EDI 242L Operation Manual - Page 4

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Model 242L Operations Manual

The Model 242L handle assembly is made of GE Lexan

Type 121, which is a super durable

polycarbonate resin. The design of this assembly strengthens and protects the whole PCB assembly

much better than conventional metal face plates.

1.4 INSTALLATION AND ADJUSTMENTS

Installation of the unit consists of plugging into the appropriate slot of the Input File and connecting the

assigned inputs to the proper cabinet terminals. The edge connector is keyed to prevent incorrect

installation. Following power-up, a front panel LED test will illuminate both OUT indicators for two

seconds.

1.4.1 MINIMUM OUTPUT PULSE

If desired, the output pulse width for both channels can be set to 100 milliseconds minimum by installing

jumper "100ms" (J4-A).

1.4.2 INPUT POLARITY

The polarity of the input can be inverted such that a closed contact input is False and an open contact

input is True. The input polarity of Channel 1 can be set to invert by installing a jumper into the "CH1

POL" (J4-B). The input polarity of Channel 2 can be set to invert by installing a jumper into the "CH2

POL" (J4-C).

1.5 THEORY OF OPERATION

Reference designators shown are for Channel 1. Reference designators for Channel 2 are shown in

parenthesis.

1.5.1 SYSTEM DESCRIPTION

The sensor circuitry can be broken down into seven major blocks. Each "Input Circuit" block contains

the electrical transient devices and the input biasing circuit. Although the Model 242L has two DC

inputs, a single digital processing section is used to process both inputs.

The microcontroller unit "MCU" Block provides the input voltage threshold and input pulse width filtering

function on both channel 1 and channel 2 DC input circuits.

The MCU then controls the OUTPUT and DISPLAY blocks appropriately. The TEST switches can be

used to force the input to the True state. If the TEST switch is in the ON (locked) or MOM (momentary)

position it will force the output to the asserted (True) state regardless of the input circuit state. The

TEST switches are processed through the MCU for pulse width input and output requirements.

Valid output calls are made via optically isolated solid state transistors. Output calls are indicated on

the front panel by means of red LEDs labeled "OUT".

Eberle Design Inc.

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