EDI 244L Betriebshandbuch - Seite 4
Blättern Sie online oder laden Sie pdf Betriebshandbuch für Industrielle Elektrik EDI 244L herunter. EDI 244L 8 Seiten. Dc isolator unit
Seite drucken1.1 GLOSSARY
A - Ampere
o
C - Celsius
Component - Any electrical or electronic device
DC - Direct Current
Firmware – Program code embedded into a microcontroller unit
Hz - Hertz
IC - Integrated Circuit
Jumper
- A means
of connecting/disconnecting two
or more conductive
by
soldering/desoldering a conductive wire or by PCB post jumper
LED - Light Emitting Diode
LOGIC - Negative Logic Convention (Ground True) State
mA - milliAmpere
ms - millisecond
MCU - Micro Controller Unit or microcontroller unit
MOV - Metal Oxide Varistor
Opto-coupler – An integrated circuit that provides electrical isolation
PCB - Printed Circuit Board
RMS - Root-Mean-Square
s – second
Schmitt Circuit – a circuit that provides hysterisis in the threshold
SW – Switch
uF - microfarad
VAC - Voltage Alternating Current
VDC - Voltage Direct Current
1.2 GENERAL DESCRIPTION
The Model 242L is a dual channel DC Isolator unit designed to meet Caltrans specifications
TEES 2009 including Errata #2 (December 2014). The Model 244L is a quad channel DC
Isolator unit in a half-width form factor. These isolator units occupy one position of a 33X
style standard input file. The isolator unit card incorporates a double-sided 44 pin edge
connector for the connection of power, input, and output signals. Each channel has individual
front panel controls for testing the operational mode, and high intensity front panel LEDs
which are used to indicate the output state. Outputs are optically-isolated solid-state
transistors. The Model 242L and 244L are powered from the 24VDC Cabinet Power Supply
and do not require AC Line.
While the Model 244L is interchangeable with the Model 242L, note that the Model 244L can
only be installed in the even numbered slots of a standard Input Assembly. The Model 244L
half-width form factor is primarily intended for use in rack assemblies designed for double
density (four channel half-width) detector/isolator units.
1.3 GENERAL CHARACTERISTICS
Each channel of the Model 242L/244L provides input hysterisis and digital filtering to qualify
the input signal. An input signal must meet the minimum pulse requirements specified in
section 1.7.4 in order to produce a valid output. The output pulse width for both channels can
be set to 100 milliseconds minimum by installing jumper "100ms" (J4-A).
Both the input and output circuits have been designed for maximum protection from electrical
transients. The inputs have been designed to withstand the discharge of a 10 uF capacitor
charged to +/- 1000 Vdc directly across the input pins, and a discharge of a 10 uF capacitor
charged to +/- 2000 Vdc applied through a source impedance of 5 ohms across the input
pins or to Equipment Ground. The outputs are protected by a transient clamp diode.
Eberle Design Inc.
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