Rotational speed range chart

Who it’s for

Maintenance engineers, machine operators, and plant supervisors ask “how long has this motor been in each speed band over the shift or day?” They need a chart that shows not just current speed but the time spent in each zone.

What it does

A device reporting rotationalSpeed = 1200 RPM renders a time-series area chart overlaid on horizontal color bands: blue for Low (below 500 RPM), green for Normal (500–1500 RPM), orange for Elevated (1500–3000 RPM), and red for High (above 3000 RPM). The chart background is divided into these zones so operators can instantly see which operating band the speed occupies at any point in time. A data zoom slider lets operators examine any sub-period in detail.

• Color-banded area chart shows speed trend against operating zone boundaries simultaneously
• Data zoom slider lets operators focus on any time window — a full shift, a speed ramp, or a specific overspeed event
• Shows one asset’s data per widget; add multiple widgets to monitor different motors or drives side by side

How to set up

Data keys

Key	Role	Type	Description
rotationalSpeed	Chart series	Timeseries	Rotational speed in RPM; change the key name to match your device’s telemetry key

The widget ships with a simulated function datasource key labeled Rotational speed, so it draws random values until you point the datasource at a device and rename the key.

To point it at your own device: open the dashboard in edit mode, open the widget’s Datasources, pick the entity or entity alias, and replace the function key with the key your device reports.

Value ranges

Range (RPM)	Level	Color
0–500	Low	Blue
500–1500	Normal	Green
1500–3000	Elevated	Orange
3000+	High	Red

How to customize

• To change the operating thresholds — open the widget settings and adjust the band boundaries to match your machine’s rated speed range.
• To change the band colors — edit the color for each operating band in the widget settings.
• To rename the units label — change the Units field in the widget settings if needed.

Tips

• Use the data zoom slider to isolate a speed ramp-up sequence and verify that the machine passed through each band in the expected time — slow ramps can indicate mechanical friction or drive faults.
• A line that repeatedly spikes into the Elevated band during normal operation is a sign of process load variations or drive instability — zoom in to correlate with production events.
• Pair with a vibration range chart on the same row to identify RPM ranges where vibration increases, which can indicate resonance conditions that should be avoided in future speed profiles.