Weidmüller PTX800D Quick Start Manual

Q
UICKSTART
QS61001050 • 08/2004
Operation
General
The PTX800D is a scalable pulse counter/rate indicator for digital pulse
signals. It will display either the rate or total according to setup. The
other value is displayed when you hold down the TOTAL/RATE key.
For more complex applications, the PTX800D can be supplied with
two alarm channels and/or an analogue retransmit output.
Alarm conditions are indicated by the LEDs above buttons marked AL1
(for alarm channel one) and AL2 (for alarm channel two).
Manually clearing tripped alarms
The alarm channels can be set for automatic or manual reset. For
manual reset, the LED will flash when an alarm trips. These alarms will
only clear if you have acknowledged the alarm and the trip condition
has cleared. Press AL1 or AL2 to acknowledge the alarm.
Viewing the alarm setpoints
Press the AL1 or AL2 at any time to display the setpoint for that
channel. The value will be shown for 5s. If the alarms are disabled,
pressing the key will have no effect.
Changing the alarm setpoints
Press PGM while the setpoint is on display (see above), you will be able
to change the value using the ì and Å keys. To save the changes,
press PGM. Note: you can disable this feature during setup for greater
security.
Checking the Rate/Total
You can set up the PTX800D to show either total or rate. If the total
is normally on display, you can check the rate by holding down the
TOTAL/RATE key.
Reseting the total
If you press the RESET key, the PTX800D will set the total to zero and
clear any total alarms (you can disable this feature during setup for
greater security). There is also an external reset input that you can use
to clear the total remotely.
Reviewing the setup options
To review the setup (in read only mode) press the PGM key. The
PTX800D will show the software version number. Press the Å key to
see the next setting. The information in review mode is shown in the
same order as setup mode (some irrelevant items will be skipped).
There is a 10s timeout during review mode or you can press PGM again
to return the display to normal operation.
You can review the setup while the instrument is in service - the unit
will continue to operate normally. Setup mode
Changing the setup options
You should only use setup mode if you have to change a setting or
calibrate the outputs. The setup mode stops all operation. As soon as
you have setup the last parameter, the unit behaves as if it has been
switched on with the new settings. This does not mean that the total is
reset - you must do this yourself if necessary.
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GUIDE
If you want to abandon all the changes you have made, simply remove
the security link (or remove the power) before the save message is
shown.
To change the instrument setup:
1. Connect the security link (short pins 8 & 12).
2. Press the PGM key.
The setup sequence is shown in the table on page two.
Setup options
General
There are four basic areas of the instrument operation that must be
setup on a fully configured PTX800D. They are:
• Pulse/frequency inputs;
• Display and keypad operation;
• Alarms one and two (optional); and
• Analogue outputs (optional).
You can disable the alarms and/or analogue outputs if you do not
need them (so that their settings are skipped).
Software version
The information in this guide refers to versions 1.00 to 1.09.
Model
PTX series instruments all look identical from the front so this identifies
the intrument type.
Input signal type
Sets the input trigger and reset levels to suit the pulse source. The
table below gives the threshold values.
For contact closure inputs, the software incorporates debouncing
(minimum pulse width 20mS/maximum frequency 10Hz).
Input type
LOAC
HIAC
LOdC
HIdC
CoN
Pulse rate
Set the pulse rate to low if the maximum input frequency is below
1kHz. Otherwise it should be set to high.
Pulse scaling factor
Sets the number of pulses received for a unit change in the total. So, if
you have a flowmeter that gives four pulses per litre, you can show the
total in litres by setting the pulse scaling factor to four, or in kilolitres by
setting the pulse scaling factor to four thousand. You can not set it to
more than 10 000 display digits (i.e., ignoring the decimal point).
Total decimal point
The total decimal point position sets the number of decimal places for
the total display. Totals are displayed using the full eight digits.
Rate decimal point
Sets the number of decimal places for the rate display. Rates are
displayed as five digit numbers.
Rate scaling factor
The rate scaling factor sets the ratio between the total display and the
rate display. It must be a power of ten (i.e., 1000,100, ..., 0.01, or 0.001).
Number of samples
The PTX800D calculates the rate every 260mS. The analogue output
and display are then updated from the average over the programmed
number of samples. For example, if you set the number of samples to
10, the analogue output and rate display will be updated every 2.6s.
Low voltage inputs High voltage inputs
Trigger Reset Trigger Reset
50mV -50mV 200mV -400mV
2.5V -2.5V 14V -10V
3.5V 0.5V 20V -2V
6V 3V 35V 10V
6V 3V 35V 10V
PTX800D
Description
Low level AC signals
High level AC signals
Low level DC signals
High level DC signals
Contact closure