Mark,
You may want to check EN 418 'Functional Aspect of Machine Emergency Stop
Equipment.' In it, it does cover some of the constructional requirements
noted in your email.
Particularly,
4.4.1 The emergency stop actuators shall be designed for easy actuation by
the operator and others who may need to operate them. Types of actuators
that may be used include:
- mushroom-type push buttons;
- wires, ropes, bars;
- handles;
- in specific applications, foot-pedals without protective cover...
4.4.2 The emergency stop actuators shall be positioned for easy access and
for non-hazardous operation by the operator and others who may need to
operate them.
NOTE. Measures against inadvertent operation should not impair
accessibility.
Personal Comment: You may be interested in knowing that EN418 does not
either require or prohibit the use of a shroud/collar/guard. While some
standards (e.g. ANSI/RIA 15.06) specifically calls out 'unguarded'.
4.4.3 The emergency stop actuators shall be colored red. As far as a
background exists behind the actuator and as far as it is practicable, it
shall be colored yellow.
4.1.2 The control device and its actuator shall apply the principle of
positive mechanical action (see 3.5 of EN 292-2).
NOTE. A control switch with positive opening operation, is an example of a
suitable control device. According to EN 60947-5-1 (3rd part, subclause
2.2), positive opening operation (of a contact element) is ?the achievement
of contact separation as the direct result of a specified movement of the
switch actuator through non-resilient members (e.g., not dependent upon
springs)?.
Personal Comment: FYI. Some European testing laboratory interprets this as
requiring a dual contact EMO actuator.
Hope this helps!
TinBear
In a message dated 97-01-10 16:01:50 EST, [email protected] (markjc) writes:
<< I have a question concerning IEC 1010-1 section 6.12.2.3.
According to the standard, equipment whose function may give rise to a
hazard shall have an emergency switch...
Since my equipment has a hazard accessible in-order to operate properly
(i.e. it has an accessible part which goes up to 3200 Volts and 5 mA), I
need to have an emergency switch.
My question is that this standard doesn't give any more information
about this emergency switch. I am guessing that it has to be on the
front panel so it is always easily accessible. Will a standard Power
Switch on the front panel be acceptable? Is there a specific size
requirement? Is there a specific color requirement? Is there a specific
standard for this switch?
Any help would be greatly appreciated. >>
---------------------
Forwarded message:
From: [email protected] (markjc)
Sender: [email protected]
Reply-to: [email protected] (markjc)
To: [email protected]
List-Post: [email protected]
Date: 97-01-10 16:01:50 EST
I have a question concerning IEC 1010-1 section 6.12.2.3.
According to the standard, equipment whose function may give rise to a
hazard shall have an emergency switch...
Since my equipment has a hazard accessible in-order to operate properly
(i.e. it has an accessible part which goes up to 3200 Volts and 5 mA), I
need to have an emergency switch.
My question is that this standard doesn't give any more information
about this emergency switch. I am guessing that it has to be on the
front panel so it is always easily accessible. Will a standard Power
Switch on the front panel be acceptable? Is there a specific size
requirement? Is there a specific color requirement? Is there a specific
standard for this switch?
Any help would be greatly appreciated.
