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l I n t r o d u c t i o n
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
energization or start-up. A lockable device has been provided to isolate this prod-
uct from potentially hazardous electricity.
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 unexpect-
ed 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, adjustment or maintenance of the system.
1
If there is a remote control device, press the <STOP> key at that remote operator’s
control.
2
Press the <STOP> key at the local TrueBlend SB-4 control panel.
3
Disconnect and lock out the primary electrical supply feeding the TrueBlend SB-4
controller.
4
Disconnect and lock out the primary electrical supply feeding the material handling
system that is feeding the TrueBlend SB-4 material hoppers with process material.
5
Shut-off and lock out the primary compressed air supply that is feeding the
material handling devices.
Vent the compressed air supply lines.
6
On each TrueBlend SB-4, disconnect all of the cables leading to the motor of the
metering device. (Where applicable).
7
Drain any process material from the loading devices feeding the TrueBlend SB-4
material hoppers.
8
Lock out all energy sources which might cause unexpected movement of equip-
ment which is accessible through the discharge at the base of the TrueBlend SB-4
extruder hopper.
9
Test to verify that all energy sources have actually been disconnected and/or de-
energized.
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.
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Summary of Contents for TrueBlend SB-4
Page 6: ...iv l Table of Contents...
Page 38: ...3 10 l Installation...
Page 134: ...4 96 l Operation...
Page 160: ...6 10 l Troubleshooting...
Page 165: ...Appendix l C 2 Hole Locations for Blow Off Kit...
Page 168: ...D 3 l Appendix...