P Alm Button Assembly - Rockford Fosgate SSC-500 Installation Manual

PALM BUTTON ASSEMBLY (continued)
The two "run" palm buttons, on hydraulic machines, can be used to initiate a machine cycle and as a method of safeguarding the point of operation.
ANSI's B11.2 has established certain requirements for these buttons when used as a safeguarding method. According to ANSI B11.2 - 1995, the
total stopping time of the press should include the total response time of the control system and the time it takes the press to cease slide motion.
The following formula should be used when calculating the safety distance:
D s = K (T s + T c + T r + T spm ) where:
D s = minimum safety distance between the device
and the nearest point-of-operation hazard (inches)
K = the hand speed constant = 63 inches/second.
T s = the stop time of the machine tool measured at the
final control element
T c = the response time of the control system.
Note: T s + T c are usually measured by a portable or built-in
stop-time measuring device.
T r = response time of any hand control device, if provided,
including its interface
T spm = the additional time allowed for the stopping performance
monitor to compensate for variations in the normal stopping time
When applying the two palm "run" buttons to meet the requirements for a "point-of-operation safeguarding
device," make certain these buttons are located on the machine so they meet the minimum safety distance
required by the ANSI formula.
Simply stated, safety distance is the mounting and location of the palm buttons at a distance where the operator
cannot reach into the point-of-operation hazard before the ram has stopped or completed its downward travel.
To obtain the stopping time, a portable stop-time measurement unit can be used. (For a portable unit, please
contact Rockford Systems, LLC)
Red Emergency-Stop Palm Button (Required)
Photo 3.8
Rockford Systems, LLC
Call: 1-800-922-7533
SECTION 3 — INSTALLATION OF COMPONENTS
The red emergency-stop button is used to stop the machine anywhere in its cycle. When the operator depresses
the button, it should stop the hazardous motion of the machine immediately by shutting off the hydraulic drive pump
motor. This palm button assembly includes a double hub mounting box. It can be located between the two "run"
palm buttons as part of the operator's control station. (Please refer to page 18.) This button has a mechanical latch
that must be reset after depressing the button.
Note: More than one emergency-stop button may be furnished for additional control stations or for convenience.
SSC-500 Hydraulic Press Solid-State Control
(Continued on next page.)
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