Emerson Liebert ICOM-DO Service Manual download pdf (Page 168)

iCOM

Control Training and Service Manual

How To Use The Schematics

As you look at the outside edge of the electrical schematic (drawing), you will see

the numbers 8 through 1 (reading left to right) across the top and bottom and the

letters D through A (reading from top to bottom) along both the left and right edges

of the schematic. These numbers and letters are called locators, just like on a

map. By intersecting the number and letter into the drawing, you can locate the

section of the schematic you need to reference.

The next area of interest is the line numbers along both sides of the schematic.

By using these line numbers and a straight edge, you can pinpoint a particular

item in the located section. Also, useful is the Nomenclature section along the

right side of the schematic. The nomenclature sections refers identifies the device

by abbreviation and name and indicates on which line the device is found.

If you look deep into the schematic, you can see that the transformer section is

laid out in a ladder progression making it easy to follow-out each circuit. You may

wish to highlight each circuit with a marker making it easy to follow.

The number indicators in the area to the right of the ladder circuit section are also

important. These are the contact locators for each relay or contactor shown on the

drawing. The number represents the line location of the contact(s) for the adjacent

shown relay or contactor. There are two types of line number indicators. One is

highlighted with a bar across the top of the number, this indicates a normally

closed contact. The other number shown without the bar indicates a normally

open contact. Remember that the drawing is shown in the non-powered (de-

energized) state.

These drawings are the latest revisions at publication of this manual and are what

Liebert calls Universal drawings. Liebert has included numerous options on each

one of these drawing to help in troubleshooting the system. These drawings may

or may not be on your particular unit.

It is important to become familiar with legend, nomenclature and notes on each

drawing.

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Emerson Liebert ICOM-DO Service Manual Page 168