RIDGID metal detector User's Guide download pdf (Page 104)

Operating Instructions

Setting reject times is best done by passing the product, contaminated by a detectable metal

test sample, through the machine and the adjusting the delay (time or distance from detect to

reject) and dwell (time or distance the reject device operates for) to obtain a clean removal of

the contaminated product from the transport into the reject collection device. All units of time

are in seconds.

For systems where a Product Registration Photo-eye is not being used, the reject delay time

is the time in seconds between when a contaminant is detected in a product to when the

reject device is activated to remove it from the production line.

The position of the contaminant within the product (length) will directly affect the reject delay.

You must therefore make allowances in the delay time to ensure that wherever the

contaminant is located in the product a clean rejection is achieved.

For systems where a Product Registration Photo-eye is used, reject delay timing is always

timed from when the leading edge of the product activates the photo-eye regardless of where

in the product the metal contamination is situated.

When using variable speed systems, the delay is timed by distance which is entered in metres

in the Reject delay field. See the Menus > Service > Configuration > System menu to view

the available speed mode options.

Enter the reject delay time in seconds, or for variable speed systems, enter the distance in

metres.

■ Reject dwell

Reject dwell is the time or distance that the reject device operates for to remove a

contaminated product from the conveyor belt and into the reject collection device. It must

therefore be set to ensure clean removal of the contaminated product.

Please read through the information contained in the Reject delay section above for further

guidance. Reject timings may also be set in the Menus > Service > Reject > Set Up menu.

Enter the reject dwell time in seconds, or for variable speed systems, enter the distance in

metres.

■ PVS Test

Select this option if you are using the Performance Validation System to carry out product

testing at specific times and have configured this in the Menus > Set Up > PV Test Set Up

menu. You can also access the PVS Log to view the test details.

Learning Products

An essential part of inspecting products is to set up the metal detector parameters specifically for

each product to optimise the detectors performance for each one. Loma metal detectors provide a

Learn feature which automates this process.

The Learn settings and the process to be followed is defined in the Menus > Learn > Set Up

and

Menus > Service > Configuration > Learn Limits menus.

Note that the Menus > Learn > Set Up menu is only available if the Set Up Learn option has been

enabled in the Menus > Service > Options menu.

The metal detector provides three alternative Learn processes:

■ Full Learn

This process must be carried out initially on all products as it automatically configures and

populates the system settings and parameters based on effect of the product on the

electromagnetic field as the product passes through the inspection aperture.

The product samples used for the Learn process must be free of metal contaminants and fully

representative of the normal products to be inspected.

Following a Full Learn, any manual adjustment to the settings for a product can be accessed

through the Menus > Learn > Set Up menu. See the Full Learn

section for further details.

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RIDGID metal detector User's Guide Page 104

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