Difference between ground controls and platform controls

When you look at an aerial work platform, you will notice two separate sets of controls, organised in control boxes. One is located at the base of the machine (the ground controls), and the other is inside the work basket (the platform controls). While they share the goal of operating the machine, they are designed for different situations.

Note: We are keeping things simple here to explain the basics. In reality, many machines use extra modules and controllers alongside the upper and lower stations. The exact setup changes depending on the manufacturer, model and age of the machine.

Ground controls

The ground controls can be described as the primary controls, as without them, the platform controls cannot be used. They have multiple functions:

• Key switch: This is the master switch located on the ground station. It acts as the selector for who is in charge of the machine. The switch has three positions: Off, Ground, and Platform. This setup ensures that someone on the ground can always take over and override the platform controls.

• Emergency situations: The ground station is mainly used to rescue an operator if they become stuck or incapacitated at height.

• Maintenance & loading: These controls are also used to test functions before use or during a service, and to position the boom for transport when loading the machine onto a truck.

• Diagnostics port: On many modern control boxes, a service port is included to help with troubleshooting. Handheld tools or laptops are connected to this port so that error codes can be read and settings can be adjusted.

Platform controls

The upper control box is the interface used during an operator’s typical workday. It allows the operator to control the machine from the basket when the ground control key switch is set to ‘Platform’.

• Operation: This unit usually features a joystick to control the machine's primary movements, such as driving, steering, and lifting. On certain models, like smaller scissor lifts, this control box is removable. This allows the operator to stand on the ground while driving.

• Precision: Because the operator is in the basket, these controls allow for the precise positioning needed to reach a specific work area safely.

• Safety: Most platform joysticks include a ‘deadman’s switch’ or a trigger that must be held to allow any movement. This ensures that the operator is paying attention and that the machine doesn't move by accident.

Why are there differences between brands and models?

While the layout of a control box varies between brands like JLG, Genie, Haulotte, or Skyjack, the basic functions remain the same. Some manufacturers use buttons and toggle switches, while others use advanced joysticks. To help operators navigate these different designs, clear operational decals (stickers) must always be present to show exactly what each control does.

Because these functions look so similar, it is tempting to swap control boxes between machines. However, you should always keep a box with its original unit. Even if two boxes look identical, they often have different internal software or calibrations. Using the wrong box can cause unpredictable movement and serious safety risks. To stay safe and conform, always verify the OEM part number before moving a control box.