Milnor MWR12J5, Schematic/Electrical Parts, Page: 9 / 39

How to Use Milnor
®
Electrical Schematic Diagrams
PELLERIN MILNOR CORPORATION
BIUUUK01 (Published) Book specs- Dates: 20130308 / 20130308 / 20130308 Lang: ENG01 Applic: PCR UUU
How to Use Milnor
®
Electrical Schematic Diagrams
Milnor
®
electrical schematic manuals contain a table of contents/component list and a set of
schematic drawings. These documents are cross referenced and must be used together.
The table of contents/components list shows, for every component on every schematic in the
manual, the component item number (explained in detail below), statement of function, parent
schematic number, part number, description and electric box location. In older manuals, two
component lists are provided: List 1 sorts the components by function, and List 2 by type of
component. Newer schematic manuals include only the list sorted by component number.
The schematic drawings use symbols for each electromechanical component, and indicate the
function of each. Integrated circuits are not shown, but the function of each microprocessor input
and output is stated. Certain electrical components not pertinent to circuit logic, such as wire
connectors, are not represented on the schematic.
Most machines require several schematics to describe the complete control system and all the
options available on the included models. In most manuals there are some schematic pages that
don't apply to your specific machine because certain options and configurations are mutually
exclusive or are not necessary in all markets. You may find it helpful to mark or remove such
pages. A schematic page that only applies to a subset of machines will normally state, in the title,
which models and/or options it covers. Compare this with the nameplate on your machine and
with your purchase records.
Each schematic is devoted to circuits with common functions (e.g., microprocessor inputs, motor
contactors). Schematics appear in the manual in alphanumeric order.
1.
Component Prefix Classifications and Descriptions
Component item numbers consist of up to six characters and appear as part of a component's
symbol on the schematic. The first two characters indicate the general class of component, and
the remaining characters are a mnemonic for the function. For example, “CD” is the code for all
time delay relays, and “SR” stands for safety reset. Thus, CDSR is a time delay relay that serves
as a safety reset.
The following are descriptions of electrical components used in Milnor
®
machines. Descriptions
are in alphabetical order by the component class code (two character prefix).
Note 1:
Some component class codes do not have a corresponding symbol, but are represented by a box
and an accompanying note describing the component. Examples of such codes are BA (printed circuit
board), ED (electronic display), and ES (electronic power supply).
BA=Printed Circuit Board —Insulating substrate on which a thin pattern of copper conductors
has been formed to connect discrete electronic components also mounted on the board.
CB=Circuit Breaker ( Figure 1 ) —Automatic switch that opens an electric circuit in abnormal
current conditions (e.g., an overload).
Figure 1: Circuit Breaker (CB)
CD=Control, Time Delay Relay ( Figure 2 ) —A relay whose contacts switch only after a fixed
or adjustable delay, once voltage has been applied to its coil. The contacts switch back to
normal (de-energized state) immediately when the voltage is removed.
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