PSDI – Presence Sensing Device initiation
What is the world is this!!!!!
Over the years you may have heard this term and never really understood its meaning or even knew what type of products complied or where even available. The following will enlighten and perhaps educate you to the point where you can introduce it to your customers.
The orgins go back to OSHO and its stand on PSDI for presses, a very difficult standard to meet and one I will not further discuss. But the most recent safety standard on PSDI resides in ANSI/RIA15.06-1999, yes some 7 years old now. Please review the following standard.
10.9.2 Presence sensing device initiation (PSDI)
PSDI is the mode of operation when PSSD still acts as a safeguarding device, but it is also used in a control configuration such that PSSD interruptions are monitored so that the control initiates a cycle start when the sensing field is clear without the need of pressing any additional cycle enable or run buttons.
The following additional requirements shall be met when a presence safety device is used to signal a start action in addition to its safeguarding function:
a)PSDI shall be used for production operations only. Setup, teaching, and maintenance shall not be done in the PSDI mode;
b)a configuration which would allow a person to enter, pass through towards the hazardous area and become clear of the PSSD’s sensing field shall not be used in a PSDI mode of operation;
c)PSDI shall comply with the following:
1) selection of PSDI shall require a separate and deliberate act;
2) a timer shall be provided to deactivate PSDI should there be a delay between production initiations;
3) part in place sensing shall be used, such that the part/work piece is in-place in order for PSDI to operate;
4) PSDI shall provide safeguarding on one plane only, mirrors shall not be used;
5) PSDI light curtains used for PSDI operation shall have a minimum object sensitivity not to exceed 30mm. Where light curtain object sensitivity is user-adjustable, either discretely or continuously, design features shall limit the minimum object sensitivity adjustment not to exceed 30mm. If fixed blanking is used, then the blanked area shall be completely obstructed. Floating blanking shall not be used if the minimum object sensitivity exceeds 30mm is such use;
6) When the PSSD signals a safety stop command for safeguarding purposes, a manual or conscious act shall be required to reinitiate the robot system sysle.
d)all other access to the hazard shall be prevented or safeguarded with additional PSSD’s that are not operating in PSDI
Leuze/Lumiflex, has several solutions to address your customers requirement to increase productivity, reduce repetitive trauma injuries and use enhanced technology for competitive reasons. The Compact Plus with Initiation is an excellent choice to start with and with the Safety Lab Software the numbers of cycle breaks before initiation can be increased from two to six. Leuze’s Safety Interface Module MSI-mi or MSI-mix will allow the Compact, Solid 4E, ECO or Solid 2 to serve as PSDIs. These are great products, for more info www.leuze.com
In order to get things started you still need Rees “Low Force” Palm Buttons, with an actuating force of under 2 lbs, the weight of your hand actuates the switch. I recommend the
04957- _ _ _ series. The this products and other great Rees products www.reesinc.com
For application assistance, literature, etc…. Please contact me @ office,cell or email.
Industrial Safety Sales, Inc.
PO Box 126 4112 Sheridan Rd. Kenosha, WI 53141
262-652-8660 fax262-652-1388 cell414-719-4771
www.industrialsafetysales.com