ASTEC Peterson 6710D, Руководство по безопасности оператора

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Limit Switches
The anvil housing is fitted with a limit switch
(Figure 13) that trips if an overload has lifted the anvil
to a particular height. This switch is called the IRS limit
switch. For more information, see “IRS Limit Switch”
on page 23.
Also, two limit switches (Figure 14 on page 24) located
near the pivot shaft of the anvil housing detect excessive
movement of the shaft. If either of these two switches is
tripped, the feed system briefly reverses, then the engine
shuts down.
IRS Limit Switch
A limit switch installed at the air bag detects excessive
upward movement of the anvil housing.
Figure 13: IRS Limit Switch
When the IRS limit switch trips due to an excessive
upward movement of the anvil housing, the control sys-
tem:
• Signals the feed system to stop, reverse briefly, and
then stop. Feed may be moved in reverse.
• Signals the engine to slow to idle speed, which
slows the rotor.
• Displays an error message on the control panel
screen.
Also see “Recovering from a Feed Auto Shutdown” on
page 76.
Note: A large impact in the grinding area may trigger
additional protective responses by other compo-
nents, such as clutch disengagement or engine
shut down.
To prevent work slowdowns due to the IRS limit switch
being tripped too often, the limit switch may be disabled
in the control system display. However, none of the
above-listed protections are provided when the IRS
switch is disabled.
To check or change the IRS switch setting, see
“Machine Status (Home)” on page 95.
Compression Bumpers and Shear
Pins
Urethane compression bumpers (Figure 14 on page 24)
help prevent mechanical damage to the pivot shaft and
shaft bearings when a large, non-grindable object enters
the feed. They do this by allowing the pivot shaft to
absorb impact shocks.
During grinding, shocks are continually absorbed by the
bumpers, which allow the pivot shaft to move slightly in
the cushion box, reducing damage to the shaft bearings.
However, very large shocks that over-compress the
bumpers can then break one or both of the shear pins
(one at each end of the shaft). If a non-grindable object
causes a shear pin to break, shut down the machine and
inspect it for damage.
F09910