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1
-3 Principles of Operation (continued)
Lockout
Unauthorized front panel changes can be
prevented by entering a user selected, four digit
code, in the "Lockout" mode. The status of the
unit can be observed but "LOCK ON" appears if
changes are attempted. Entering the code again
returns the unit to "LOCK OFF" status.
Scaled Pulse Output
The scaled pulse output corresponds to NET total.
The unit gives one pulse out for each positive
factored count. The output pulse duration is
selectable by choosing one of the following
frequencies: 20000, 2000, 200, 10. (see table
below)
Speed (Hz)
10
200
2000 200000
Min. ON/OFF (mSec) 47.5
2.0
0.2
0.013
NOTE: In the event where the unit counts down
(Input A signal momentarily lost), there will not
be any pulses present at Terminal 2. The output
pulses will be stored in an internal buffer. The
buffer will hold up to 10,000 pulses. The display
will show "DATALOST" if this buffer is filled.
When normal operation resumes and the counter
begins to count up, the output will remain OFF
until the amount of "up" counts equals the
amount of pulses in the buffer.
Analog Output (Optional)
The Analog Output option is controlled by an
Open Collector transistor; it gives a 4 to 20mA (or
0-20mA) output which corresponds to predefined
net rate or net total readings. In the Setup mode
the user is prompted to set the low and high (4
to 20 mA) values and also decide if the analog
signal will correspond to the ratemeter or
totalizer. The output for values below the "low"
setting will be 4 mA (0 mA). Compliance voltage
3 to 24 VDC. The output for values above the
"high" setting will be 20 mA.
A sinking driver generates a linear current across
the user's external device (such as a strip chart
recorder, PLC, computer, external meter, etc).
The Unit can supply the 24 VDC to power the
current loop. (Connect pin 15 to 13, Pin 16 is now
+24 VDC with respect to pin 12.) Connect Pin 16
to the + DC side of the external device and
connect Pin 3 to -DC side of the external device.
Outcard (Optional)
RS232 or RS422 serial two-way communication is
available. Up to 15 units can be linked together
in parallel and addressed separately to transmit
unit status or accept new set points in the
standard ASCII format. Baud rates of 300, 600,
1200, 2400, 4800 or 9600 as well as choice of odd,
even, space, or mark parity can be selected by
keypad control. Special OptoMux® compatible
RS422M is also available (See Section 8-12).
1-4 Specifications
Housing:
High impact plastic case with NEMA 4X front
panel.
Dimensions:
Reference Figure 1-1
Display:
8 Digit, 0.55" High, 15 Segment, Red Orange,
LED.
Input Power:
A: 110 VAC
±
15% or 12 to 27 VDC
B: 220 VAC
±
15% or 12 to 27 VDC
Current:
Maximum 280 mA DC or 5.3 VA at rated AC
voltage.
Output Power:
(On AC powered units only): +12 VDC at 100 mA.
Separate Isolated 12 VDC at 100 mA to allow
±
12
VDC or +24 VDC, regulated
±
5% worst case.
Temperature:
Operating:
+32
°
F (0
°
C) to +130
°
F (+54
°
C)
Storage:
-40
°
F (-40
°
C) to +200
°
F (+93
°
C)
Summary of Contents for KEPtrol F/C
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