Different protective measures are required depending

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1110 16. Solutions 16.1 Solutions to exercises from Chapter 2 Exercise 2.1 Protective circuits for electro-mechanical limit switches Differentiation must be made between ohmic, inductive and capacitive loads. Depending on the type of load, a suitable protective circuit is to be designed in order to achieve a longer service life for the switching contacts. Ohmic load If the load is purely ohmic, no additional protective measures need to be taken to observe the limit values of the respective data sheet. Capacitive load A great amount of current flows briefly if a capacitive load is switched on. If this current exceeds the value specified in the data sheets, external measures must be taken to restrict it. A protective resistor is connected in series with the switch. The design of the protective circuit is in accordance with the formula R = V / Imax with switching voltage V and maximum switching current Imax. The resistance is to be selected so that it can accept the required electrical power. Inductive l...
View Full Document

Ask a homework question - tutors are online