Mine Health and Safety Act, 1996 (Act No. 29 of 1996)

Regulations

Guideline for a Mandatory Code of Practice

Safe Use of Conveyor Belt Installations for the Transportation of Mineral, Material or Personnel

Annexures

Annexure B: Minimum Performance Standards

Conveyor System Protection Devices

Take-up over-travel
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Over-travel limit switches can be placed at the far extremes of the counterweight or take-up device travel.

 

Comment:

Use of over-travel limit switches is considered good practice even for section conveyors, but the use thereof for section conveyors may be omitted if justified in terms of the risk assessment.

 

In a gravity counterweight take-up, the top over-travel switch trip may suggest a jammed conveyor fabric condition.

 

A bottom over-travel switch may indicate belt stretch, or a broken belt fabric flight.  Excessive take-up motion during starting and stopping indicates an inadequate or malfunctioning drive control.

 

Alternatively, excessive travel could indicate that one or more splices are failing or have failed.