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ABB Low Voltage Industrial Products 0312
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Emergency stops
Why you need emergency stops
So that anyone is able to stop a machine during a
malfunction or if someone is in danger
How do I recognise an E-stop?
E-stop buttons shall according to relevant standards be red with
a yellow background. An emergency stop grab wire shall be red
for high visibility. A sign that indicates the location of the E-stop
shall be green with a white picture and possibly with text in the
local country's language.
How shall an E-stop stop the
machine?
An E-stop shall stop the machine as quickly as possible. To
obtain a quick stop one either removes the power directly or
one lets a frequency converter 'run down' and afterwards after
a little delay, remove the power. An E-stop shall not create other
hazards. Therefore a risk analysis must be made for the E-stop
to be correctly connected.
Requirements for E-stops are stated in the following standards and
regulations
2006/42/EC
The Machinery Directive
Clause 1.2.4.3 in Annex 1 gives requirements for the emergency
stop function for new machines). See also clause 1.2.2 Control
devices. (see chapter “Standard and Regulations”)
Council Directive 89/655/EEC
(with amendments)
concerning the minimum safety and health requirements for
the use of work equipment by workers at work
Clause 2.4 gives the requirements for the emergency stop
function for older machines. See also clause 2.1. (see chapter
“Standard and Regulations”)
EN ISO 13850 Safety of machinery - Emergency stop
Principles for design
A harmonized standard that gives technical specifications for the
requirements in the Machinery Directive. Could also be used for
older machinery.
EN 60204-1 Safety of Machinery - Electrical equipment of
machines – Part 1: General requirements.
Harmonized standard that gives requirements for the electrical
equipment of machinery including the emergency stop actua-
tor/function. Se clauses 9.2.2 and 9.2.5.4.2.