IEC 60730 / IEC 60335 ('Class B') case study [TTb-23] скачать в хорошем качестве

IEC 60730 / IEC 60335 ('Class B') case study [TTb-23]

At heart, a domestic washing machine consists of powerful electric motor enclosed in a metal casing. As a normal part of the device operation, the electric motor is used to rotate a heavy metal drum at high speed. Access to this potentially-dangerous mechanism is controlled by a door with an electronic locking mechanism. The device is used in a domestic environment. There is a risk of injury if access is obtained to the drum while it is rotating. Such injuries could potentially be severe (including loss of a limb), or even life-threatening, particularly for a small child. The device is connected to a pressurised water supply. The drum is filled with water as a normal part of its operation. There is a risk of flooding if the door is opened at the wrong time: we will assume that this is a ‘nuisance issue’ (rather than a safety issue). However, a combination of water and an electrical supply must always be treated with caution. In this video, we explore (in outline) the development of a controller for use in such a washing machine. The controller will be developed in compliance with international safety standards IEC 60730 / IEC 60335 (at ‘Class B’). This is Video 23 (out of 28) from our popular TTb course: https://www.safetty.net/training/ttb_...