8.3 Push-button 8.3.1 General characteristics Single-button versions are used. These differ as regards the number and functionality of the contacts: - switch - deviator (single- or two-pole) 8.3.2 Electrical symbol Normally-closed switch Normally-open switch Deviator 8.3.3 Checking for efficiency DOES NOT POWER THE APPLIANCE OR DOES NOT PERFORM THE SPECIFIC FUNCTION: - Use a tester to check for correct closure (or aperture) of the various contacts. - Press the button and check for switching of the contacts. IMPOSSIBLE TO ACTION THE BUTTON - Check that the spindle is not broken and that there are no other mechanical problems (friction/breakage of couplings to cross-member).
SOI/DT 2002-05 eb 62 599 35 23-17