Vega 1756 User Manual

1756 Octal Relay

Service Manual

1756 OCTAL RELAY

RELAY 1

RELAY 2

RELAY 3

RELAY 4

RELAY 5

RELAY 6

RELAY 7

RELAY 8

098-0354

Rev A.

2 Vega

TABLE OF CONTENTS

1. Forward ........................................2

2. General ........................................2

3. Installation ......................................3

4. Connections ....................................6

5. Operation.......................................8

6. Theory of operation ...............................8

Vega Fax Library ..................................10

Suggestions or Comments ..........................10

Warranty (Limited) .................................10

1756 Parts List....................................11

Specifications ....................................12

1. Forward

This manual is intended for use by experienced technicians familiar with similar types
of equipment. All the information required for installation, operation and servicing is
included.

The manual is divided into sections for easy reference. Each section, although related,
may be read independently without first reading the previous section. Any special
equipment will be included at the end of the manual.

2. General

The Vega Model 1756 Relay Card is a general purpose card that provides a reliable
means of remotely controlling a variety of customer specified devices. The card was
intentionally designed to be flexible, incorporating E point jumpers which allow the
user to operate the card without alteration, to perform various switching functions, or by
changing the jumper configuration, to allow for user defined special functions. It plugs
into a Tellabs, Type 10 or equivalent open frame rack and can be used in conjunction
with any remote control console.

2.1 Standard Features

2.2 Optional Features

"

Six double pole double throw relays, with direct wiring to the card edge connector
suitable for phone line pair switching.

"

Two double pole double throw relays, with one pole directly wired to the card
edge connector, capable of switching signals.

"

Front panel LED indicators that illuminate when the corresponding relay is
energized.

"

Low power input for active relay drive signals.

"

12 Vdcoperation.

"

Jumper selected switched high or switched low inputs.

"

Relays 5 and 6 can have one pole isolated from the card edge connector by
removal of 0 ohm resistor jumpers, and installing jumpers arranged for unique
switching operation.

"

Relays 7 and 8 have one pole connected to E-points for unique jumpers to provide
special operation.

"

Relays can be isolated and driven directly via E-point jumpers.

"

A universal circuit area, suitable for accommodating an ancillary user designed
function.

1756 Relay Board 3

3. Installation

Caution - ESD Sensitive

This piece of electronic equipment contains electronic components known to be
susceptible to Electro-Static Discharge (ESD). Precautions have been taken to avoid
the effects of ESD, however the user is encouraged to promote safe handling
techniques in the handling, storage and service of this equipment.

3.1 Introduction

The installation of the Octal Relay Card should be referred to experienced technicians
familiar with similar types of equipment. Only basic hand tools are required to remove
the card, change jumper settings as required, and for making connections of phone
lines, signals and power.

3.2 Installation

Read this section thoroughly before attempting to install the card. Exercise care in
order to prevent errors-wiring or damage to the equipment.

3.3 Inspection

Carefully unpack the equipment and inspect it thoroughly as soon as possible after
delivery. If any part of the equipment has been damaged in shipment, report the extent
of the damage to the Transportation Company immediately.

This unit has been inspected and adjusted to its recommended operation condition at
the factory. Unless it has been handled roughly in shipment or otherwise abused or
tampered with, it will require only connections to be wired for operation.

3.4 Mounting

The circuit card is intended for mounting in a Tellabs, Type 10 or equivalent open
frame rack. Care should be taken during installation to prevent locating the card in a
position adjacent to other equipment that generates high temperature or electromagnetic
radiation to avert erroneous operation. Always provide an appropriate service loop on
interconnecting cables.

3.5 Access for Installation/Servicing

When installing into a Tellabs, Type 10 or equivalent open frame rack, ensure the front
and rear of the rack have clear access for card installation and wiring.

To service, remove the 1756 from the rack or place on a circuit card extension for
access while troubleshooting.

3.6 Power

Primary power for the card is a regulated source of 12 V
power supply can be used, or the customer can supply their own for the unit.

. Either a Vega supplied

dc

4 Vega

1756 Relay Components