ABB AFPS-11C 3AFE68969972 POWER SUPPLY

The cam you select determines the operation of all contact blocks mounted to the operator. It is selected on the basis that it provides the simplest circuitry for the desired “X-O” diagram. The selection tables of the following page show all the “X-O” combinations. For the purpose of this example, the applicable portion of those charts is shown in Table 47-286.It becomes immediately obvious that cam 3 is the better choice for two reasons, (1) the series combination can be avoided making it simpler to wire, (2) only two contacts are required, which is less expensive than the three contacts required by cam 2.

Contact Block Selection. 

Having selected the cam, contact block selection is simply a matter of gathering the A position and B position circuits into pairs which make up the most convenient contact block arrangement. If there is an imbalance in the number of circuits under A or B, then single circuit blocks must be selected for these leftover circuits.

Selector Switch Operator.

 Lastly, you have to choose from the many types of operators — knob and lever in various colors or keyed. Also what combinations of maintained and spring return functions are required. Selection of these operators can be found on Page 47-180. For the above example you may want a 3-position maintained black knob, cam 3 — Catalog Number E34VHBK1.

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