Noise monitor mounted next to the hooter??

Light sensor mounted next to the flasher?? ■

30 seconds at a minimum is the normal time and you can contact conveyor dynamics or continental conveyor to obtain instruction or a service call for installation of the timer and control override in case of alarm/horn/siren failure. ■

Dear Mr S GANESH

We are developing simillar system for One of steel plants.

We are going to offer one system which will take input from hooter sound and o/p will be given to PLC as stat ENABLE signal

Pl contact us

regards

RAVI PARALE

DIRECTOR-PROJECTS-TECHNICAL

PROTOCONTROL INSTRUMENTS ( I ) PVT LTD.

EL31/1 MIDC BHOSARI PUNE 411026

MAHARASHTRA

INDIA

PH : 0091-20-27125197,

0091-20-27125198

0091-20-32947007,

0091-20-32324545

FAX: 0091-20-27123918

MOB:0091-9370149559

SKYPE: ravi.61

MAIL: ravi.parale@protocontrol.com

protocontrol@vsnl.com

raviparale@rediffmail.com

Web: www.protocontrol.com

Special: UDYOG SHREE AWARD 2007

■

Originally Posted by sganesh

Please bear with me for repeating this thread. Request some one may help me to plug the serious safety loop hole of conveyor operation.

Thanks & regards,

Greetings and salutations SGanesh,

=========================================================

Mr. Nordell and Mr. Dos Santos can explain it directly how they are wired etc. if you contact them;

The mine where I worked had the- hooters/klaxon horns/sirens/flashers wired directly to the control box that held the circuit breakers, PLC, and belt timers and the emergency stop circuit at each transfer point where the belt drive unit was located,this wiring was also tied into the main control system/plant.

Prior to the belt being energized there screen plant operator/control system operator announced the starting of the conveyor.

The conveyor belt was energized and prior to the belt starting the warning buzzer/horn etc. was turned on for 30 seconds and then the belt started up.

The same thing happened if an emergency stop pull cord was pulled to stop the conveyor at any point, when the circuit was disconnected it required the belt timers and warning horns to repeat the start up sequence prior to that belts starting.

Depending upon where the emergency stop was pulled to stop a belt, that belt and the belts behind it stopped and the belts above it remained running as the circuit operating those belts was not broken.

When the e-stop was reset the horns activated for 30 seconds on that section of belt and any sections behind it, then that belt started and thirty seconds after that the belt behind it started and so on until all the belts were running behind the one that was stopped.

The Hubble conveyor belt and Continental conveyor control boxes were required to have all the wiring and timers for the e-stops, sirens, flashers etc.

The folks at www.cemanet.com have all the wiring and safety regulations as well.

lzaharis ■

Originally Posted by sganesh

Dear Mr.lzaharis,

Thanks for your reply. I want to establish that in case of malfunction/absence of hooters/flashers/sirens , the conveyor should not start. Have anyone ensured this?

I tried to explore the www.cemanet.com But there is only one page. I could not proceed further.

Rgds,

Sganesh- the only way to guarantee a belt will not start is if the electrical power switch to that belt drive is physically locked with a padlock and or a multiple lock lock out clamp for more than one lock.

This is a mandatory item here in the United States, canada, Australia, and in Europe by following the updated national electrical codes, MSHA regulations and the regulating bodies in europe, australia, and New Zealand regulating mining

The electrical switch controlling the belt at the drive unit and the control center should and must be equipped with a lockout function to physically disconnect the electricity from the conveyor drive unit. this includes the emegency stop pull cords as well.

Square D, hubble, seimens and general electric, sumitomo, kawasaki, eaton cutler hammer and others have all the available items for sale.

If you do not have this type of electrical lock out system it will require new control switches and circuit breakers and most likely all new wiring.

Please look at the united states department of interior web site and the MSHA site located there to see the regulations for control of electrical circuits for conveyors..

The square D, general electric, sumitomo, siemens and Hubble home pages for electrical equipment will describe this in detail for you and catalogs are available

by mail and have world wide distribution. ■