Supermarket Specification Upgrade Kits

Our supermarket failsafe specification kit has been specifically designed to be fitted to conveyor based metal detectors, checkweighers and x-ray systems in the food industry.

The reason for such a system is simply as follows:
To make sure that contaminated and or lightweight products are successfully rejected into their allocated reject bins.

To act as a failsafe mechanism against the possibility of a reject bin being so full that rejected product cannot enter into the allocated bin.

To also act as a failsafe mechanism in the case of low air supply to the reject device causing non rejection of the product.

In the case of all of the above the conveyor belt will stop, an alarm will sound and a visual coloured lamp will operate indicating which of the failsafe functions have failed.
In addition the system has a failsafe reset / test key switch which is used to reset or test a failsafe function.

Failsafe Operational Procedures
Normal Operation
When the GREEN LAMP is on and all of the other lamps are off this indicates that the system is ok to run and there are no failsafe functions in operation.

Orange Lamp On (Bin Full)
The conveyor belt has stopped and the orange lamp is on indicating that one of the bins is full of product or the photo eye across the bin is blocked.
Action –

a) Clear the system conveyor belts of any product.
b) Check the reject bins and remove any product (inform QA)
c) Reset the system by turning the key switch and start the conveyors.

Red Lamp on (Reject Confirm failure)
The conveyor has stopped and the red lamp is on indicating that a rejected pack has not passed through the photo eye at the entrance to the bin and may still be on the conveyor.

Action –

a) Clear the system conveyor belts of any product (inform QA)
b) Reset the system by turning the key switch and start the conveyors.

Blue Lamp is on (Low Air)
The system has stopped and the blue lamp is on indicating that the reject device does not have enough air supplied to it in order to complete a reject action.

Action –

a) Clear the system conveyor belts of any product (inform QA)
b) Check the air supply to the system is ok, if not inform supervisor.
b) Reset the system by turning the key switch and start the conveyors.

Testing the failsafe system
Although every effort has been made to make the system as reliable as possible it is recommended that the failsafe system should in itself be tested periodically. For example this is usually at the start of a shift or production run and is as follows:

1) Bin Full Test – Block the bin full photo eye for approx 30 seconds and the orange lamp should illuminate and stop the conveyor belt. If this does not happen then inform the supervisor.

2) Reject Confirm – Pass a metal contaminated pack and turn the keyswitch towards the test position. This will disable the reject and therefore not allow the pack to break the beam of the reject confirm photo eye. This should illuminate the red lamp and stop the conveyor belt. If this does not happen then inform the supervisor.

3) Low Air – Turn the air supply to the system off and the blue lamp should illuminate and stop the conveyor belt. If this does not happen then inform the supervisor.