# Using the Monitors - Speeds window The Speeds tab displays the current speeds at the transmission input, transmission output, the turbine and the vehicle in real time.
| How to open Monitors - Speeds:
Select Service > Monitor 1 > Speeds in the main window. If there is communication with a connected transmission control unit, the current speeds are displayed automatically in real time. If communication with a transmission control unit is not possible, this will be indicated by a at the bottom right of the window: This message is also displayed when communication with a connected transmission control unit has been interrupted. For help in the event of communication problems, please refer to: Communication problems. Once you have eliminated the communication problems, click "Yes" if ALADIN is to re-establish communication with a transmission control unit. An existing communication is shown by the progress bar.
| The display of the speeds:
> The speeds are displayed with four dial instruments.
> Signal | Description |
> n1 | Speeds at the transmission input in rotations per minute. The speed is also displayed as a digital value. If a fault is detected at this speed sensor, "Error" will be displayed as a digital value. Perform an upload for selective troubleshooting. For further information, please see: Upload. |
> n2 | Speed at the transmission output in rotations per minute. The speed is also displayed as a digital value. If a fault is detected at this speed sensor, "Error" will be displayed as a digital value. Perform an upload for selective troubleshooting. For further information, please see: Upload. |
> n3 | Speed at the turbine in rotations per minute. The speed is also displayed as a digital value. If a fault is detected at this speed sensor, "Error" will be displayed as a digital value. Perform an upload for selective troubleshooting. For further information, please see: Upload. |
> Vehicle Speed | Vehicle speed in km/h. The speed is also displayed as a digital value in km/h. If a fault is detected at this speed sensor, "Error" will be displayed as a digital value. Perform an upload for selective troubleshooting. For further information, please see: Upload. |
| The general display in Monitors:
> The general display is shown in every tab. On top, there are four symbols for:
> Symbol | Description |
> | General transmission fault. |
> | General retarder fault. |
> | Transmission temperature too high. |
> | Retarder temperature too high. |
> Below, there is the real-time display of the following signals:
> Signal | Description |
> n1 | Engine speed / transmission input speed |
> n2 | Transmission output speed |
> n3 | Turbine speed |
> FP | Accelerator pedal position |
> BP | Brake pedal position |
> Time | Display of the sample time (for debugging tasks only) |
| Further topics:
More information on: Upload Up > Higher-level section © by Voith Turbo GmbH & Co. KG send remarks to joachim.ehleiter@voith.com (electronic department) or r.theilacker@voith.com (electronic department)