Check that the following are working:
This check must be recorded by the operator or responsible person in the Shredder/Grinder Maintenance Log. Any failures that cannot be rectified by the operator must be reported to the department manager or other designated responsible person. Unsafe or faulty equipment must not be used and where there are multiple users, appropriate signage and means to lock out should be employed to prevent its use.
Source: MaintainX (Community Member)