168
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AVAILABLE IN 4 or 6-DIGIT VERSIONS
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COUNT INPUT PROGRAMMABLE FOR ALL STANDARD
SENSORS & FOR COUNT SWITCHES
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RESET ON POWER-UP
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TWO COMPLEMENTARY SOLID-STATE OUTPUTS
1. Primary output to drive control relay
2. Auxiliary output (inverted) for external circuitry.
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CONTROL INPUTS FOR:
1. Remote Reset
2. Count Inhibit
3. Up/Down Count Direction
4. Display Blanking for Battery Backup
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PROGRAMMABLE RESET-TO-ZERO (RTZ) OR RESET-TO-
PRESET (RTP) ACTION, EACH WITH 4 RESET CYCLE MODES
DESCRIPTION
This high-performance presettable counter is based on solid-state technology
proven in tens of thousands of field applications, and incorporates features that
have made it an industry standard. With dual complementary outputs, input
configuration programmability, selectable reset cycle modes and a full
complement of control inputs, the Model SCD can handle practically any
application for single level preset counting.
The Model SCD features two selectable counting actions. With RTZ
(Reset-
to-Zero)
action, the counter resets to zero and counts up, actuating the outputs
when it reaches the preset value. When RTP
(Reset-to-Preset)
action is selected,
the counter is loaded with the preset number at the start of a cycle and counts
down to activate the outputs when the count reaches zero.
The preset value entered on the thumbwheel switches is loaded at the end of
a cycle
(when the outputs are active)
and during reset time. This prevents
inadvertent changes in the preset number once a run has started and also avoids
accidental over-runs that can occur with counters that allow
“setting-on-the-
fly”
.
Electrical connections are made to terminal strips on the rear of the unit.
These pressure clamp screw terminals accept stripped wires up to #12 AWG and
do not require lugs.
* -
See SC Series Sensor Input Connections & Input Configuration Switch Set-
up, Note 1 or “Applications” Section of the Catalog.
SPECIFICATIONS
1.
PRIMARY SUPPLY VOLTAGE:
Available in two voltage ranges, 50/60
Hz
(See Ordering Information)
. Allowable voltage variation ±10%. Input
power 11.2 VA. Also operates from +12 VDC Supply
(See Application
Notes)
.
2.*
SENSOR OUTPUT POWER (TERM.”A”):
+12 VDC ±15% @ 100 mA.
3.
RESET & PRESET TIMING PARAMETERS:
A.
COUNT-AFTER-RESET - With RTZ action new counts can be accepted
75 µsec after reset. With RTP action new counts can be accepted 1 msec
after reset.
B.
Preset loading occurs on timed output or reset.
4.
OUTPUTS:
SNK OUT
- Primary output
(current sinking)
to drive control relay, 100 mA
max. This output goes low when preset count (RTZ) or zero count (RTP)
is reached.
SRC OUT
- Aux. Output
(inverted)
operates synchronously with
“SNK
OUT”
to d12 VDC @ 10 mA.
5.
CURRENT DRAIN FROM BATTERY BACKUP:
60 mA with displays
blanked and without sensor or output loads. 350 mA
(6-digit)
, 260 mA
(4-
digit)
with full display on
(all 8’s)
but less sensor and output load.
6.
OPERATING TEMPERATURE RANGE:
-20
o
to +50
o
C
7.
CONSTRUCTION:
Steel Case, Aluminum Bezel, Aluminum Front Panel
with Polycarbonate Overlay, Black Epoxy Paint Finish.
8.
WEIGHT:
2.0 lbs (0.91 Kg)
MODEL SCD -
10 KHZ PRESETTABLE COUNTER WITH 0.43” (11 MM) L.E.D. DISPLAY
BULLETIN NO. SCD-C
DRAWING NO. LP0029
REVISED 1/99
DIMENSIONS “In inches (mm)”
Summary of Contents for CUB 1
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