RS V9275 Hoja De Instrucciones página 4

V9275
Totalizing Counter
Trouble-free reliable counting performance will only be assured if the
notes in these instructions are read carefully and precisely adhered to.
Applications
Pneumatic totalizing counters are used for counting operations of all
sorts. They can be used, for example, to count numbers of items or
parts, numbers of events, or for counting the individual steps in a
programme sequence.
The counter counts pulses of compressed air, which must lie within the
respectively specified range of pressure and limits of count frequency.
The display runs from 000 000 to 999 999 (six digits).
Installation
These pneumatic totalizing counters are intended to be built into the
front panel of the equipment.
Panel cut-out: __________________________________52 x 27mm
Distance between holes: ______________________38mm (centres)
Fastened by means of two countersunk M4 screws, supplied.
Note: Please take care to see that the panel cut-out is large enough
and that the counter is not placed under any mechanical tension
or strain when built in.
Pneumatic Connections
All totalizing counters are provided with rapid-fit push-in connections.
The inputs Z (input for the count pulses) and Y (input for the reset
pulses) are on the rear of the counter.
The compressed-air pulses and the reset pulses can be generated by
any of the following means:
Mechanically operated valves
Manually operated valves
Pneumatically operated valves
Electrically operated valves
Sensors
General pneumatic signals of any sort, provided they remain within
the specified pressure and pulse frequency ranges.
Counter functioning
The incoming pneumatic pulses are totalized by the counter. Each
compressed air pulse causes the actuator arm of the "units" figure-
wheel to move through the first half of a digit step onwards, and at the
same time tensions a spring which, as the pneumatic pressure falls off
at the end of the pulse, then pushes the "units" figure-wheel on for the
remaining half of the digit step to completion.
Any pulse length greater than the specified minimum of 8ms suffices to
give reliable operation; the interval between pulses can be indefinitely
long.
Resetting
These counters can be reset by either pressing the mechanical reset
button or by applying a reset pneumatic pulse to input "Y".
Note: The reset operation should only be carried out while there is no
air pulse present at the "Z" input. Any pulses which are received
while the reset operation is being carried out will not be counted,
and are lost.
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Technical Data
RS Stock No.
Medium: ______________Filtered compressed air, containing no oil
Pressure Range:
726-314, 726-336
Functions: ______________________________Counts and displays
Construction: ____________________________Mechanical counter,
Fastening:______________________Two through holes for M4 bolts
Orientation When Fitted: ________________________________Any
Display: ____________________6-digit, digits 2 x 4mm, white/black
Count Range: ________________________0 to 999 999, totalizing
Reset:
Connectors:__________________Rapid fit connector with i/d 1.5mm
Pulse Length: ________________________________8ms minimum
Interval length: ______________________________10ms minimum
Reset Conditions:
- pressure 2 to 8 bar
- pulse length 180ms minimum
- interval between the end of the reset pulse and the beginning
Temperature Range: ____________________________0° to +60°C
Faults
All dimensions, technical data and other notes represent production
conditions and the state of our knowledge at the time of printing. The
functional characteristics of the counters relate to the counter in new
condition, normal operating conditions (+15° to +25°C, non-corrosive
environment and chemically neutral compressed air).
Applications
Pneumatic preset counters are used for controlling and monitoring
operating sequences capable of being expressed as numbers in
pneumatic circuits, systems or equipment.
After the counter has counted the preset number of pneumatic pulses,
which can represent a number of items or a number of operating
cycles, it emits a pneumatic output signal which is used to start the next
following process or operation.
The preset valve can be selected anywhere between 1 and 99 999.
Installation
Panel cut-out: ______________________________52mm x 52mm
Hole Separation (centres): ____________________________63mm
Fastened by means of two countersunk screws (supplied), M4 thread.
Note: Please check that the panel cut-out is large enough, and that the
Working principle
The pneumatic preset counter consists of a mechanical drive system,
a mechanical system of digit wheels, and a pneumatic limit switch. The
count pulses for the counter are pneumatic (compressed air) pulses
which come from a pulse source. The connection Z is used to feed the
compressed air pulses onto the piston of the drive system. The rod of
this piston operates a C-piece which is in loose contact with the
actuating rocker, which it operates. Each compressed air pulse causes
the actuating rocker to move the "units" digit wheel by one-half of a digit
and at the same time to tension a spring, which during the period of low
pressure after the pulse, moves the digit wheel the remaining half-step
onwards.
Output signal
The output signal is given when air pressure is applied to connection P,
the preset count has been reached, and the reset is not actuated.
On connection A the output signal stands till the counter is reset by
pushbutton or pneumatically.
Note: The output signal A from the counter cannot be used directly to
________________________________2 to 8 bar
____________________________Pushbutton or pneumatic
of the next count pulse must be 50ms minimum
counter, when built in, is free of any mechanical tensions or
strains.
reset the counter (reset input Y).
driven by compressed air