1128500
WPC 2000 User Manual
A-16
Extracts from OSHA and ANSI
The reset device shall be located outside of the
safeguarded area such that it cannot be
reached from within the safeguarded area.
Reset of the device or machine control shall not
occur until verification that the safeguarded area
is clear of individuals.
Key lock reset switches located at various
positions around the safeguarded area may be
one method of accomplishing this requirement.
8.3.2.4 Components, subassemblies or modules
of the interface or machine control system shall
meet the requirements of 6.1.
8.3.2.5 Muting of the device shall be permitted
during the non-hazardous portion of the
machine cycle. Muting of the device shall be
accomplished such that a single failure of a
component, a subassembly or a module of the
system / device that affects the performance of
the safety-related functions shall not prevent a
normal stop command from being initiated, or
shall cause an immediate stop command. In the
event of a failure, re-initiation of the machine
shall be prevented until the failure is corrected
or the system or device is manually reset.
E8.3.2.5 Muting is typically accomplished by
interface circuits or auxiliary controls. The
muting element should incorporate a similar
level of control reliability as the presence-
sensing device itself. A simple cam-operated
limit switch wired in parallel with the device's
output is inadequate, as its failure can remain
undetected.
In the presence of a failure, repetitive manual
reset of the system or device shall not be used
for production.
The intention of a manual reset is to encourage
the diagnosis of a failed component,
subassembly, device or module. A second
failure may occur during the diagnostic or
troubleshooting process, negating the safety
function(s). Additional safeguarding should be
used to protect individuals during this process.
See the definition for control reliability and
Annex C for further information.
If the machine has reversing capability where a
muting hazard is possible, the control system
shall include an automatic means so muting is
only permitted in the forward direction.
If an individual can pass through a sensing field
when the device is muted, means shall be
provided to ensure that the individual is outside
of the hazard area, or that the machine ceases
hazardous motion when the muting is removed.
One method of meeting this requirement is by
the use of a control circuit interlock on the drive
motor starter (forward direction contact) to allow
"muting" only in the forward direction when the
starter is energized. See 8.3.2.1
8.3.2.6 Bypassing of the device shall be capable
of being supervised by the user. Indication that
the device is active or bypassed shall be
provided and shall be readily observable by
individuals protected by the device.
E8.3.2.6 Care should be taken to ensure that
the operators and other individuals are aware
that the device has been bypassed so that
individuals do not assume that the device is
active and they are safeguarded when, in fact,
the device is bypassed.
When bypassed, the device, interface or control
system shall not indicate any state other than
"bypass."
An amber indicator lamp or other means may be
used to meet this requirement.
Extracts from ANSI B11.19-2003 8.3
Standards Requirements
Explanatory Information
Summary of Contents for wpc 2000
Page 91: ...1128500 WPC 2000 User Manual 2 64 Installation ...
Page 191: ...1128500 WPC 2000 User Manual 5 22 Troubleshooting ...
Page 209: ...1128500 WPC 2000 User Manual A 18 Extracts from OSHA and ANSI ...
Page 225: ...1128500 WPC 2000 User Manual G 6 Glossary ...
Page 231: ......
Page 232: ......
Page 233: ......
Page 234: ......
Page 235: ......
Page 236: ......
Page 237: ......
Page 238: ......
Page 239: ......
Page 240: ......
Page 241: ......
Page 242: ......
Page 243: ......
Page 244: ......
Page 245: ......
Page 246: ......
Page 247: ......
Page 248: ......
Page 249: ......
Page 250: ......