Page 13 - MetalForming February 2010
P. 13
Facility: ____________________________ Date: __________________ Equipment Reviewed: ________________________________________ Performed By: ________________________ Title: __________________
Inspection Items
1) Verify that the light curtain is compatible with the type of machine which may be used with the light curtain (The machine on which the light curtain is installed must be capable of stopping motion anywhere in its stroke or cycle) ANSI B11.19-2003 §8.3.2.3
2) Verify the mounting distance of the light curtain is equal to or greater than the minimum safe distance from the point of hazardous operation. (See CFR §1910.217 and ANSI B11.19-2003)
3) Verify that all additional guarding devices, interlock switches, and mechanical barriers are installed and operating properly. Determine that all access to the danger point not protected by the light curtain is guarded by other means, such as gates, fencing, wire screening or other approved methods. (See ANSI B11.19-2003 § 8.3.2)
4) Verify that the light curtain can only be reset from a position outside and within the view of the hazardous machine area. Make sure the operator is not able to stand between the light curtain sensing field and the danger point of the machine. (See ANSI B11.19-2003 § 8.3.2.3)
5) Inspect the electrical connections between the guarded machine’s control circuitry and the light curtain. Verify that they are properly con- nected to the machine such that a stop signal from the light curtain results in an immediate halt at any point in the machine cycle or stroke. Inspect the electrical connections between the guarded machine’s control circuitry and the light curtain. (See ANSI B11.19- 2003 § 8.3.2.3)
Pass
Fail
N/A
I. Operational Test:
II. Functional Test:
6) Inspect the light curtain to ensure that the Auxiliary Relay is proper- ly configured for your installation. If the control wiring uses the auxil- iary relay, then press the Test/Store Button (if equipped). The machine controller should energize to verify the proper electrical connection of the relay to the machine controls. If the wiring does not use the auxil- iary relay, then simulate a light curtain fault condition by pressing the Test/Store Button. The light curtain should go into a SAFE MODE and the output relay.
7) Test the Machine Test Signal (MTS) feature by turning on the machine power. If the MTS feature is not used, proceed to step
• While cycling the machine, verify that the MTS only functions during a safe position of the machine cycle.
• Without interrupting the sensing field, observe that the red and yellow indicators will light and the output relays de-energize when the MTS circuit is open.
8) Test the Machines Primary Control Element (MPCE) feature by turn- ing on the machine power. If the monitoring feature is not used, pro- ceed to step 9.
• Activate the MPCE monitoring as appropriate for your light curtain. • Cycle the machine.
• Place a temporary jumper wire between the MPCE connections. • The light curtain should enter a fault condition.
• Remove the temporary wire.
• Reset the light curtain to recover from the fault.
9) Record the results in the machine log
Comments: __________________________________________________ ____________________________________________________________ ____________________________________________________________
Disclaimer: This log is not intended to serve as a comprehensive checkout procedure, but rather as a generic template to help employ- ers develop their own procedure logs. Employers must consult their instal- lation manual for instructions specific to their light curtains and the requirements for the machines on which the curtains are used. Keep a copy of the checkout log with the machine records. For the user’s con- venience, a “comments” section is included at the bottom of the check- list so that any items that may need to be corrected or further explored can be recorded.
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