2. Inhibiting muting from occurring
3. Reducing the chance of unauthorized or unintended bypassing or defeating of the safety system
6.2.5 Mute Lamp Output
The SX's display provides a visible indication that the safety device's safeguarding function is muted.
Under
Output Configuration
, select a Muting Lamp output. Configure one of the Output Signals as Muting Lamp 1 or 2. The
Muting Lamp 1 or 2 line will pulse on and off +24 V DC when the system is muted.
CAUTION:
•
Mute Status Must Be Readily Observable
•
Failure to follow these instructions could result in serious injury or death.
•
Indication that the safety device is muted should be provided and be readily observable. Failure of
this indication should be detectable and prevent the next mute, or the operation of the indicator
should be verified at suitable intervals.
6.2.6 Mute Time Limit (Backdoor Timer)
The Mute Time Limit (Backdoor Timer) allows the user to select a maximum period of time that muting is allowed to occur.
The Mute Time Limit can be set between 10 and 1080 minutes in 1 minute increments using the configuration software.
The timer begins when the second muting device makes the simultaneity requirement and allows a mute to continue for the
predetermined time. After the timer expires, the mute ends no matter what the signals from the mute devices indicate. An
Override can be performed to clear the obstruction (if configured). For no time limit (infinite time), select a time of 0 minutes.
Factory default setting
: 10 minutes
WARNING:
•
Selecting the Muting Time Limit (Backdoor Timer)
•
It is the user’s responsibility to ensure the Mute Time Limit (Backdoor Timer) setting does not
create a hazardous situation.
•
Select an infinite time for the backdoor timer (disabling) only if the possibility of an inappropriate or
unintended mute cycle is minimized, as determined and allowed by the machine’s risk
assessment.
6.2.7 Mute-Dependent Override
Overriding a safeguarding device is the manual interruption or suspension of the normal function of a safeguard under
supervisor control. Typically, an Override is needed to clear an object that is stuck within the SX's Safety Zone, such as in an
entry/exit application.
Overriding a safeguarding device should not be confused with muting, which is the temporary, automatic suspension of the
safeguarding function of a safeguarding device during a non-hazardous portion of the machine cycle. Muting allows for
material to be manually or automatically fed into a machine or process without issuing a stop command.
When Override (or Bypass) is used, the following precautions must be taken:
•
Prevent exposure to any hazards during an Override; supplemental safeguarding must be provided per ANSI B11.19,
ANSI/NFPA 79, IEC/EN 60204-1, and ISO 13849-1.
•
The means of overriding and visual indication must be provided and be readily observable from the location of the
safeguard.
•
The reset, actuation, clearing, or enabling of the safeguarding device must not initiate hazardous motion or create a
hazardous situation.
•
Standards require the use of spring return, hold-to-run, devise or secure momentary action push buttons, located so
that it will not be possible to enter the hazardous zone while maintaining the state of the devices.
The SX5 Override function can be configured to be initiated via different methods. In the stand-alone and master models, a
one terminal Single Line Pattern option can be chosen. In the master units with at least a 12-pin cable, a Single Line Pattern
using one terminal can be configured. You can also select a two-terminal configuration based on signal level or signal edges.
For either method, the Override switch(es) must be supervised and must prevent automatic operation. The single terminal
Single Line Pattern requires one normally closed (NC) switch conn24 V DC to the Override input pin. The dual
terminal level or edge configuration requires one normally open (NO) and normally closed (NC) switch conn24 V DC
to Override 1 and 2 input pins.
Note:
The switch connected to override 1 pin should be normally open. The switch connected to override 2
pin should be normally closed.
SX Safety Laser Scanner
70
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