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7
CONNECTIONS & CONFIGURATION SWITCH SET-UPS FOR VARIOUS SENSOR OUTPUTS
1.
SENSOR SUPPLY VOLTAGE AND CURRENT
The +12 V sensor supply voltage on the
“+12 VDC”
Terminal is nominal
with ±25% variation due to line and internal load variations. All RLC sensors
will accommodate this variation.
2.
HI/LO FRQ. SELECTION
The HI/LO FRQ Selection switch must be set on LO FRQ when switch
contacts are used to generate count input signals. Since the LO FRQ mode
also provides very high immunity against electrical noise pickup, it is
recommended that this mode also be used, whenever possible, with
electronic sensor outputs, as added insurance. The LO FRQ mode can be
used with any type of sensor output, provided the count pulse widths never
decrease below 5 milliseconds, and the count rate does not exceed 100 Hz.
3. V
IL
and V
IH
levels given are nominal values ±10%, when the counter voltage
at the
“+12 VDC”
Terminal, is +12 VDC. These nominal values will vary in
proportion to the variations in
“+12 VDC”
Terminal voltage, caused by line
voltage and load changes.
4. When shielded cable is used, the shield should be connected to COMM. at
the counter and left unconnected at sensor end.
NOTES:
INSTALLATION ENVIRONMENT
The unit should be installed in a location that does not exceed the
maximum operating temperature and provides good air circulation. Placing
the unit near devices that generate excessive heat should be avoided.
The bezel should be cleaned only with a soft cloth and neutral soap
product. Do NOT use solvents.
Continuous exposure to direct sunlight may accelerate the aging process of
the bezel.
Do not use tools of any kind (screwdrivers, pens, pencils, etc.) to operate
the keypad of the unit.
Installation
The Libra counters meet NEMA 4/IP65 requirements for indoor use, when
properly installed. The units are intended to be mounted into an enclosed
panel with a gasket to provide a water-tight seal. Two mounting clips and
screws are provided for easy installation. Consideration should be given to the
thickness of the panel. A panel that is too thin may distort and not provide a
water-tight seal.
(Recommended minimum panel thickness is 1/8" {3.2 mm}.)
After the panel cut-out has been completed and deburred, carefully apply
the gasket to the panel.
DO NOT APPLY THE ADHESIVE SIDE OF THE
GASKET TO THE COUNTER BEZEL
. Insert the unit into the panel. As
depicted in the drawing
(at right)
, install the screws into the narrow end of the
mounting clips. Thread the screws into the clips until the pointed end just
protrudes through the other side. Install each of the two mounting clips by
inserting the wide lip of the clips
into the front end of the hole,
located on either side of the case.
Then snap the clip onto the case.
Tighten the screws evenly to
apply uniform compression, thus
providing a water-tight seal.
Caution:
Only
minimum
pressure is required to seal
panel. Do
NOT
overtighten
mounting screws.
NOTE: IF EXTERNAL SUPPLY IS USED TO POWER
CMOS CIRCUIT, VOLTAGE MUST BE EQUAL TO
OR GREATER THAN DC OUT VOLTAGE.
NOTE: CIRCUIT SHOWN FOR STD, TTL OUTPUT. TTL
CIRCUITS ARE AVAILABLE WITH OPEN COLLECTOR
OUTPUTS ELIMINATING NEED FOR DIODE CLAMP.
COUNT SWITCH OR ISOLATED TRANSISTOR OUTPUTS
SENSORS WITH -EF
SENSORS WITH CURRENT SINK
CURRENT SOURCE CONNECTED
CURRENT SINK CONNECTED
OUTPUT CURRENT SRC. CONN.
OUTPUT (NPN O.C.)
(COUNT ON OPENING)
(COUNT ON CLOSING)
(COUNT ON FALLING EDGE)
(COUNT ON TURN-ON)
TWO WIRE PROXIMITY SENSORS
INTERFACING WITH CMOS CIRCUITRY
INTERFACING WITH TTL
SENSORS WITH CURRENT SOURCE
CURRENT SOURCE CONNECTED
(B TYPE)
OUTPUT (PNP O.C.)
(COUNT ON CURRENT FALL)
(COUNT ON TURN-OFF)
RLC SENSOR MODELS: PR & RR PHOTO-ELECTRICS
RLC SENSOR MODELS: LMP-EC
RLC SENSOR MODELS: ASTC, LMPC, LSC, PSAC,
RPGB, RPGC, RPGH
LIBC-j.QXD 10/26/04 10:52 AM Page B7
