Required explanation of sub clause 7.2.101.2 (Exception) of IEC 61010-2-020:2006

Harsh

Involved In Discussions
#1
Hello There,

Can anyone briefly explain what the following first line from IEC 61010-2-020:2006 sub clause 7.2.101.2 means?

For LABORATORY CENTRIFUGES that satisfy all the following limitations, a device which merely interrupts motor power may be used instead of an interlock mechanism.

Is it referring to the limitation of using the interlock mechanism or what?

Thanks in advance.
 
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CharlieUK

Quite Involved in Discussions
#2
I don't have -2-020 in front of me, but my interpretation of that is:

An interlock mechanism is not required for LABORATORY CENTRIFUGES that satisfy all the following limitations - a device which merely interrupts motor power may be used instead

An "interlock" has to meet requirements of 61010-1 clause 15 and be fault tested against 61010-1 clause 4.4.2.13

(I suspect that the limitations include being lower mass/energy centrifuge)
 

Harsh

Involved In Discussions
#3
Thanks Charlie for the info. But the thing I am confused about is "a device which merely interrupts motor power may be used instead". What does it mean? Which kind of device.

Does it refers to the motorized interlock mechanism?
 

CharlieUK

Quite Involved in Discussions
#4
An interlock would prevent you opening the lid until the moving parts had stopped moving and would also prevent them from being powered on until the lid was closed

A device which " merely interrupts motor power " sounds like a switch that removes power from the motor when the lid is opened, but doesn't stop it rotating, so the centrifuge could still be spinning when the lid was opened.
The switch should also prevent the motor from re-starting until the lid is closed, but again, doesn't have to meet the more onerous requirements of an interlock
 

Harsh

Involved In Discussions
#5
So the latch/interlock mechanism is sufficient either mechanically or electrically operated. There is no need for the motorized interlock right?
 

CharlieUK

Quite Involved in Discussions
#6
My reading is that if the product meets all the limitations, it doesn't need an interlock that meets the requirements of EN 61010-1

Note: a device isn't an "interlock" if it doesn't meet the required functional reliability to be an interlock - in that case, it's just a switch
 
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