Conair Carousel Plus D Series User Manual page 164

C - 2 l A p p e n d i x
Z e r o M e c h a n i c a l S t a t e ( Z M S )
CAUTION: Before performing maintenance or repairs on this product, you should disconnect
and lockout electrical power sources to prevent injury from unexpected energizing or start-
up.
During maintenance, it is essential that the system be put into a state which eliminates the
possibility of components making an unexpected and dangerous movement. This procedure
is typically referred to as lockout. After all energy sources have been neutralized, the system
is in the zero mechanical state (ZMS). This provides maximum protection against unexpected
mechanical movement.
The lockout procedure must include all energy sources:
• Electrical power supply
• Compressed air supply
• Hydraulic fluids under pressure
• Potential energy from suspended parts
• Energy in springs
• Any other source that might cause unexpected mechanical movement
The following is a recommended Zero Mechanical State procedure which must be followed
prior to any inspection, or maintenance of the Dryer Monitor hopper probe(s).
1
Turn off the loading device installed to the top of the drying hopper to assure that
it does not attempt to load the hopper with material.
2
Perform the proper shutdown sequence to the connected dryer or drying system
and allow all hopper components (internally and externally) to adequately cool.
3
Disconnect and lock out the primary electrical supply feeding the dryer.
4
Drain the drying hopper, at least to a level that fully exposes the probe; typically
just below the air spreader cone in the hopper, as observed through a sight glass or
viewing window.
5
Carefully open the drying hopper door and clarify that material level is below the
probe and that the temperature of all hopper surfaces and the probe are adequately
reduced to make touching and handling safe.
6
Use caution working in elevated areas and use approved fall prevention measures
and carefully disconnect the drying monitor probe from its junction box on the top
of the hopper.
7
The probe is now accessible for maintenance, replacement, adjustment or repairs.
WARNING: Before removing lockout devices and returning switches to the ON position,
make sure that all personnel are clear of the machine, tools have been removed, and all
safety guards reinstalled.