Observe the following safety instructions when doing any maintenance work on the crane with tandem control system:

─     Switch off the mains switch. Secure the switch to ensure it cannot be turned back on accidentally.

─     Unplug the mains disconnector plug from the socket on the crane panel. Secure the socket with a padlock to ensure it is not plugged back in accidentally.

─     Use suitable lifting platforms and fall protection equipment.

─     Adequately cordon off the operating range around the lifting platform.

─     Switch off any other cranes using the same crane track or cranes working above or below the crane undergoing maintenance. Secure the switch so that it cannot be unintentionally switched back on. Otherwise, other cranes could overturn the hoisting platform or crash into the crane undergoing maintenance.

─     Notify personnel in the area that maintenance work will be performed.

─     Only trained electricians should work on the crane electrical system!

─     Even after the emergency stop button has been pressed, life-threatening high voltages are still present in the panels.

These safety instructions apply specifically to the tandem control system:

─     If a load is transported by two cranes with a tandem control system, there is a risk that a breakdown of one crane will not be detected immediately. The diagonal pull could cause the load to fall, killing or injuring people.

Cranes with a tandem control system must be serviced particularly carefully.