Specifications

CONSTRUCTION
1. Speed monitor and capture mod-
ule. This module is used to monitor the
speed and store the data in a user-de-
fined file.
(a) The module first prompts for the
filename. The file name is entered with
an extension .DAT.
(b) The next entry is called ‘trigger
mode’. It specifies how the software should
start monitoring and capturing data. The
options are: 1 = manual and 2 = auto. If
option 1 is selected, the system waits for
a key press to start the monitoring and
capturing operation.
If option 2 (auto mode) is selected,
the system waits for the first pulse
from the proximity switch to start
monitoring and capturing of data.
(c) The next entry relates to ‘units’,
which has the following further op-
tions:
1 = Revolutions/min.
2 = Revolutions/sec.
3 = Revolutions/hr
(d) The next entry pertains to the
‘range of speed,’ which must be more
than the maximum speed that is ex-
pected. The options are:
1 = 400 units
2 = 800 units, etc
(e) The next entry concerns the ‘num-
ber of teeth’ and represents the number
of pulses from the proximity switch per
revolution.
After making the above entries, the
following message is displayed on the
monitor screen:
“Trigger mode: Auto (or Manual) Waiting
for first pulse (or Press any key to start)”
depending on the trigger mode. If manual
mode has been selected, then hit any key
to start. If auto mode is selected, the soft-
ware waits for the first pulse from the
proximity sensor to proceed. The display
then shows the speed in the units selected
and the capture file name. Pressing ESC
exits the monitor mode after closing the
capture file. Pressing any other key re-
turns to main menu.
2. Viewing a graph file. This mod-
ule is used to view an existing data file.
Sequential contents of a DEMO.DAT file
are shown in a box (using eight columns).
If a non-existant filename is entered, the
software detects the opening error and
prompts the user for re-entering the
filename. The various prompts for enter-
ing the required data are:
(a) File name – Enter the full filename
FILE Contents of DEMO.DAT
Showing Rev./min.
10 0 0 00 0 0
1500 00000
00 0 1500 0 0
00 0 3000 0 0
00 0 0 0150 0
0150 900150 0
0150 0 00 0 0
0 120 0 0 0 0 0 15
30 30 0 0 30 0 0 0
0 150 0 0 0 0 0 0
3000 000015
0300 0 00 0 0
00 0 0 00 0 0
01560 0 0150 0
30 150 0 0 0 0 0
00 0 0 0150
Fig. 4: Structural block diagram of software
HELPS.PG1 file contents
+++SPEED MASTER HELP PAGE+++
This software can be used to capture
and monitor the speed of any rotating
part for a maximum of eight minutes
with a total sampling time of two sec-
onds. The software has four menu lev-
els which can be selected from the Main
Menu.
In Capture/Monitor mode the soft-
ware has two trigger modes, viz,
Manual, which waits for a key press and
Auto, which waits for the first pulse from
the sensor.
The captured file can be viewed in
any X-axis scale. However, all points com-
ing out of the view page are clipped off.
When using the gear teeth for speed
calculation, please enter the teeth per
revolution to enable internal calculation
of speed to be made.
Enter the filename where the data
is to be stored, when prompted. The
same file can be viewed in the view page
option. If an invalid file name is entered,
or the file cannot be opened, an error is
displayed and the user can exit to Main.
...Press Any Key to Return to Main...
PARTS LIST
Semiconductors:
IC1 - 7805 regulator 5V
IC2 - MCT2E opto-coupler
Resistors (all ¼ watt, ± 5% metal/carbon
film, unless stated otherwise)
R1 - 300-ohm
R2 - 150-ohm
Capacitors:
C1 - 1000µF, 16V electrolytic
C2 - 0.22µF polyster
Miscellaneous:
X1 - 230V AC primary to 0-9,
250mA sec. transformer
BR-1A - Bridge rectifier, 1-amp.
S1 - Proximity switch (refer text)
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