DMEX Fueling Controls
There is (1) DMEX fueling module allocated per multi-product dispenser. The DMEX module eliminates the need for a switch-neutral breaker, freeing up space inside the electrical interior. It provides phase isolation and individual dispenser disconnect means.
Also included are pump contactors used to control the submersible pumps and provide E-stop functionality. Pump contactors interface with standard or variable-speed configurations.
Compliance: Ensure your facility stays compliant and meets NEC 514 (11) circuit disconnect requirements.
- 1 DMEX module per dispenser
- Start here for 120V control, reset, and pump-request issues
- Works alongside the LVDD module for the same dispenser
Actual DMEX module
Use the DMEX module as the first troubleshooting point for fueling enable, pump request, reset, and E-stop logic.
Typical DMEX control architecture
One DMEX module is allocated per multi-product dispenser. The DMEX interfaces with remote emergency shutdown, cashier control, tank monitoring, product select signals, and pump contactors.
Complete system terminal strip wiring
Use this view to trace dispenser signals, pump outputs, shutdown logic, and terminal-strip connections across the system.
DMEX board callouts
Quick visual identification of common field-service areas on the DMEX module.
DMEX quick checks
- Confirm the correct dispenser number first
- Check control power and terminal connections
- Verify hook signal changes when nozzle state changes
- Check shutdown / reset logic before moving to field wiring
- Trace relay output to the pump contactor