5.0 Emergency Shutdown
a. Equipment has “emergency machine off” (EMO) circuit and the equipment is placed into a safe shutdown condition after the EMO button is depressed. Not required if equipment is rated 2.4 kVA or less and hazards are only electrical in nature.
b. No other new hazard is generated to personnel or the facility if the EMO is activated.
c. Activation of the EMO de-energizes all hazardous voltage and all power greater than 240 volt-amps in the equipment beyond the main power enclosure. Exception for safety related devices and computer interfaces.
d. EMO circuit does not include features that are intended to allow it to be defeated or bypassed.
e. EMO consists of electromechanical components.
f. Resetting the EMO does not re-energize circuits, equipment, or subassemblies.
g. EMO circuit shuts down the equipment by de-energizing rather than energizing control components.
h. EMO circuit requires manual re-setting so that power cannot be restored automatically.
I. EMO button is red and mushroom-shaped. There is a yellow background behind the button. No other device on the system should look similar to an EMO button.
j. EMO buttons are clearly marked as “EMO” or “Emergency Off”, and be visible from the viewing location. Label on button or the yellow background.
k. EMO buttons are readily accessible from operating and maintenance locations.
l. EMO buttons are placed where there is no more than 10 feet of travel from any operator or maintenance location.
m. EMO button is located or guarded to prevent accidental activation.
n. EMO activation can be done with the heel of the palm.
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发表于 2013-7-31 21:25
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发表于 2013-8-9 09:03