationship
between the two inputs A and B. The following
four modes may be selected
Display Input count mode
‘A : b’ Pulses on input A added to
pulses on input B
‘A : -b’ Pulses on input B
subtracted from pulses on
input A
‘A Con b’ Input B controls count
direction of input A.
Input B Input A
Low Up counter
High Down counter
‘A rEL b’ Quadrature input with
transducers electrically 90
o
apart. Note: Maximum input
frequency 2kHz.
The diagrams below show the voltage waveforms
at the two inputs and the resulting display when
the BA364D is programmed to count on a rising
edge.