Traffic Signal Controller Compatibility Guide
Before ordering signal heads, confirm how the controller switches each output, the operating voltage, wiring method and any countdown or communication interface.
Start with these six project details
Send the information below with the inquiry. It allows the signal head, power supply, countdown display and controller output to be reviewed as one system.
| Item to confirm | Typical options | Why it matters |
|---|---|---|
| Operating voltage | AC 85–265 V, AC 220 V, DC 12 V, DC 24 V | The signal module and controller output must use compatible voltage. |
| Output method | Relay contact, triac, transistor, dry contact | Different output devices have different leakage-current and load requirements. |
| Common wiring | Common neutral, common positive, common negative | Incorrect common wiring can prevent correct switching or damage components. |
| Signal arrangement | Red/yellow/green ball, arrow, pedestrian, bicycle | The controller needs one suitable channel for each required indication. |
| Countdown mode | Learning, trigger, communication, independent timing | The countdown display must match the controller timing source. |
| Local standard | EN 12368, project specification, national requirement | Photometric, electrical and housing requirements may differ by market. |
Match voltage before anything else
The voltage printed on the signal module must agree with the controller output and the site power design. Do not assume that a controller described as “220 V” can directly operate a low-voltage DC signal. A suitable power supply or isolated interface may be required.
Best practice: provide a controller wiring diagram or a clear photo of its output terminal labels before production begins.
Check low-load and leakage-current behavior
LED signal modules consume less power than incandescent lamps. Some electronic controller outputs may allow a small leakage current when switched off. This can cause faint glowing, unstable operation or false fault detection. The controller manufacturer should confirm its minimum load and off-state leakage specification.
Confirm the countdown interface
Countdown displays are not universally interchangeable. Common solutions include signal-learning countdown, independent trigger inputs and communication-based timing. The correct choice depends on the controller sequence, phase transitions and whether the display must blank during special operating modes.
- Provide the required countdown color and digit height.
- Confirm whether the timer follows red, green or both phases.
- State the maximum timing range and transition behavior.
- For communication control, provide the protocol and interface specification.
Wiring review checklist
- Mark every controller terminal and its rated output voltage.
- List each signal indication connected to that terminal.
- Confirm the common conductor arrangement.
- Check cable core count, conductor size and installation distance.
- Confirm grounding, surge protection and cabinet protection.
- Approve the final connection drawing before shipment.
Information to send for a configuration review
For a faster technical reply, send the project country, required standard, junction drawing, controller model, terminal diagram, signal size, indication type, voltage, quantity and delivery destination.
Request a Controller Compatibility Review