Mold-Masters Hot Runner - Energy Forms and Lockout Guidelines

3.5.2 Energy Forms and Lockout Guidelines
Table 3-3 Energy Forms, Energy Sources and General Lockout Guidelines
Energy Form Energy Source Lockout Guidelines
Electrical Energy • Power transmission lines
• Machine power cords
• Motors
• Solenoids
• Capacitors
(stored electrical energy)
• Turn o󰀨 power at machine rst
(i.e., at point of operation switch),
and then at the main disconnect
switch for the machine.
• Lock and tag the main
disconnect switch.
• Fully discharge all capacitative
systems (e.g., cycle machine
to drain power from capacitors)
according to the manufacturer’s
instructions.
Hydraulic Energy • Hydraulic systems
(e.g., hydraulic presses, rams,
cylinders, hammers)
• Shut o󰀨, lock (with chains, built-
in lockout devices, or lockout
attachments) and tag valves.
• Bleed o󰀨 and blank lines as
necessary.
Pneumatic Energy • Pneumatic systems
(e.g.,lines, pressure reservoirs,
accumulators, air surge tanks,
rams, cylinders)
• Shut o󰀨, lock (with chains, built-
in lockout devices, or lockout
attachments) and tag valves.
• Bleed o󰀨 excess air.
• If pressure cannot be relieved,
block any possible movement of
machinery.
Kinetic Energy
(Energy of a moving
object or materials.
Moving object may be
powered or coasting)
• Blades
• Flywheels
• Materials in supply lines
• Stop and block machine parts
(e.g. stop ywheels and ensure
that they do not recycle).
Review entire cycle of
mechanical motion and ensure
that all motions are stopped.
• Block material from moving into
area of work.
• Blank as required.
Potential Energy
(Stored energy that
an object has the
potential to release
due to its position)
• Springs
(e.g., in air brake cylinders)
• Actuators
• Counterweights
• Raised loads
• Top or movable part of a press
or lifting device
• If possible, lower all suspended
parts and loads to the lowest
(rest) position.
• Block parts that might be moved
by gravity.
• Release or block spring energy.
Thermal Energy • Supply lines
• Storage tanks and vessels
• Shut o󰀨, lock (with chains, built-
in lockout devices, or lockout
attachments) and tag valves.
• Bleed o󰀨 excess liquids or gases.
• Blank lines as necessary.
3-11SAFETY
Hot Runner User Manual
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